Bearings design guide - Polygon Composites · Bearings design guide. IntroductIon 3-10 Polygon’s company history and product manufacturing divisions. Product InformatIon 11-24 Polylube®

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Bearings design guide

IntroductIon 3-10Polygon’s company history and product manufacturing divisions.

Product InformatIon 11-24

Polylube® mrP bearIngs 11-12A superb bearing material for agriculture, construction and material handling applications requiring good load capacity, low frictional values, and superior wear characteristics.

Polylube® eWs bearIngs 13-14A composite bearing for applications that require high load capacity and low frictional values. Capable of going extended periods without maintenance.

Polylube® glass taPe bearIngs 15-16 An excellent solution for bearing applications where stick/slip is of concern.

Polylube® Ifr backed bearIngs 17-18A bearing with optimized structure for resistance to applications with fatigue conditions.

Polylube® HIgH temPerature bearIngs 19-20A bearing designed for environments over 425˚F or where thermal expansion stability is critical.

Polylube® guIde rod bearIngs 21-26A guide rod bearing for pneumatic cylinder applications where corrosion, high misalignment or edge loading, low friction and excellent wear characteristics are desired.

bearIng desIgn PrIncIPles 27-33

standard sIze cHarts 34-46



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TaBle of conTenTsVersatile high load, low friction composite bearings.

PHONE 800.918.9261 wEbsitE polygoncomposites.com 02

About our CompAnyPolygon Company was founded in 1949 by a chemist working on advanced com-posite materials during World War II at the U.S. Wright-Patterson Air Force base, and has since grown into an engineered materials company with multiple manu-facturing facilities and global distribution and sales offices around the world.

Polygon’s original patents for composite self-lubricating bearings in the mid 1960’s stand as a hallmark in the development of journal bearing technology. Since that time, Polygon’s ongoing research and development activities have resulted in multiple patents on innovative self-lubricating products as well as proprietary manufacturing capabilities that allow Polygon to project superior value in the journal bearing marketplace.

Corporate research and development activities, including an in-house bearing test laboratory and Idea Center engine, are located in the company’s corporate offices and primary manufacturing location in Walkerton, Indiana (approximately 90 miles east of Chicago, Illinois).

polygon’s DivisionsFour Distinct ProDuct Divisions:• Medical – composite surgical tubing for minimally invasive procedures.

• Bearing – greaseless composite bearings.

• Cylinder – composite hydraulic and pneumatic cylinder barrels.

• Electrical – double insulation for hand-held power tools, electrical and power distribution.



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inTroducTionVersatile high load, low friction composite bearings.


First Facility circa 1949.

First Continuous Fiber Process

Today's Indiana Plant

Polygon is an international supplier with manufacturing in the USA and China plus distributors throughout Europe and Asia. We have done business in over 50 countries worldwide and are always looking to expand.

WhAt is A Composite beAring?PolyLube® bearings use continuous fiberglass filaments incorporated into a propri-etary epoxy resin matrix for a very high strength bearing that is naturally concentric with no seam or overlap. This high strength laminate construction allows for a thin wall (1/16" to 1/8") bearing, reducing the size and weight of the assembly. The resulting bearing exhibits a very low coefficient of friction coupled with high load-bearing capacity.

polylube liner DesignPolyLube bearings utilize a proprietary design that ensures the anti-friction lining is locked into the composite material with more than a simple adhesion effect. This proprietary design also drives excellent resistance to impact fatigue and cavitation problems.

The differences in liner construction can be seen most dramatically during three periods: first, how coefficient of friction and wear change during the break-in period, second, how the bearing handles contamination in a dirty or unsealed environment, and third, long term bearing life. Differences in liner construction can also impact performance in the following areas:

• Coefficient of Friction—The required breakaway torque & startup forces required.

• Impact Fatigue—How the bearing handles shock or impact loading.

• Amount of Wear—The orientation of the PTFE in relation to the mating surface as well as the content of the PTFE will impact the amount of wear the finished journal bearing will exhibit.

• Time for Achieving Sufficient PTFE Film Transfer—The liner construction will impact the length of time as well as the operating conditions required to have the PTFE film properly transfer from the inner diameter of the bearing to the outer diameter of the mating surface.

Although not required, a dry lubricant can be used at installation to improve performance during the break-in period.



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PTFE fabric is used in the entire liner of the bearing, where it is incorporated into the resin structure as shown in this detail view below.

PolyLube provides a high percentage of available solid PTFE for a lifetime of dry pin lubrication.

Polygon is the largest purchaser of PTFE fabrics in the world.

The PTFE fabric layer is reinforced by a fiber and epoxy resin composite backing.

go greAseless!PolyLube® bearings not only exhibit excellent load capacities, low frictional values and resistance to corrosion, they also allow for true self-lubrication.

WhAt Are the DesireD ChArACteristiCs of JournAl/plAne beAring mAteriAls?In general, journal/plane bearing materials should have the following characteristicsin order for the bearing assembly to be properly designed:



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“The PTFE super-filaments

used in the bearing wear surface

exhibit tensile strengths 20 times

greater than traditional PTFE resins.”

1. truly self-Lubricating. Many materials claim to offer some level of self-lubrica-tion; however, many (especially sintered metal structures) lose their self-lubrica-tion properties quickly during operation. When the lubrication fails, metal-on-metal contact results. Premature bearing failure generally quickly follows.

2. contamination resistance. The contamination is allowed to deflect the lower modulus bearings and eventually work its way out of the joint without damaging the pin.

3. Pv rating. The PV rating should be easy to understand, and fit most application environments with a good match between the bearing pressure and surface velocity capabilities.

4. Quick transfer of PtFE Film to Pin. The key to self-lubricating bearings is the rapid transfer of PTFE from the bearing ID to the pin surface during the initial break-in phase. The film of PTFE on the pin functions as a dry lubricant, which reduces the friction and wear rate.

5. Fiber orientation to Minimize Friction. In a properly designed self-lubricating bearing, the bearing will exhibit a low coefficient of friction when the contact surface is on the ends of the PTFE fibers.

6. High Percent of PtFE near the surface. It is not sufficient to simply have PTFE fibers on the wear surface. A high percent of PTFE is desirable near the surface of the bearing to provide an ample amount of dry lubricant for wear and friction reduction.

0 2 4 6 8 10 30 40 50 60 70

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Filled PTFEs and Unfilled Polyethylenes

Molded Nylons and Acetals

Single or Multi-Lubricated Filled Molded Composites

Sintered Iron-Bronze

Metal Backed, Plastic Lined Greased Bearings

30% Reinforced Thermoplastics

Metal Backed

PolyLube® MRP

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Molded Nylons and Acetals

Single or Multi-Lubricated Filled Molded Composites

Sintered Iron-Bronze

Metal Backed, Plastic Lined Greased Bearings

30% Reinforced Thermoplastics

Metal Backed

KEY

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Filled PTFEs and Unfilled Polyethylenes

PolyLube® MRP

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Journal bearIng statIc loads Journal bearIng dynamIc loads

10,000

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30,000

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CastBronze

PorousBronze

AlloyedBronze

Steel-BackedBronze

HardenedSteel

ZincAluminum

Fabric-ReinforcedPhenolic

ReinforcedTeflon

POLYLUBE®

REQUIRES LUBRICATION

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greased Versus greaseless Journal bearIng comParIsons

WhAt “Composites professionAls” meAns to you!Polygon is the only organization with composite self-lubricating bearings as a primary product focus. Other bearing companies only see this product line as a necessary offering to satisfy the OEM market.

This family of materials is our core competency at Polygon. We hold the first patents on composite bearing design. We have the experience to better predict the performance of this type of bearing, can better define what factors drive product performance, and have a strong manufacturing infrastructure to support your busi-ness needs. Our abilities to specify sizing, assembly, and design parameters are unmatched in the composite bearing industry. Why? Because it is core to what we do. The value to you? Polygon Company has the best designed, highest performing bearing material available, at the best cost in the industry.

polylube® loWers totAl Cost of operAtion (tCo)A design engineer must continually search out materials that increase performance capabilities while reducing total product life costs. How does PolyLube® lower total cost of operation?

Poor lubricant maintenance is one of the most common failure points for bearings. A properly sealed and lubricated bearing should result in trouble-free field service in theory. Unfortunately, this is rarely the case. Greased joints may not be maintained properly, resulting in boundary/mixed lubrication condition and diminished bearing life. Bearings are often greased only twice in their life, once by the OEM and once before they are sent back for the warranty claim due to bearing failure from lack of lubrication. The following items can be eliminated with a truly greaseless bearing:



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The environmental issues around grease are only now coming to light. With self-lubrication all environmental contaminants are eliminated

Self-lubricating bearings eliminate secondary pin and housing fabrication required for greased bearings.

“Many materials claim to offer

some level of self-lubrication;

however, many lose their

self-lubrication properties quickly

during operation.”

• Grease Zerks

• Grease pathways in pins or castings

• Grease costs

• Labor cost for scheduled greasing

total cost of oWnersHIP analysIs

COST

FAC

TOR

GREASED BEARINGS POLYLUBE® GREASELESS BEARINGS

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OWNERSHIP

polylube® loWers totAl Cost of operAtion (tCo) – ContinueDThe total cost of ownership for a bearing that must be lubricated is greater than the total cost of a self-lubricating composite bearing. Most OEM’s clients have found that the cost of purchasing, assembling, and maintaining a greased bear-ing joint is at a minimum 1.5 times to a maximum of 4 times the cost of a self-lubricating bearing joint. Equipment rental yards are increasingly sensitive to the liability associated with greased bearings.

External lubrication is an uncontrollable design variable for OEM engineers. Once the finished product is shipped to the customer they must properly maintain the bearing assembly. Failure can lead to liability or warranty claims. If proper main-tenance is a concern, the best solution is a self-lubricating composite bearing. Self-lubrication is the ideal solution since it fully lubricates the contact surfaces requiring absolutely no field or long term maintenance. Dry lubrication does not attract dust or dirt and results in no environmental grease or oil contamination.

When to use polylube beArings• When dry lubrication is required.

• When bearing neglect could lead to product liability claims or premature failure.

• When planned maintenance intervals need to be extended.

• When conventional lubricants will not function or cannot be used (as in the food processing and pharmaceutical industries).

• When bearing, lubrication system, and maintenance costs need to be reduced.

• When wide temperature ranges, particularly at low temperatures, require bearing performance stability.

• When stick-slip conditions exist.

• When high load capacities are needed.

• When resistance to chemical, galvanic, or fretting related corrosion is a problem.

• When weight reduction is desired.

• When galling and scoring need to be minimized.

• When shock loads present a problem.

• When electrical insulation is required.



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Hex ID and special ID shapes can be incorporated into the bearing as well.

Polygon’s CNC fabrication equipment allows for special designs to be economically incorporated.

“One of the most common failures

for bearing design is when

lubrication is not properly

maintained. PolyLube® bearings

eliminate lubrication maintenance.”

Composite beArings CompAreDToday’s OEM engineer has many bearing alternatives to choose from. When making a design decision, it can be difficult to weigh material choices for your design. Consult this application-driven discussion comparing composite bearings to common alternatives. The following sections are provided to allow comparison between composites and materials engineers may have more design familiarity.

greAseD beAringsThe most obvious difference? These bearings require perpetual greasing, adding both material and labor costs to the product. When the lubricating film fails due to contamination, the bearing will prematurely wear. Performance of this bearing is entirely reliant on the end user properly maintaining and servicing the bearing joint in question.



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When grease fails these bearings quickly wear through and produce intimate contact between the shaft and bearing.

“Performance of a greased bearing

is entirely reliant on the end user

properly maintaining and servicing

the bearing joint.”

Cast Bronze 6,000* 160* 10 8.8

Porous Bronze 4,000** 160** 10 7.5

Alloyed Bronze 10,000* 200* 16 8.1

Steel-Backed Bronze 3,500* 200* 8 8.0

Hardened Steel 40,000* 200* 7 7.9

Zinc Aluminum 5,500* 200* 15 5.0

Fabric-Reinforced Phenolic 6,000* 200* 20 1.6

Reinforced Teflon† 2,000 500 55 2.0

PolyLube® MRP 30,000 425 4.8 1.87

*with lubrication **oil impregnated †DuPont™

ADDitionAL PErForMAncE DiFFErEncEs:• Greased metal-backed bearing materials have very limited operating temperature ranges. They traditionally span from -40 to +210°F compared to PolyLube® ranges from -325 to 425°F.

• Particulate contamination leads to mixed-mode lubrication and failure.

MAtEriAL MAX. DYnAMic MAXiMuM tHErMAL sPEciFic cAPAcitY-Psi tEMPErAturE EXPAnsion GrAvitY (LEss tHAn 5 sFPM) °F 10-6 in./in./°F

sintereD metAlliC beAringsSintered metallic bearings have innate limitations due to their semi-fused nature. The structure dramatically reduces impact or shock loading capability as well as both the static and dynamic loading capacities.

ADDitionAL PErForMAncE DiFFErEncEs:• At best, dynamic capacities of 8,000 PSI.

• Alloyed bronze bearings have the highest dynamic capacity within this family and that is 10,000 PSI or less than 5 SFM with lubrication.

• Lowered impact or fatigue strength properties.

• Prone to corrosion and shaft fretting.

• Many times burnishing tools are required to get product to final geometric tolerances.

filleD thermoplAstiC beAring mAteriAls• Sizing predictability – Injection molding leads to higher size variation.

• Creep – Thermoplastics will plastically deform over time under load.

• Impact Fatigue – Even glass filled thermoplastic resins can only go so far with resistance to repeated impact.

• Moisture absorption – Swelling can occur with thermoplastics in submerged or humid environments causing binding between pin and bearing.

• Retention – The homogeneous construction of filled thermoplastic bearings means the bearing is being held in the housing with the same material interacting with the pin, allowing a greater frequency of walking or spinning in the bore.

metAl bACkeD beAringsMetal backed bearing materials have been an obvious choice given their feature/benefit combination and initial purchase price. However, PolyLube® bearings are quite often the clear winners when total cost of operation is considered.

ADDitionAL PErForMAncE DiFFErEncEs:• Requires regular greasing maintenance by the end user, especially in high contaminate environments.

• This bearing type is very sensitive to misalignment. Load concentration on the edges can cause increased wear on the PTFE overlay, leading to intimate contact between the metal substrate and pin.

• Heavy machinery requires frequent greasing, downtime, and labor costs to per form this maintenance. This adds up to significant costs for the end user over the life of a product.

• Metal backed bearings prematurely fail once the overlay is broken into and the shaft is in intimate contact with the lining.

• Metal ID surfaces cannot embed contaminates, leading to scoring and premature failure.

• Dynamic capacities typically at 20,000 PSI maximum, compared to 30,000 PSI with PolyLube.

• Require the added cost of grease zerks, factory greasing, and possibly automatic greasing systems all of which are not needed with PolyLube’s permanent lubrication.

• As with any metal structure, this type of bearing is subject to severe corrosion— an issue that can occur as quickly as 24 hours into basic immersion testing.

• Thermoplastic bearings are prone to swelling when subjected to moisture.



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Sintered structure bearings can’t handle the load of composite bearings

Filled thermoplastics have no chance in highly loaded environments.

Once the overlay is worn through, intimate contact and failure can quickly result.

Thermoplastics are highly subject to cold flow under load-ing—something PolyLube® bearings do not struggle with.

rolling element beAringsPolyLube® bearings are able to handle higher load capacities than rolling element bearings, particularly with shock loading.

ADDitionAL PErForMAncE DiFFErEncEs:• Reduce the weight and profile of the bearing—in many cases the weight and profile of the bearing can be reduced by over 50%.

• PolyLube exhibits much higher static load capacities—an equivalent sized needle bearing will only have 30% of the static capacity.

• No external lubrication is required with PolyLube—there are no concerns with failed lubrication media resulting in shaft damage.

• By using the PTFE film transfer process instead of macro mechanical moving parts, PolyLube is able to have stable and predictable performance over the life of the application.

• Rolling element bearings can only be used in contaminated environments if the costly option of integrated seals are used.

breAk-in AnD film trAnsferThe secret to PolyLube’s high load greaseless operation is the use of uniquely woven PTFE super-filaments in the bearing liner. They exhibit tensile strengths twenty times greater than PTFE resins and are not subject to cold flow under high load. No secondary lubrication is necessary due to the film transfer process, even during start-up.

As the bearing begins service, the liner’s PTFE undergoes a phase change and disburs-es over the mating pin surface, transferring from the inner diameter to the pin's wear surface and smoothing out any macroscopic surface imperfections. Essentially, a small amount of the liner is worn away and sacrificed to coat the pin with a low friction PTFE film. This wear is often negligible, usually less than 0.001”.

This allows the bearing to have a very low coefficient of friction with minimal long-term wear, under high loading conditions. Following the break-in period, the wear rate sta-bilizes, remaining relatively constant for the bearings’ life. Testing of the MRP bearing at 22,500 pounds, with 50° oscillation angle, resulted in stable wear under 0.005” at over 1.5 million cycles.

The elapsed time for break-in is PV (Pressure and Velocity) dependent. The equilibrium wear rate varies from operation to operation, due to a number of factors including: loads, speeds, shaft hardness, material, and shaft surface finish. For more specific guidance on the break-in period to anticipate given your specific application, please contact a PolyLube application engineer.

PolyLube MRP bearings are designed to minimize wear; however, the bearing wear is dependent on general operating conditions, such as speed, sliding distance and load. With intermittent rotation or oscillation, radial wear should be negligible over thousands of hours. Hard chrome plating gives excellent wear performance and protects the shaft from corrosion. Coatings such as chrome, electroless nickel, YZD or nitro carbonizing are all common treatments for shaft materials used with PolyLube bearings. Some cus-tomers have even experienced great results using standard 1018 shaft material.



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Typical metal needle bearings fail under high loading.

“No external lubrication is required

with PolyLube®— there are no

concerns with failed lubrication

media resulting in shaft damage.”

mrp beAringsProDuct HistorYThe MRP bearing was born from Polygon’s continuous improvement efforts. Original targets for the bearing were lower cost and lower performance. The actual result was a decrease in cost due to thorough analysis and value stream mapping of the manufacturing process and virtually identical performance compared to our legacy product. The MRP bearing has become the standard product offered for bearing customers and has supplanted the legacy product.

ProDuct DEscriPtionThe MRP has a unique added lubricant embedded within the surface of the liner material to decrease the initial coefficient of friction. This small change was initi-ated because in certain lightly loaded joints, upon initial actuation, an intermittent stick-slip or noise could be generated. The MRP addresses this issue by decreas-ing friction and virtually eliminating the typical break in period.

PolyLube® MRP bearings are designed to minimize wear; however, the bearing wear is affected by the general operating conditions, such as speed, sliding distance and load. With intermittent rotation or oscillation, radial wear should be negligible over thousands of hours. Hard chrome plating gives excellent wear performance and protects the shaft from corrosion. Softer coatings such as cadmium or zinc may exhibit different wear characteristics but are perfectly suitable for use against the MRP surface.



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MrP BearingsVersatile high load, low friction composite bearings.

PIN SURFACE ROUGHNESS

INITIAL COEFFICIENT OF FRICTION1018 steel ground and polished

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MRP STATIC

MRP DYNAMIC


“These issues come together to allow

Polygon to sell a product better

matched to customers’ needs.”

MRP Bearings are available in a wide variety of standard and custom sizes.

Cutaway showing the unique low friction fiber lining architecture.

mrp beAringsMEcHAnicAL AnD PHYsicAL ProPErtiEsThe PolyLube® MRP bearing can withstand static loads of approximately 70,000 PSI and 30,000 PSI under dynamic loading. For dry running applications, the maximum speed is approximately 10 surface feet per minute. The typical aver-age design pressure for high duty cycle applications is 10,000 PSI.

This bearing’s operating temperature range is ±325°F. Maximum continuous operational surface temperature for the standard formulation is 325°F, depend-ing upon load characteristics. The bearing has been heat stabilized at these temperatures, so that little dimensional change will occur in the bearing during operation. In a free state, the coefficient of thermal expansion of the PolyLube MRP bearing is 4.8 x 10-6 in/in/°F, very close to steel and much lower than

most bronze alloys.

APPLicAtionsPolyLube MRP bearings are the bearing of choice in highly loaded bearing joints where a life cycle of over 500,000 cycles is desired. Testing has shown this bearing has wear under 0.006" after 1.6 million cycles. Applications include material handling equipment, high duty cranes, earth-moving equipment, con-struction equipment, agriculture equipment and food processing systems. MRP bearings have extremely low absorption rates and are well designed for wet and submerged applications.



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MrP BearingsVersatile high load, low friction composite bearings.


Ultimate Compression Strength (PSI) 70,000

Unit Load Limit (PSI) 30,000

Temperature Range (Standard Formulation) ±325°F

Coefficient Of Thermal Expansion (in/in/°F) 4.8 x 10-6

Thermal Conductivity (BTU • in/(hr • Ft2 •°F)) 1.8-2.3

Water Absorption (2 Hours) 0.12%


Specific Gravity 1.87

Maximum Velocity (SFM) 10

MRP eliminates the maintenance of greased joints.

MRP at work.

PolyLube® is standard in the aerial work platform where reduced warranty claims are made.

eWs beAringsHiGH wEAr cYcLEs iMProvE MAintEnAncE tiME winDows Polygon is proud to announce its newest bearing line, the EWS bearing. In an industry where progress is typically around 10% or 15%, PolyLube EWS has shattered this expectation by showing a marked 300% improvement in a clean testing environment. The test is compared to standard PolyLube MRP’s industry-leading performance and is made possible through a significant technological leap in tribology research. Contaminated environments are also handled well, with an improvement of 350% versus MRP.

ProDuct HistorYThe inspiration for the EWS bearing was a high frequency, low oscillation angle agricultural application that built total sliding distances quickly and resulted in wear failures. To solve this, Polygon utilized tribology research to create a new composite bearing liner system, custom engineered to improve the performance of wear surfaces.

The EWS bearing has the same specifications as our flagship MRP bearing line but with increased wear resistance and reliability in contaminated joint locations with small design envelopes. Seals and their machining cost can sometimes be eliminated thanks to the increased contaminated environment performance.



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eWs BearingsVersatile high load, low friction composite bearings.


TOTAL DISTANCE BEFORE FAILURE–WEAR RATE COMPARISONGREASED BEARINGS* GREASELESS BEARINGS

RELATIVE SLIDING DISTANCE (longer is better)

C93700BRONZE

SINTEREDIRON/COPPER

GRAPHITE PLUGGED BRONZE

POLYLUBE®

MRP®

POLYLUBE®

EWS™

*Received initial greasing, then allowed to run without further lubrication.EWS shows a 300% improvement in wear rates over our standard MRP line in a clean testing environment, and 350% in contami-nated working conditions.

eWs beAringsconstruction AnD MininG When large construction machinery is taken off-line, entire projects can be paused leading to costly delays. The PolyLube® EWS™ bearing allows for equip-ment to operate maintenance-free for longer periods of time. Beyond the normal demands for reliability and predictability, this can also reduce the number of scheduled maintenance visits and their attendant downtime. Extended wear can allow scheduled bearing replacement to be combined with other major compo-nent overhaul maintenance schedules on a single call.

AGricuLturAL EQuiPMEntPlanting and harvesting seasons occur in narrow windows of time, requiring the equipment to be ready for use. The need for longer lasting bearings becomes increasingly important with today’s larger equipment. Not only does increased size bring more points of failure, equipment is moving through the fields faster as acres farmed per piece of equipment grows.

EWS shows excellent wear properties in contaminated environments and can help move maintenance into off-season, preserving uptime in critical seasons.

MEcHAnicAL AnD PHYsicAL ProPErtiEs



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eWs BearingsVersatile high load, low friction composite bearings.




Temperature Range (°F) ±325

Coefficient of Thermal Expansion (in/in/°F) 4.8 x 10-6

Thermal Conductivity (BTU*in(hr*ft2*°F)) 1.8-2.3

Water Absorption (2 hours) 0.12%

Water Absorption (24 hours) 0.16%

Specific Gravity 1.87 - 1.95


EWS provides long service life. Replacements can be combined with other scheduled maintenance to reduce downtime if needed.

EWS was inspired by the challenging needs of the agricultural market.

EWS is well suited for applications with increased dith-ering or high cycle wear. Also showed improvement in contaminated environments.

glAss tApe beAringsProDuct DEscriPtionThe PolyLube® Glass Tape bearing is a moderate RPM bearing designed for applica-tions with higher surface velocities or when mixed film conditions are desired.

The Glass Tape bearing is manufactured by a filament winding process that results in a continuous fiberglass filament backing composition-ensuring excellent mechanical properties (especially fatigue resistance) are attained. The filament wound fiber-glass structure uses a high strength, corrosion resistant epoxy resin as the matrix material. The high strength backing permits the use of a thin wall (1/16" to 1/8") bearing which can often reduce the size and weight of the finished bearing assem-bly. PolyLube Glass Tape bearings will support a dynamic bearing load of 7,000 PSI, while handling high radial and longitudinal stresses with a static bearing capacity of 70,000 PSI. This family of materials exhibits exceptional dimensional stability and performance predictability over wide temperature ranges (±325°F).

ProDuct scHEMAticThe PolyLube Glass Tape lined bearing is similar in backing construction whencompared to its sister product- the MRP bearing; the difference in theconstruction of the liner material drives the variations in performance. The primaryperformance variation between the Glass Tape and the MRP bearings is thelower coefficient of friction for the Glass Tape bearing allowing for higher surface velocities.

However, the Glass Tape bearing sacrifices some capabilities with a slightlylower dynamic load capacity. These differences are driven from fact that the Glass Tape bearing uses a proprietary filled PTFE resin structure as opposed to the contin-uous PTFE filaments used in the MRP product. Two liner thicknesses are available with the 0.015" thick liner being standard and a 0.030" thick liner being available for unique applications. The 0.030" thick liner is designed for applications where boring the inner diameter might be required in order to achieve tighter tolerances in an effort to address sizing and minor misalignment conditions.

MEcHAnicAL AnD PHYsicAL ProPErtiEsThe PolyLube Glass Tape bearing can withstand static loads of approximately 70,000 PSI and 7,000 PSI under dynamic loading. At these loading levels, mini-mum distortion will occur. For dry running applications, the maximum speed is approximately 80 surface feet per minute.

This bearing’s operating temperature range is ±325°F. Maximum continuous opera-tional surface temperature for the standard formulation is 325°F, depending upon load characteristics. The bearing has been heat stabilized at these temperatures, so that little dimensional change will occur in the bearing during operation. In a free state, the coefficient of expansion of the PolyLube Glass Tape bearing is 4.8 x 10-6 in/in/°F, lower than steel and most metals.



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glass TaPe BearingsVersatile high load, low friction composite bearings.


Glass Tape bearings combine high load and lowered friction.

glAss tApe beAringsMEcHAnicAL AnD PHYsicAL ProPErtiEsThe Glass Tape Bearing has the lowest coefficient of friction in the PolyLube bearing line. COF is a function of pressure. Static coefficients of friction have been measured as low as 0.06. The low frictional response coupled with the higher temperature capabilities of the liner allow for the bearing to operate at higher speeds. Less heat is generated during operation and the temperature at the contact surface of the bearing can be allowed to reach higher temperatures. This combination of material properties for the PolyLube Glass Tape Bearing allow continuous operation at speeds as high as 80 ft/min.



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glass TaPe BearingsVersatile high load, low friction composite bearings.


APPLicAtionsThe PolyLube Glass Tape Bearing should be considered when applications require higher speeds or are extremely sensitive to friction. Pneumatic cylinder gland, or guide rod, bearings are typically suited to the Glass Tape liner. The requirement for the minimum air pressure needed to begin actuation as well as the high speeds generated make the PolyLube Glass Tape the liner of choice. Other applications include sheave bearings, leveling mechanisms for aerial work platforms, and stem journal bearings for butterfly valves.

Considerations for choosing the PolyLube Glass Tape liner include the presence of contamination as well as the surface finish of the pin. The soft and homo-geneous nature of the Glass Tape liner results in superior frictional response as well as abrasion resistance. The trade-off is the inability to work in even moderately contaminated environments. Pin surface finish should be balanced with cycles required for the expected life of the machine. Optimal surface finish is 16 μin. The PolyLube Glass Tape Bearing is capable of operating with a pin surface finish as high as 32 μin with a moderate reduction in the wear life. Pin finishes in excess of 32 μin are not recommended for use with the PolyLube Glass Tape Bearing.



Temperature Range (Standard Formulation) ±325°F

Coefficient Of thermal Expansion (in/in/°F) 4.8 x 10-6






ifr bACkeD beAringsProDuct DEscriPtionThe IFR backing is typically combined with either the MRP or EWS bearing liner to increase service life in applications with high edge loading caused by misalignment. The IFR backed bearing (for Improved Fatigue Resistance) offers a proprietary laminate structure of the bearing backing that increases the bear-ing’s resistance to repeated stress/strain conditions.

Several years ago, Polygon Company was approached with a seemingly straight-forward application for traditional filament wound composite bearings. At issue was an application that was resulting in bearing failure due to high misalign-ment from a cantilevered design. The pressure on the bearing was well under the design threshold (actual applied pressure to the bearing was 10,000 PSI). In response to this customer’s demand, Polygon Company developed an im-proved fatigue bearing that in the case of the above application, increased the life of the bearing by more than 50%.

Because composite filament wound bearings are not isotropic materials as are metals, Polygon Company’s FEA laminate analysis focused on optimization of system’s interlaminar shear. The PolyLube® IFR backed bearing offers a more than twofold increase in fatigue life over traditional composite bearing materials.

ProDuct ADvAntAGEsThe PolyLube IFR bearing is the first bearing with such an optimized resin system and fiber/laminate architecture.



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ifr Backed BearingsVersatile high load, low friction composite bearings.


EWS/IFR bearings combine the excellent wear life of EWS with the improved properties of an IFR backing.

MRP/IFR bearings are recommended for applications with high edge loading.

ifr bACkeD beAringsMEcHAnicAL AnD PHYsicAL ProPErtiEsThe PolyLube® IFR backed bearing can withstand static loads of approximately 70,000 PSI and 30,000 PSI under dynamic loading. At these loading levels, minimum distortion will occur. For dry running applications, the maximum speed is approximately 10 surface feet per minute. The typical average design pressure for high duty cycle applications is 10,000 PSI.

This bearing’s operating temperature range is ±325°F. Maximum continuous opera-tional surface temperature for the standard formulation is 325°F, depending upon load characteristics. The bearing has been heat stabilized at these temperatures, so that little dimensional change will occur in the bearing during operation. In a free state, the coefficient of expansion of the PolyLube IFR bearing is 4.8 x 10-6 in/in/°F, lower than steel and most metals.



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ifr Backed BearingsVersatile high load, low friction composite bearings.


PoLYLubE® iFr bAckED bEArinG APPLicAtionsExcellent applications for IFR backed bearings include bearing systems using alloyed bronze, spring-retained, hardened bearings and hardened steel bearings.

IFR backed bearing are well suited for applications with large magnitude changes in stresses.

high temperAture beAringsProDuct DEscriPtionThe PolyLube®HT bearing is a high load, low RPM bearing designed for applica-tions where self-lubrication is desired, but conventional composite bearings will not perform high temperatures. This product has been designed to provide ex-cellent performance at elevated temperatures. With a glass transition tempera-ture of over 425°F this epoxy filament wound structure exhibits superb perfor-mance over extended exposure to elevated temperatures. The bearing material is focused on applications where the bearing will be exposed to temperatures up to 425°F.

In addition to its high compressive properties (in both static and dynamic modes), this bearing material is inherently self-lubricating. The self-lubrication capability of Polygon’s new material means that the use of expensive high temperature external lubricants such as polyurea grease, lithium grease, some bentone greases, as well as advanced ester based oils and complex thickening systems may no longer be necessary.

The PolyLube HT bearing creates a high strength, self-lubricating journal bearing material that can offer performance enhancements over greased systems, as well as graphite loaded bronze structures, some iron-copper graphites, polysul-fone, PEEK, and polymide bearing materials.

ProDuct scHEMAticThis bearing is based on the same filament wound structure as the PolyLube MRP bearing and has the same wear liner. The result is that the HT bearing has a high static and dynamic load capacity. The HT bearing is also inherently self-lubricating through the same film transfer process as the MRP Series bearing.

The result of a higher temperature resin matrix, the same high strength filament wound backing, and the same self-lubrication process combine to make the HT bearing an ideal solution for high temperature applications.



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HigH TeMPeraTure BearingsVersatile high load, low friction composite bearings.


Standard High Temperature Bearing.

The PolyLube® High Temperature bearing was originated from development work the company was doing on high temperature, high RPM, high radially stressed com-posite materials for ring reinforced commutators. The end was replacing steel-mica rings with a high strength composite material.

“The PolyLube® HT bearing can offer

performance enhancements over

greased systems, as well as

polysulfone, PEEK, and polymide

bearing materials.”

high temperAture beAringsMEcHAnicAL AnD PHYsicAL ProPErtiEs



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HigH TeMPeraTure BearingsVersatile high load, low friction composite bearings.


APPLicAtionsPolyLube® High Temperature applications are not just for elevated tem-perature environments but also for applications where the bearing may need to resist thermal expansion during operation. One example of this is in snowmobile clutch markets. In these applications, the clutch speed goes from 0 to very high RPM’s in micro-seconds (and vice versa). During this cycling, friction is rising because speed is being dra-matically increased. As the friction goes up so does the temperature of the associated components. A high temperature composite bearing material can resist these expansion phenomena and as a result offer better long term wear, improved bearing durability, and less seizure op-portunity than conventional metal bearing materials.



Temperature Range (Standard Formulation) -325 to 425°F

Coefficient Of Thermal Expansion (in/in/°F) 4.8 x 10-6






guiDe roD beAringsProDuct DEscriPtionPolyLube® Guide Rod Bearings are designed as replacements for traditional metallic guide rod bearing materials. Replacing conventional metallic guide rod bearings with a PolyLube guide rod bearing is a straight-forward change out. Typical replacement programs where metallic guide rod bearings are replaced are driven from one or a combination of several of the following factors.

PolyLube Guide Rod Bearings are commonly available in two formats: a PolyLube bearing utilizing a glass liner or a PolyLube bearing utilizing a PTFE fabric liner. The most common PolyLube guide rod bearing in use today is the glass liner due to two primary performance enhancements over the PTFE fabric lined bearing: the frictional response under start-up conditions and the transfer of PTFE to the wear surface.

coMPArisons to coMMon GuiDE roD bEArinG MAtEriALs sintErED (PM) structurE bronzESintered powder metal (PM) structure bearings rely on an internal lubricant that is entrapped into the metallic structure as it undergoes the sintering process. As the bearing is cycled the lubricant migrates to the wear surface as a natural function of compression and thermal expansion which forces the lubricant to flow to the area of bearing wear, but also as the bearing itself is worn away and the lubricant finds itself in contact with the pin material. Several problems exist for this type of bearing material.

First, these bearings have a poor load capacity in either dynamic or static condi-tions. In linear slide block applications, this load capacity can become increas-ingly problematic. As the load on the bearing assembly increases, the bearings will wear to accommodate the emerging load pattern during the bearing’s cycle. As this process advances, the bearing assembly’s accommodation will translate into increased slop in the slide block itself, and will ultimately result in a slide block that is no longer cycling per the manufacturer’s requirements as well as causing increased seal wear from piston misalignment.

rEAsons to DEsiGn witH PoLYLubE® GuiDE roD bEArinGs:



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guide rod BearingsVersatile high load, low friction composite bearings.


Examples of current Guide Rod Bearings.

“PolyLube® Guide Rod Bearings offer

improved stick-slip properties and a

reduction in shaft scoring.”

• Improved stick-slip properties

• Optimal frictional response during cycling

• Significant reduction in shaft scoring

• Extension in the bearing life

• Reduction in bearing profile

• Greatly improved side load/ misalignment capacity

• Increase in load capacity of bearing

• Enhanced corrosion resistance

• Tolerance of more cost effective shaft finishes

• Lower in weight

• Eliminates galvanic reactions

guiDe roD beAringscoMPArisons to coMMon GuiDE roD bEArinG MAtEriALs sin-tErED (PM) structurE bronzE – continuEDSecond, sinter structure bronze bearings have a lubrication mechanism that is both unreliable and easy to deplete. This means that shaft scoring, high friction, and high wear are all anticipated with these bearing materials. PM structure bearings must wear in order to continue to transfer lubricant to the wear surface. In linear slide applications the surface area that must be covered with lubricant is significantly greater than what is seen in oscillatory or rotational movement environments. As such, the frictional response and wear patterns of PM structure bearings degrade much more rapidly than higher performance bearing materials.

coMPArisons to coMMon GuiDE roD bEArinG MAtEriALs MEtAL-bAckEDThis family of bearing materials is divided into two product types: the first is true ring structure metal backed bearings and the second is split seam journal bearings. Ring structure bearings are expensive to manufacture given the means by which the bearing liner is inserted into the bearing ID. The labor required to complete this process, as well as the necessary secondary labor to manufacture the bearing to the tolerances required, result in an overly expensive bearing.

The second type of metal-backed bearing is the more common split seam journal bearing. This bearing exhibits good frictional response during start up conditions but is prone to excessive wear. The PTFE overlay is very thin (typically only 0.001") and is quickly worn away in linear motion applications where the surface area that the PTFE must be transferred to is greater than the surface area of a conventional rotational or oscillatory application. In addition, start-up running clearances change very quickly in metal-backed bearings due to the thin soft PTFE overlay on top of the bronze inter-structure being scrubbed off of the bearing bore surface. Strict running clearances quickly disappear as the liner wears and tries to stabilize. Depending upon shaft finishes, wear simply acceler-ates resulting in unwanted clearances and assembly looseness. A PolyLube® composite self-lubricating bearing offers minimal break-in and reliable self-lubri-cation through application life.



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Example of a worn metal backed bearing.

“With metal-backed journal

bearings, startup running clearances

change quickly due to the thin and

soft PTFE overlay on top of the

bronze interstructure being scrubbed

off the bearing surface.”

guiDe roD beAringscoMPArisons to coMMon GuiDE roD bEArinG MAtEriALs tHErMoPLAsticA common and low cost guide rod bearing material is thermoplastics. These type of bearing materials share most of the design and performance limitations that PM structure metal bearings do because the thermoplastic bearing material itself is similar in its structure as that of a PM metallic bearing. Thermoplastics however have two additional problems associated to linear motion environments.

First, in applications where the slide velocity is high, a thermoplastic guide rod bearing does not tolerate the heat generated from such quick response require-ments. The most common thermoplastic bearing grade materials will bind on the shaft and actually begin to break down mechanically as the bearing is cycled. The amount of lubricant and fillers will play a dynamic role in the relationship between mechanical and performance degradation as it relates to velocity.

Second, thermoplastic bearing materials are prone to cold flow. Under constant load many thermoplastic guide rod bearings will exhibit creep. This creep will result in slop in the bearing assembly and will negatively effect any precision the slide block is expected to maintain.

bLAck DEbris sHAFt DEPositionIn some linear motion application environments, a black debris develops on the distal and proximal ends of the shaft during normal cycling conditions. This debris is commonly seen when a sintered PTFE lined bearing is used.

This debris is most commonly the result of a complex interaction between the pin material itself, the liner selection, and the rate of deceleration of the bearing assembly. In some linear guide applications, the weight of the bearing assem-bly itself creates a macro-mechanical edge rolling condition as the assembly decelerates. For a sintered PTFE lined bearing (not a fabric PTFE lined bearing), this deceleration causes parts of the bearing liner to roll as the motion reverses itself. The nature of the resin the PTFE is entrapped within can create the poten-tial for the resin itself to bind against the shaft. As this phenomena is repeated, the liner will fatigue and begin to transfer macroscopic portions of the liner onto the shaft due to the thin soft PTFE overlay on top of the bronze inter-structure being scrubbed off of the bearing bore surface. Strict running clearances quickly disappear as the liner wears and tries to stabilize. Depending upon shaft finishes, wear simply accelerates resulting in unwanted clearances and assembly loose-ness. A PolyLube® composite self-lubricating bearing offers minimal break-in and reliable self-lubrication through application life.



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Thermoplastic bushings are prone to cold flow.

“In applications where the slide

velocity is high, a thermoplastic

guide rod bearing does not tolerate

the heat generated from such quick

response requirements.”

Worn guide rod from a center lined PTFE bearing.

guiDe roD beAringsbLAck DEbris sHAFt DEPosition – continuEDThis debris deposition is application specific and is not seen in all application environments. In other application environments, the black debris is seen in relation to sintered (PM) structure bronze or brass bearings. In this case, the black discoloration is not purely a deposition of material onto the shaft, but rather a scoring effect common to ring structure bearings that have a low tolerance for missing lubricant or contamination.

The solution to an application where liner debris is being deposited on the shaft is to alter the bearing’s wear surface to a non-resinous and non-metallic liner. In these cases, Polygon recommends transfer to one of its PolyLube® fabric lined bearings such as the PolyLube® MRP or Z-Series bearings. These bearings incorporate high tenacity PTFE filaments in their continuous architecture. This is in contrast to PTFE resinous systems which rely on either a sintered powder form of the PTFE polymer or to another resin (such as acetal) with PTFE fibers randomly dispersed within the resin itself.

The PolyLube bearings that have high tenacity PTFE filaments in their architec-ture allow for the bearing assembly to undergo aggressive deceleration condi-tions without depositing the PTFE or the resin carrier medium onto the shaft. This is because the wear surface of the fabric lined bearings utilize the fila-ments themselves without reliance on a resinous impregnation.

PoLYLubE iD sEAL conFiGurAtionsIncorporating T-lip wiper seals, radial shaft seals, o-rings or any other similar internal sealing system is not a problem for PolyLube Guide Rod Bearings. Polygon’s internal fabrication capabilities allow for easy and economicalincorporation of ID features required to install common sealing systems.

Two liner thicknesses are available in the standard PolyLube PTFE tape lined bearing configuration: the 0.015" thick liner being standard and a 0.030" thick liner also being available for applications where seal geometry might require the introduction of a thicker liner to accommodate a unique ID feature. The 0.030” thick liner can also be used in applications where boring the ID might be required in order to achieve tighter tolerances in an effort to address sizing and minor misalignment conditions.



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Polygon cylinder guide rod bushing with machined seal groove.

“The solution to an application

where liner debris is being deposited

on the shaft is to alter the bearing’s

wear surface to a non-resinous and

non-metallic liner.”

Cut-away photo of guide rod bushing with machined grooves.

guiDe roD beAringsPoLYLubE® FAbricAtion cAPAbiLitiEsOne common fabrication detail seen on guide rod bearing applications deal with corner radiuses on internal and external grooves. Because Polygon uses a diamond wheel or groove tool to form the grooves we need to have at least a .015-.020" corner radius. When threads are used there is usually clearance involved. When assembled with the mating part the bearing could shift to one side or the other impacting the location of the bearing surface in relation to the piston shaft. This could have a negative impact on wear.

The only other fabrication issue commonly seen on incoming prints is a surface finish called out on the internal diameter. This is typically related to an OEM’s historical use of machined bronze bearings in the application. Since the bronze is machined from a solid piece or casting, the surface finish is called out since it is related to the speeds and feeds of their fabrication process. The wear sur-face on PolyLube® bearings is not machined so the surface finish call out can be removed from fabrication requirements.

Polygon is capable of holding a TIR I.D. to O.D. within .002" and straight diam-eters to +/-.0005".

MEcHAnicAL AnD PHYsicAL ProPErtiEsPolyLube Guide Rod bearings are manufactured by a filament winding process that results in a continuous fiberglass filament backing ensuring excellent mechanical properties (especially fatigue resistance). The filament wound fiberglass structure uses a high strength, corrosion resistant epoxy resin as the matrix material. The high strength backing permits the use of a thin wall (1/16" to 1/8") bearing which can often reduce the size and weight of the finished bearing assembly. This family of materials exhibits exceptional dimensional stability and performance predictability over wide temperature ranges (±325°F).



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PolyLube® flanged face guide rod bearing.

“The high strength backing permits

the use of a thin wall (1/16" to 1/18")

which can often reduce the size and

weight of the finished bearing.”

guiDe roD beAringsMEcHAnicAL AnD PHYsicAL ProPErtiEs (continuED)This bearing’s operating temperature range is ±325°F. Maximum continuous operational surface temperature for the standard formulation is 325°F, depend-ing upon load characteristics. The bearing has been heat stabilized at these temperatures, so that little dimensional change will occur in the bearing during operation. In a free state, the coefficient of expansion of the PolyLube® Guide Rod Bearing is 4.8 x 10-6 in/in/°F, lower than steel and most metals.

GLAss tAPE bEArinG



Temperature Range (Standard Formulation) ± 325°F

Coefficient Of Thermal Expansion (in/in/°F) 4.8 x 10¯6





MrP bEArinG



Temperature Range (Standard Formulation) ± 325°F

Coefficient Of Thermal Expansion (in/in/°F) 4.8 x 10¯6





See MRP for full specifications.



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All PolyLube® bearings can be machined and used in guide rod applications

Polygon has extensive in-house machining capability to meet application needs.

Machined grooves for seals provide protection in contaminated environments.

PolyLube bearings bring lifetime greaseless operation to linear motion applications.

pv CAlCulAtionsPV (Pressure & Velocity) is the most common empirical tool to use when comparing and contrasting bearing performance. “P” is related to pressure or pounds per square inch on the projected bearing area, while “V” is velocity in feet per minute of the wear surface. Knowing the PV limit of a bearing, the designer can determine the loads and surface running speeds under which a bearing can safely operate. The PV value is essentially an indicator for the amount of frictional energy generated. The high strength backing acts as a thermal insulator. The PolyLube MRP, EWS, and Fiber lined bearings all have a PV limit of 35,000 psi*ft/min. Due to differences in the coefficient of friction, and material composition the PolyLube Glass Tape lined bear-ing has a PV limit of 50,000 psi*ft/min. The PV values indicated are for continuous long term operations. Engineers often encounter joint designs in need of higher instantaneous values for PV that will occur infrequently. Typically if neither the maximum average working load nor speeds are exceeded, the application will be well served with a PolyLube bearing. Please consult a PolyLube Applications Engineer for specific design related questions.



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Bearing design PrinciPlesVersatile high load, low friction composite bearings.


π(ID)

Example: .750" Pin Dia @200 rpm 85.0 lb. total load, bearing length .750” V = 0.262* x rpm x diameter = 0.262 x 200 x .750 = 39.3 ft/min

P = total load / projected area (A)**

A = .750 (Pin) x .750 (bearing length) = .562 in.2

P = 85.0 lbs. / .562 in.2 = 151.2 psi

PV = 151.2 psi x 39.3 ft/min = 5,942 psi* ft/min

calculatIng sleeVe bearIng PV lImItfor a PractIcal IllustratIon of aPPlIed and defIned PV calculatIons, reference tHIs IllustratIon:

pin

pin

100

1000

10000

100000

0.2 2.0 20.0

P [p

si]

V [ft/min]

PV CAPABILITIES FOR POLYLUBE® BEARINGS

MRP, EWS, FIBER LINED BEARINGS GLASS TAPE LINED BEARINGS

200.0

PV caPabIlItIes for Polylube® bearIngs

π x D x RpM12

MisALiGnMEnt conDitionsMany applications undergo regular stressing of the bearing corners due to a misalignment condition. Should that condition be irregular, the existing PolyLube® series bearings are acceptable. It is important; however, to understand how misalignment impacts bearing performance and what conditions are identi-fied and analyzed by Polygon’s PolyLube application engineers. Misalignment conditions create a non-linear pressure area and significantly increase the edge stresses on the bearing. As a result, premature fatigue cracking can occur. The schematic below illustrates both conditions. For PolyLube bearings, concerns with edge stress and fatigue cracking become acute as the effective misalign-ment increases to 0.015 in/in or 0.86 degrees. Beyond that level, a different backing construction can be used to increase the bearing’s resistance to impact and resulting fatigue.



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A

B

VIEW A (METAL)

C C

VIEW B (METAL)

VIEW A (COMPOSITE)

VIEW B (COMPOSITE)

D D

VIEW C-CPRESSURE

VIEW D-DPRESSURE

Area of contact

Area of contact

EDGE LOADEDSHAFT

effectIVe angle mIsalIgnment0°- 13' - 45" 0.004 in./in.

0°- 20' - 38" 0.006 in./in.

0°- 34' - 23" 0.010 in./in.

0°- 51' - 34" 0.015 in./in.

LoAD cAPAcitYPolygon’s proprietary process of fiberglass filament winding results in exceptionally strong structures that can support the bearing surface more than adequately. Loading in excess of 30,000 PSI can be tolerated in many situations, provided the design and the conditions of service are fully outlined and analyzed by a Polygon bearing specialist. Fatigue is not a limiting factor in the use of PolyLube® bearings. Frequent laboratory tests have shown that the bearing is often more fatigue-resistant than the shaft. The typical average design pressure for high duty cycle applications

is 8,000 PSI.

MEcHAnicAL AnD PHYsicAL ProPErtiEsThe PolyLube MRP bearing can withstand static loads of approximately 70,000 PSI and dynamic loads as high as 30,000 PSI. A general design approach for application with oscillating pins and angular force vector changes less than 45 degrees should be designed to an average working pressure of 8,000 PSI. Polygon MRP bearings will allow pressure spikes as high as 12,000 PSI during approximately 5% of the operational life. Elastic deformation will occur at the rate of 0.001" per 1,860 PSI of pressure. Dry running applications can be operated at speeds as high as 10 surface feet per minute. Please consult a Polygon Application Engineer with any questions regarding loading conditions and bearing performance.

bEArinG wEArDuring the initial break-in period of a PolyLube bearing, a transfer film is cre-ated on the mating surface. In some operations, as much as 0.001" of wear may occur during this period, while in other operations, break-in wear may be negligible. For more detail on the break-in period and the mechanism by which each bearing achieves sufficient film transfer, refer to the respective product inserts.



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POLYLUBE® MRP SERIES WEAR ANALYSIS

POLYGON POLYLUBE® MRPPV=11,416 CONTINUOUS ROTATION psi*ft/min

TIME IN HOURS W

EAR

IN I

NCH

ES

0.0005

25 50 75 100 125 150 175 200 225 250

0.001

0.0015

0.002

0.0025

0.003

0.0035

BEARING COMPARISON PV=11,416 CONTINUOUS ROTATION

TIME IN HOURS

WEA

R IN

IN

CHES

0.0005

50 100 150 200 250

0.001

0.0015

0.002

0.0025

0.003

0.0035

POLYLUBE F

AssEMbLYWhen a PolyLube® bearing is press fit into a housing, it creates a highly loaded interference condition. This is possible because of the elastic properties of the bearing’s backing material. Press fits on wall thicknesses up to 1/8” have demonstrated that the close-in ratio is one-to-one (0.001 press yields a 0.001 close in). The amount of interference between the bearing and housing is directly proportional to the amount of force needed to install the bearing. Minimizing interference fits will offer a larger array of installation options for OEMs. This is especially important for applications requiring the installation of new pins and bearings in the field. Due to ther-mal lag, the bearing wear surface may be hotter than the adjacent housing, when heat is generated from running friction. As a result, the installed bear-ing may expand inward, reducing the shaft clearance.

For optimum performance shaft clearances should be increased for dry running applications with high velocities. Fluid cooling and lubricants will reduce the operating temperatures, permitting tighter shaft clearances. Heat transfer through the bearing wall is inversely proportional to the wall thickness. The thinner the wall, the greater the transfer of heat. Thermal conductivity, for example, is 1.8 to 2.3 Btu • in/(hr • ft2 •°F).

PolyLube Bearings are typically installed prior to painting processes to in-crease installation efficiency, decreasing costs due to overspray in the bore. E-coat and powder coat processes with temperatures as high as 500°F may be employed with the bearings already installed. It is recommended to use a plug in the bearing ID during abrasion and paint processes to maintain the integrity and frictional response of the bearing.

Pin sELEctionPolyLube bearing wear is a function of the interaction between the wear ma-terials in the liner and the pin. The majority of pins used in conjunction with PolyLube bearings are carbon steel. The grades range from 1018 to 4140. Pin selection is most important for designers to ensure the shear and tensile strengths are suitable for the specific application. The major proper-ties of concern for Polygon are the surface finish, hardness, and corrosion resistance. Each of these pin characteristics contribute to the bearing wear.

sYstEM LubricAtion inForMAtionSince lubrication is inherent in the bearing surface of PolyLube, engineers do not have to worry about these bearings drying out, causing shaft seizure and costly repairs. Because lubricants are not required, shaft corrosion should be a consideration during selection.

Lubricants may actually reduce wear rates by up to eight times. Liquid lu-bricants can carry away heat and reduce the coefficient of friction. Greases can be used to help prevent corrosion and keep contamination out of the housing when maintained properly. Additional lubrication can increase the performance characteristics of composite bearings. The major drawback for using lubricants is forcing the end user to maintain the joint. Lubricants can often trap contamination which act as a grinding compound to increase wear, adversely affecting the joint ultimately.



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LEAD-INCHAMFER

15˚-28˚

15˚-45˚

O.D. CHAMFEROR BREAK CORNER

(NO BURRS)

BULL NOSE RADIUS

Chamfer can be made with several different designs.

Dd

TR

POLYLUBE THRUST WASHER

FLANGEOD

ODID

LENGTHFLANGETHICKNESS

POLYLUBE FLANGE BEARING

d L

BEARING

PROJECTEDAREA

SLEAVEBEARING

15˚-28˚ 1/16” min. (1.6mm)

OptionalO-ring forRetention

STANDARD BEARINGINSTALLATION

STANDARD BEARINGINSTALLATION

15˚-28˚ 1/16” min. (1.6mm)

FLANGED BEARINGINSTALLATION

ID OD

LENGTH

POLYLUBE BEARING

15˚-28˚ 1/16” min. (1.6mm)

Optional SpringLoad Ball for

Retention

BEARING

PROJECTEDAREA

FLANGEDBEARING

FDFL

Ft

Fd FLT

D = Flange Diametert = Flange Thicknessd = Bearing Inside DiameterL = Flange Length

THRUSTWASHER

TDTd

The shallow angle will reduce

skiving on the O.D. upon bearing

insertion.

surFAcE FinisHThe optimum pin surface finish is a roughness average of 32 microinches. The mechanism allowing the bearing to operate in a dry condition is the transfer of the PTFE from the bearing to the pin. The peaks and valleys of the surface finish determine how much PTFE is transferred and if it will remain imbedded into the pin. During the break-in period, the bearing liner is shearing some of the peaks and filling the valleys with PTFE. The typical amount of bearing break-in wear running with 32 μin Ra pin is approximate-ly 0.001 inches. Following the PTFE transfer, the wear rate will stabilize to an approximate rate of 0.001 inches/35,000 cycles. The rate of wear given is intended to be a guide and will be affected based on load, speed, hard-ness, surface finish, contamination, and oscillation angles.

Polygon has many applications currently using pins rougher than the recom-mended surface finish. Pins with surface finishes higher than recommend-ed will experience both a higher initial coefficient of friction and a longer break-in period due to the additional PTFE needed to fill the deeper valleys. After the break-in period has been completed, the rate of wear and the coef-ficient of friction will behave similarly to the steady state experienced using the optimum pin finish. The trade-off to the cost savings for using a rougher pin is additional clearance after the break-in period. Some of the more extreme examples of higher surface finish pins are cold drawn 1018. The surface finish of these pins range from 50 – 120 microinches R.A.

Pins with too smooth a surface finish will adversely affect the bearing. The problem with using pins smoother than 16 μin Ra, is the inability for the surface finish to hold the transferred PTFE. The result is a continuous break-in period leading to a faster rate of bearing wear compared to joints using pins with the recommended surface finishes. It is better for the PolyLube® bearings to have pins with a surface finish greater than 32 micro-inches R.A. than a surface finish lower than 16 microinches R.A.

HArDnEssPin hardness requirements are dependent upon the operating conditions of the equipment. Softer pin materials, such as stainless steel, may be used when contamination is expected to be very low or the bearing is suitably protected with a seal or due to location. Empirical and laboratory data con-firm the compatibility of the various PolyLube liners with softer steel grades such as, 304, 316 and 1018, based on absence of pin wear.

Applications operating in moderate to highly contaminated environments will require pins with greater surface hardness. Polygon recommends a pin surface hardness of 50 Rockwell C. A hard surface will be less likely to score when contamination is rolled in the contact area between the pin and bearing. Pin wear is caused by aggressive contamination rather than materi-als contained in the PolyLube bearing liners.



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Compatibility with rougher pin finishes

allows the PolyLube® MRP® bearing to

decrease pin costs. 16 µin pins vs 125 µin

result in only 0.003 inches additional

wear over the life of most applications.

corrosion rEsistAncEPin corrosion will affect the surface finish of the pin as well as the running clearance. As a pin corrodes, there are a number of consequences to the operation of the joint. The three main problems introduced into the joint are increased pin OD, rougher surface finish, and oxide material contamination. The increased pin diameter could result in an interference fit and increased torque needed to turn the pin. The increased roughness of the pin surface will serve to additionally increase the torque required to operate the joint as well as increase the rate of wear. The addition of contaminates, in the form of the metal oxide, will further degrade the pin and bearing. Protecting the pin and bearing from contamination will lead to long term predictable wear regardless of the frequency of operation of the equipment.

Polygon recommends a corrosion resistant surface treatment for pins used in dry running applications. Many years of success have been experienced with customers using Hard Chrome, Electroless Nickel, and Nitrocarboriza-tion. Pins with these surface treatments will have hardness in excess of the Polygon recommendations for moderate to highly contaminated environ-ments. Thickness or depth of the treatment should be determined based on the chosen materials. Typical values are 0.0005 inches for both thick-ness and white layer depths. These values are not intended as recommen-dations, only as examples to allow designers a value to begin a conversa-tion with pin suppliers.

Softer surface treatments are also in use with Polygon bearings. Yellow Zinc Dichromate (YZD) is a cost effective alternative to the previous treatments given. YZD can be thought of as metal paint. The coating will be removed in the contact area by the bearing very quickly. The break-in period between the bearing and the base material will begin after the YZD has been worn away. There will be some added wear resulting from worn away YZD acting as contamination. Equipment seasonal in nature will also have a possibility of pin corrosion at the contact area. The transferred PTFE will act as a cor-rosion inhibitor if a sufficient amount has been transferred during the first season operation. The main purpose most designers state when using YZD is corrosion protection for the surface not in contact with the bearing. The result is a decrease in the migration of metal oxide particles into the joint compared to an untreated pin.



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PolyLube® is well suited to the high loads and the constant corrosion found in agriculture.

PolyLube polymer structure handles corrosive liquids as well.

ELEctricAL ProPErtiEsPolygon also produces epoxy fiberglass tubes to the UL-FW-G-10 specifica-tion. PolyLube® bearings exhibit similar electrical properties. The bearing wall provides insulation between the steel pin and structure to significantly increase the resistivity of the path to ground, compared to metallic bearings.

FAbricAtion GuiDELinEsThe most common type of fabrication customers have questions about is how to cut composite bearing materials. Depending on how critical the squareness (perpendicularity) of the cut needs to be, on smaller bearings a standard chop saw can be used. The typical tolerance for perpendicularity is 0.005" off the chop saw. Polygon recommends a diamond plated blade tipped with 120 grit diamonds. A rougher grit (80) can be used but that will often times result in a poorer surface finish. Polygon also recommends having the blade turning at between 1500-3000 rpm with a water-soluble coolant flooding the tube as it is being cut. This coolant will allow the tube to be cut without burning the end, will extend the life of the diamond blade, and will reduce the dust particulates generated during the cutting process.

On larger tubes, or when perpendicularity is critical, Polygon recommends cutting the tubes on a standard lathe. In production, this type of cut is done by mounting a tool post grinder on the cross slide and dividing the tube using a 120 grit diamond blade. A three jaw chuck is used to turn the tube indicating the tube so that it turns true to the tool post grinder. The tool post grinder is typically used at between 1500-3000 rpm and the tube is turned at 15-20 rpm when divided. Once again, the same type of coolant system is recommended. In addition, it is advisable to cut from the inside out whenever possible to eliminate the fraying of the liner on the inside of the bearing.

Many times after the bearing has been cut, a deburring operation needs to take place. A very simple deburring operation consisting of nothing more than spinning the part and holding a piece of sand paper against the out-side edge of the bearing will work quite well. The reverse is also possible by mounting a piece of sand paper in a drill press spindle and running the part onto the paper to remove any loose fibers caused by the cutting operation.

When turning the tubes on a lathe, Polygon recommends using a diamond tipped cutting insert. On our standard CNC lathe, the tube is turned at 2000-3000 rpm with a 0.003" per revolution feed rate. The depth of the cut is usually dependent on the length of the diamond tip on the cutting insert (typically between 0.060"-0.100"). It is important when cutting fiberglass using a diamond insert to again use a water soluble coolant to dissipate the heat generated while cutting. Excessive heat will cause the bond between the diamond and the carbide insert to fail, causing the tip to come off.



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Stock tube during processing.

“Tube post grinders along with

modern CNC lathes allow Polygon

to customize bearings to your

exact specs.”

¼"" Heavy Wall diMensionsHex or square ID available as well as flange bearings and secondary machining. Most tooling available to make special sizes. ID’s from 20" down to .125". All measurements in inches.


PWR08M16 1/2 0.5058 1.0025 1.000 0.0005 0.5000 0.0013 +/- 0.010 0.5088 1.0045 1.002 0.0045 0.4980 0.0103

PWR10M18 5/8 0.6309 1.1276 1.125 0.0005 0.6250 0.0013 +/- 0.010 0.6339 1.1296 1.127 0.0046 0.6230 0.0104

PWR12M20 3/4 0.7560 1.2526 1.250 0.0006 0.7500 0.0014 +/- 0.010 0.7590 1.2546 1.252 0.0046 0.7480 0.0104

PWR14M22 7/8 0.8811 1.3777 1.375 0.0006 0.8750 0.0014 +/- 0.010 0.8841 1.3797 1.377 0.0047 0.8730 0.0105

PWR16M24 1 1.0062 1.5027 1.500 0.0007 1.0000 0.0015 +/- 0.010 1.0092 1.5047 1.502 0.0047 0.9980 0.0105

PWR18M26 1-1/8 1.1314 1.6278 1.625 0.0007 1.1250 0.0016 +/- 0.010 1.1344 1.6298 1.627 0.0048 1.1230 0.0107

PWR20M28 1-1/4 1.2564 1.7528 1.750 0.0008 1.2500 0.0016 +/- 0.010 1.2594 1.7548 1.752 0.0048 1.2480 0.0106

PWR22M30 1-3/8 1.3816 1.8779 1.875 0.0008 1.3750 0.0017 +/- 0.010 1.3856 1.8799 1.877 0.0049 1.3730 0.0117

PWR24M32 1-1/2 1.5067 2.0029 2.000 0.0009 1.5000 0.0018 +/- 0.010 1.5107 2.0049 2.002 0.0049 1.4980 0.0118

PWR26M34 1-5/8 1.6318 2.1280 2.125 0.0009 1.6250 0.0018 +/- 0.010 1.6358 2.1300 2.127 0.0050 1.6230 0.0118

PWR28M36 1-3/4 1.7569 2.2530 2.250 0.0010 1.7500 0.0019 +/- 0.010 1.7609 2.2550 2.252 0.0050 1.7480 0.0119

PWR30M38 1-7/8 1.8820 2.3781 2.375 0.0011 1.8750 0.0019 +/- 0.010 1.8860 2.3801 2.377 0.0051 1.8730 0.0119

PWR32M40 2 2.0071 2.5031 2.500 0.0011 2.0000 0.0020 +/- 0.010 2.0111 2.5051 2.502 0.0051 1.9980 0.0120

PWR34M42 2-1/8 2.1333 2.6292 2.625 0.0012 2.1250 0.0021 +/- 0.010 2.1373 2.6312 2.628 0.0062 2.1230 0.0132

PWR36M44 2-1/4 2.2583 2.7542 2.750 0.0012 2.2500 0.0021 +/- 0.010 2.2623 2.7562 2.753 0.0062 2.2480 0.0131

PWR38M46 2-3/8 2.3835 2.8793 2.875 0.0013 2.3750 0.0022 +/- 0.010 2.3875 2.8813 2.878 0.0063 2.3730 0.0132

PWR40M48 2-1/2 2.5086 3.0043 3.000 0.0013 2.5000 0.0023 +/- 0.010 2.5126 3.0063 3.003 0.0063 2.4980 0.0133

PWR44M52 2-3/4 2.7588 3.2544 3.250 0.0014 2.7500 0.0024 +/- 0.010 2.7628 3.2564 3.253 0.0064 2.7470 0.0144

PWR48M56 3 3.0090 3.5045 3.500 0.0015 3.0000 0.0025 +/- 0.010 3.0130 3.5065 3.503 0.0065 2.9970 0.0145

PWR52M60 3-1/4 3.2592 3.7546 3.750 0.0016 3.2500 0.0026 +/- 0.010 3.2632 3.7566 3.753 0.0066 3.2470 0.0146

PWR56M64 3-1/2 3.5095 4.0047 4.000 0.0017 3.5000 0.0028 +/- 0.010 3.5135 4.0067 4.003 0.0067 3.4970 0.0148

PWR60M68 3-3/4 3.7597 4.2548 4.250 0.0018 3.7500 0.0029 +/- 0.010 3.7637 4.2568 4.253 0.0068 3.7470 0.0149

PWR64M72 4 4.0099 4.5049 4.500 0.0019 4.0000 0.0030 +/- 0.010 4.0139 4.5069 4.503 0.0069 3.9970 0.0150

PWR68M76 4-1/4 4.2601 4.7550 4.750 0.0020 4.2500 0.0031 +/- 0.010 4.2641 4.7570 4.753 0.0070 4.2470 0.0151

PWR72M80 4-1/2 4.5104 5.0051 5.000 0.0021 4.5000 0.0033 +/- 0.010 4.5144 5.0071 5.003 0.0071 4.4970 0.0153

PWR76M84 4-3/4 4.7606 5.2552 5.250 0.0022 4.7500 0.0034 +/- 0.010 4.7646 5.2572 5.253 0.0072 4.7470 0.0154

PWR80M88 5 5.0108 5.5053 5.500 0.0023 5.0000 0.0035 +/- 0.010 5.0148 5.5073 5.503 0.0073 4.9970 0.0155

bearIng Part nomInal Id od recommended Press recommended runnIng lengtH number Id HousIng bore fIt PIn dIameter clearance tolerance

Polylube inside selected outside length identification diameter liner diameter

PWr nominal m= mrP / e = eWs nominal x16 id x 16 g= glass taPe od x 16

tHe Polylube® bearIng Part number system



PWR08M16 1/2 0.5058 1.0025 1.000 0.0005 0.5000 0.0013 +/- 0.010 0.5088 1.0045 1.002 0.0045 0.4980 0.0103

PWR10M18 5/8 0.6309 1.1276 1.125 0.0005 0.6250 0.0013 +/- 0.010 0.6339 1.1296 1.127 0.0046 0.6230 0.0104

PWR12M20 3/4 0.7560 1.2526 1.250 0.0006 0.7500 0.0014 +/- 0.010 0.7590 1.2546 1.252 0.0046 0.7480 0.0104

PWR14M22 7/8 0.8811 1.3777 1.375 0.0006 0.8750 0.0014 +/- 0.010 0.8841 1.3797 1.377 0.0047 0.8730 0.0105

PWR16M24 1 1.0062 1.5027 1.500 0.0007 1.0000 0.0015 +/- 0.010 1.0092 1.5047 1.502 0.0047 0.9980 0.0105

PWR18M26 1-1/8 1.1314 1.6278 1.625 0.0007 1.1250 0.0016 +/- 0.010 1.1344 1.6298 1.627 0.0048 1.1230 0.0107

PWR20M28 1-1/4 1.2564 1.7528 1.750 0.0008 1.2500 0.0016 +/- 0.010 1.2594 1.7548 1.752 0.0048 1.2480 0.0106

PWR22M30 1-3/8 1.3816 1.8779 1.875 0.0008 1.3750 0.0017 +/- 0.010 1.3856 1.8799 1.877 0.0049 1.3730 0.0117

PWR24M32 1-1/2 1.5067 2.0029 2.000 0.0009 1.5000 0.0018 +/- 0.010 1.5107 2.0049 2.002 0.0049 1.4980 0.0118

PWR26M34 1-5/8 1.6318 2.1280 2.125 0.0009 1.6250 0.0018 +/- 0.010 1.6358 2.1300 2.127 0.0050 1.6230 0.0118

PWR28M36 1-3/4 1.7569 2.2530 2.250 0.0010 1.7500 0.0019 +/- 0.010 1.7609 2.2550 2.252 0.0050 1.7480 0.0119

PWR30M38 1-7/8 1.8820 2.3781 2.375 0.0011 1.8750 0.0019 +/- 0.010 1.8860 2.3801 2.377 0.0051 1.8730 0.0119

PWR32M40 2 2.0071 2.5031 2.500 0.0011 2.0000 0.0020 +/- 0.010 2.0111 2.5051 2.502 0.0051 1.9980 0.0120

PWR34M42 2-1/8 2.1333 2.6292 2.625 0.0012 2.1250 0.0021 +/- 0.010 2.1373 2.6312 2.628 0.0062 2.1230 0.0132

PWR36M44 2-1/4 2.2583 2.7542 2.750 0.0012 2.2500 0.0021 +/- 0.010 2.2623 2.7562 2.753 0.0062 2.2480 0.0131

PWR38M46 2-3/8 2.3835 2.8793 2.875 0.0013 2.3750 0.0022 +/- 0.010 2.3875 2.8813 2.878 0.0063 2.3730 0.0132

PWR40M48 2-1/2 2.5086 3.0043 3.000 0.0013 2.5000 0.0023 +/- 0.010 2.5126 3.0063 3.003 0.0063 2.4980 0.0133

PWR44M52 2-3/4 2.7588 3.2544 3.250 0.0014 2.7500 0.0024 +/- 0.010 2.7628 3.2564 3.253 0.0064 2.7470 0.0144

PWR48M56 3 3.0090 3.5045 3.500 0.0015 3.0000 0.0025 +/- 0.010 3.0130 3.5065 3.503 0.0065 2.9970 0.0145

PWR52M60 3-1/4 3.2592 3.7546 3.750 0.0016 3.2500 0.0026 +/- 0.010 3.2632 3.7566 3.753 0.0066 3.2470 0.0146

PWR56M64 3-1/2 3.5095 4.0047 4.000 0.0017 3.5000 0.0028 +/- 0.010 3.5135 4.0067 4.003 0.0067 3.4970 0.0148

PWR60M68 3-3/4 3.7597 4.2548 4.250 0.0018 3.7500 0.0029 +/- 0.010 3.7637 4.2568 4.253 0.0068 3.7470 0.0149

PWR64M72 4 4.0099 4.5049 4.500 0.0019 4.0000 0.0030 +/- 0.010 4.0139 4.5069 4.503 0.0069 3.9970 0.0150

PWR68M76 4-1/4 4.2601 4.7550 4.750 0.0020 4.2500 0.0031 +/- 0.010 4.2641 4.7570 4.753 0.0070 4.2470 0.0151

PWR72M80 4-1/2 4.5104 5.0051 5.000 0.0021 4.5000 0.0033 +/- 0.010 4.5144 5.0071 5.003 0.0071 4.4970 0.0153

PWR76M84 4-3/4 4.7606 5.2552 5.250 0.0022 4.7500 0.0034 +/- 0.010 4.7646 5.2572 5.253 0.0072 4.7470 0.0154

PWR80M88 5 5.0108 5.5053 5.500 0.0023 5.0000 0.0035 +/- 0.010 5.0148 5.5073 5.503 0.0073 4.9970 0.0155







PWR08M12 1/2 0.5058 0.7525 0.750 0.0005 0.5000 0.0013 +/- 0.010 0.5088 0.7545 0.752 0.0045 0.4980 0.0103

PWR10M14 5/8 0.6309 0.8776 0.875 0.0005 0.6250 0.0013 +/- 0.010 0.6339 0.8796 0.877 0.0046 0.6230 0.0104

PWR12M16 3/4 0.7560 1.0026 1.000 0.0006 0.7500 0.0014 +/- 0.010 0.7590 1.0046 1.002 0.0046 0.7480 0.0104

PWR14M18 7/8 0.8811 1.1277 1.125 0.0006 0.8750 0.0014 +/- 0.010 0.8841 1.1297 1.127 0.0047 0.8730 0.0105

PWR16M20 1 1.0062 1.2527 1.250 0.0007 1.0000 0.0015 +/- 0.010 1.0092 1.2547 1.252 0.0047 0.9980 0.0105

PWR18M22 1-1/8 1.1314 1.3778 1.375 0.0007 1.1250 0.0016 +/- 0.010 1.1344 1.3798 1.377 0.0048 1.1230 0.0107

PWR20M24 1-1/4 1.2564 1.5028 1.500 0.0008 1.2500 0.0016 +/- 0.010 1.2594 1.5048 1.502 0.0048 1.2480 0.0106

PWR22M26 1-3/8 1.3816 1.6279 1.625 0.0008 1.3750 0.0017 +/- 0.010 1.3856 1.6299 1.627 0.0049 1.3730 0.0117

PWR24M28 1-1/2 1.5067 1.7529 1.750 0.0009 1.5000 0.0018 +/- 0.010 1.5107 1.7549 1.752 0.0049 1.4980 0.0118

PWR26M30 1-5/8 1.6318 1.8780 1.875 0.0009 1.6250 0.0018 +/- 0.010 1.6358 1.8800 1.877 0.0050 1.6230 0.0118

PWR28M32 1-3/4 1.7569 2.0030 2.000 0.0010 1.7500 0.0019 +/- 0.010 1.7609 2.0050 2.002 0.0050 1.7480 0.0119

PWR30M34 1-7/8 1.8820 2.1281 2.125 0.0011 1.8750 0.0019 +/- 0.010 1.8860 2.1301 2.127 0.0051 1.8730 0.0119

PWR32M36 2 2.0071 2.2531 2.250 0.0011 2.0000 0.0020 +/- 0.010 2.0111 2.2551 2.252 0.0051 1.9980 0.0120

PWR34M38 2-1/8 2.1333 2.3792 2.375 0.0012 2.1250 0.0021 +/- 0.010 2.1373 2.3812 2.378 0.0062 2.1230 0.0132

PWR36M40 2-1/4 2.2583 2.5042 2.500 0.0012 2.2500 0.0021 +/- 0.010 2.2623 2.5062 2.503 0.0062 2.2480 0.0131

PWR38M42 2-3/8 2.3835 2.6293 2.625 0.0013 2.3750 0.0022 +/- 0.010 2.3875 2.6313 2.628 0.0063 2.3730 0.0132

PWR40M44 2-1/2 2.5086 2.7543 2.750 0.0013 2.5000 0.0023 +/- 0.010 2.5126 2.7563 2.753 0.0063 2.4980 0.0133

PWR44M48 2-3/4 2.7588 3.0044 3.000 0.0014 2.7500 0.0024 +/- 0.010 2.7628 3.0064 3.003 0.0064 2.7470 0.0144

PWR48M52 3 3.0090 3.2545 3.250 0.0015 3.0000 0.0025 +/- 0.010 3.0130 3.2565 3.253 0.0065 2.9970 0.0145

PWR52M56 3-1/4 3.2592 3.5046 3.500 0.0016 3.2500 0.0026 +/- 0.010 3.2632 3.5066 3.503 0.0066 3.2470 0.0146

PWR56M60 3-1/2 3.5095 3.7547 3.750 0.0017 3.5000 0.0028 +/- 0.010 3.5135 3.7567 3.753 0.0067 3.4970 0.0148

PWR60M64 3-3/4 3.7597 4.0048 4.000 0.0018 3.7500 0.0029 +/- 0.010 3.7637 4.0068 4.003 0.0068 3.7470 0.0149

PWR64M68 4 4.0099 4.2549 4.250 0.0019 4.0000 0.0030 +/- 0.010 4.0139 4.2569 4.253 0.0069 3.9970 0.0150

PWR68M72 4-1/4 4.2601 4.5050 4.500 0.0020 4.2500 0.0031 +/- 0.010 4.2641 4.5070 4.503 0.0070 4.2470 0.0151

PWR72M76 4-1/2 4.5104 4.7551 4.750 0.0021 4.5000 0.0033 +/- 0.010 4.5144 4.7571 4.753 0.0071 4.4970 0.0153

PWR76M80 4-3/4 4.7606 5.0052 5.000 0.0022 4.7500 0.0034 +/- 0.010 4.7646 5.0072 5.003 0.0072 4.7470 0.0154

PWR80M84 5 5.0108 5.2553 5.250 0.0023 5.0000 0.0035 +/- 0.010 5.0148 5.2573 5.253 0.0073 4.9970 0.0155





8

¼"" THin Wall diMensionsHex or square ID available as well as flange bearings and secondary machining. Most tooling available to make special sizes. ID’s from 20" down to .125". All measurements in inches.


PWR08M10 1/2 0.5058 0.6275 0.625 0.0005 0.5000 0.0013 +/- 0.010 0.5088 0.6295 0.627 0.0045 0.4980 0.0103

PWR10M12 5/8 0.6309 0.7526 0.750 0.0005 0.6250 0.0013 +/- 0.010 0.6339 0.7546 0.752 0.0046 0.6230 0.0104

PWR12M14 3/4 0.7560 0.8776 0.875 0.0006 0.7500 0.0014 +/- 0.010 0.7590 0.8796 0.877 0.0046 0.7480 0.0104

PWR14M16 7/8 0.8811 1.0027 1.000 0.0006 0.8750 0.0014 +/- 0.010 0.8841 1.0047 1.002 0.0047 0.8730 0.0105

PWR16M18 1 1.0062 1.1277 1.125 0.0007 1.0000 0.0015 +/- 0.010 1.0092 1.1297 1.127 0.0047 0.9980 0.0105

PWR18M20 1-1/8 1.1314 1.2528 1.250 0.0007 1.1250 0.0016 +/- 0.010 1.1344 1.2548 1.252 0.0048 1.1230 0.0107

PWR20M22 1-1/4 1.2564 1.3778 1.375 0.0008 1.2500 0.0016 +/- 0.010 1.2594 1.3798 1.377 0.0048 1.2480 0.0106

PWR22M24 1-3/8 1.3816 1.5029 1.500 0.0008 1.3750 0.0017 +/- 0.010 1.3856 1.5049 1.502 0.0049 1.3730 0.0117

PWR24M26 1-1/2 1.5067 1.6279 1.625 0.0009 1.5000 0.0018 +/- 0.010 1.5107 1.6299 1.627 0.0049 1.4980 0.0118

PWR26M28 1-5/8 1.6318 1.7530 1.750 0.0009 1.6250 0.0018 +/- 0.010 1.6358 1.7550 1.752 0.0050 1.6230 0.0118

PWR28M30 1-3/4 1.7569 1.8780 1.875 0.0010 1.7500 0.0019 +/- 0.010 1.7609 1.8800 1.877 0.0050 1.7480 0.0119

PWR30M32 1-7/8 1.8820 2.0031 2.000 0.0011 1.8750 0.0019 +/- 0.010 1.8860 2.0051 2.002 0.0051 1.8730 0.0119

PWR32M34 2 2.0071 2.1281 2.125 0.0011 2.0000 0.0020 +/- 0.010 2.0111 2.1301 2.127 0.0051 1.9980 0.0120





16

single sealExample:1PW-PWR16M26-12 (MRP Series Lined Bearing: 1.00" ID x 1.625" OD x 0.75" Long (with a polyurethane press-in wiper seal)


1PW-PWR08M18-XX 1/2 0.5058 1.1276 1.125 0.0006 0.5000 0.0012 1.0010 0.3125 0.5625 0.5088 1.1296 1.127 0.0046 0.4980 0.0103 1.0040

1PW-PWR10M20-XX 5/8 0.6309 1.2526 1.250 0.0006 0.6250 0.0013 1.1260 0.3125 0.7500 0.6339 1.2546 1.252 0.0046 0.6230 0.0103 1.1290

1PW-PWR12M22-XX 3/4 0.7560 1.3777 1.375 0.0007 0.7500 0.0013 1.2510 0.3750 0.8125 0.7590 1.3797 1.377 0.0047 0.7480 0.0104 1.2540

1PW-PWR14M24-XX 7/8 0.8811 1.5027 1.500 0.0007 0.8750 0.0014 1.3760 0.3750 0.9375 0.8841 1.5047 1.502 0.0047 0.8730 0.0104 1.3790

1PW-PWR16M26-XX 1 1.0062 1.6278 1.625 0.0008 1.0000 0.0014 1.5010 0.3750 1.0625 1.0092 1.6298 1.627 0.0048 0.9980 0.0105 1.5040

1PW-PWR18M28-XX 1 1/8 1.1314 1.7528 1.750 0.0008 1.1250 0.0016 1.6260 0.3750 1.1875 1.1344 1.7548 1.752 0.0048 1.1230 0.0106 1.6290

1PW-PWR20M30-XX 1 1/4 1.2564 1.8779 1.875 0.0009 1.2500 0.0015 1.7510 0.3750 1.3750 1.2594 1.8799 1.877 0.0049 1.2480 0.0106 1.7540

1PW-PWR22M32-XX 1 3/8 1.3816 2.0029 2.000 0.0009 1.3750 0.0017 1.8760 0.3750 1.5000 1.3856 2.0049 2.002 0.0049 1.3730 0.0117 1.8790

1PW-PWR24M34-XX 1 1/2 1.5067 2.1280 2.125 0.0010 1.5000 0.0018 2.0010 0.3750 1.6250 1.5107 2.1300 2.127 0.0049 1.4980 0.0117 2.0040

1PW-PWR26M36-XX 1 5/8 1.6318 2.2530 2.250 0.0010 1.6250 0.0018 2.1260 0.3750 1.8125 1.6358 2.2550 2.252 0.0050 1.6230 0.0118 2.1290

1PW-PWR28M38-XX 1 3/4 1.7569 2.3781 2.375 0.0011 1.7500 0.0019 2.2510 0.3750 2.0000 1.7609 2.3801 2.377 0.0050 1.7480 0.0118 2.2540

1PW-PWR30M40-XX 1 7/8 1.8820 2.5031 2.500 0.0011 1.8750 0.0019 2.3760 0.3750 2.0000 1.8860 2.5051 2.502 0.0051 1.8730 0.0119 2.3790

1PW-PWR32M42-XX 2 2.0071 2.6292 2.625 0.0011 2.0000 0.0010 2.5010 0.3750 2.1875 2.0111 2.6312 2.628 0.0061 1.9980 0.0119 2.5040

1PW-PWR34M44-XX 2 1/8 2.1333 2.7542 2.750 0.0012 2.1250 0.0021 2.6260 0.3750 2.1875 2.1373 2.7562 2.753 0.0062 2.1230 0.0131 2.6290

1PW-PWR36M46-XX 2 1/4 2.2583 2.8793 2.875 0.0013 2.2500 0.0021 2.7510 0.3750 2.3750 2.2623 2.8813 2.878 0.0063 2.2480 0.0130 2.7540

1PW-PWR38M48-XX 2 3/8 2.3835 3.0043 3.000 0.0013 2.3750 0.0022 2.8760 0.3750 2.5625 2.3875 3.0063 3.003 0.0063 2.3730 0.0132 2.8790

1PW-PWR40M50-XX 2 1/2 2.5086 3.1294 3.125 0.0014 2.5000 0.0022 3.0010 0.3750 2.7500 2.5126 3.1314 3.128 0.0064 2.4980 0.0132 3.0040

1PW-PWR44M54-XX 2 3/4 2.7588 3.3795 3.375 0.0015 2.7500 0.0023 3.2510 0.3750 3.1250 2.7628 3.3815 3.378 0.0065 2.7470 0.0143 3.2540

1PW-PWR48M58-XX 3 3.0090 3.6296 3.625 0.0016 3.0000 0.0024 3.5010 0.3750 3.5000 3.0130 3.6316 3.628 0.0066 2.9970 0.0144 3.5040

1PW-PWR52M62-XX 3 1/4 3.2592 3.8797 3.875 0.0017 3.2500 0.0025 3.7510 0.3750 3.9375 3.2632 3.8817 3.878 0.0067 3.2470 0.0145 3.7540

1PW-PWR56M66-XX 3 1/2 3.5095 4.1298 4.125 0.0018 3.5000 0.0027 4.0010 0.3750 3.9375 3.5135 4.1318 4.128 0.0068 3.4970 0.0147 4.0040

1PW-PWR60M74-XX 3 3/4 3.7597 4.6299 4.625 0.0019 3.7500 0.0029 4.5001 0.3750 4.3750 3.7637 4.6319 4.628 0.0069 3.7470 0.0149 4.5031

1PW-PWR64M76-XX 4 4.0099 4.7550 4.750 0.0019 4.0000 0.0030 4.6260 0.3750 4.6875 4.0139 4.7570 4.753 0.0069 3.9970 0.0149 4.6290

1PW-PWR68M80-XX 4 1/4 4.2601 5.0051 5.000 0.0021 4.2500 0.0031 4.8760 0.3750 5.1250 4.2641 5.0071 5.003 0.0071 4.2470 0.0150 4.8790

1PW-PWR72M84-XX 4 1/2 4.5104 5.2552 5.250 0.0022 4.5000 0.0032 5.1260 0.3750 5.5625 4.5144 5.2572 5.253 0.0072 4.4970 0.0153 5.1290

1PW-PWR76M88-XX 4 3/4 4.7606 5.5053 5.500 0.0023 4.7500 0.0034 5.3760 0.3750 6.0000 4.7646 5.5073 5.503 0.0072 4.7470 0.0153 5.3790

1PW-PWR80M92-XX 5 5.0108 5.7554 5.750 0.0023 5.0000 0.0034 5.6260 0.3750 6.5000 5.0148 5.7574 5.753 0.0073 4.9970 0.0155 5.6290

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe WIdtH maxImum bearIng number Id dIameter fIt dIameter clearance dIameter (+/-0.010) lengtH - 1 seal (+/-0.010)

PINDIAMETER

HOUSING

BEARING

BEARING LENGTHGROOVEWIDTH

BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SINGLE SEAL DOUBLE SEAL

PINDIAMETER

HOUSING

BEARING

BEARING LENGTHGROOVE WIDTH

BEARINGOD

BEARINGID

DOUBLE SEALWITH SHOULDERS

SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

SINGLE SEALWITH SHOULDER

SHOULDER WIDTH

Example:1PW-PWR32M44-40 (MRP Series Lined Bearing: 2.00" ID x 2.75" OD x 2.5" Long (with a polyurethane press-in wiper seal)


1PW-PWR08M20-XX 1/2 0.5058 1.2526 1.250 0.0006 0.5000 0.0012 1.0010 0.3125 1.0000 0.5088 1.2546 1.252 0.0046 0.4980 0.0102 1.0040

1PW-PWR10M22-XX 5/8 0.6309 1.3777 1.375 0.0007 0.6250 0.0012 1.1260 0.3125 1.1875 0.6339 1.3797 1.377 0.0047 0.6230 0.0103 1.1290

1PW-PWR12M24-XX 3/4 0.7560 1.5027 1.500 0.0007 0.7500 0.0013 1.2510 0.3750 1.4375 0.7590 1.5047 1.502 0.0047 0.7480 0.0103 1.2540

1PW-PWR14M26-XX 7/8 0.8811 1.6278 1.625 0.0008 0.8750 0.0013 1.3760 0.3750 1.6250 0.8841 1.6298 1.627 0.0048 0.8730 0.0104 1.3790

1PW-PWR16M28-XX 1 1.0062 1.7528 1.750 0.0008 1.0000 0.0014 1.5010 0.3750 1.8125 1.0092 1.7548 1.752 0.0048 0.9980 0.0104 1.5040

1PW-PWR18M30-XX 1 1/8 1.1314 1.8779 1.875 0.0009 1.1250 0.0015 1.6260 0.3750 2.0625 1.1344 1.8799 1.877 0.0049 1.1230 0.0106 1.6290

1PW-PWR20M32-XX 1 1/4 1.2564 2.0029 2.000 0.0009 1.2500 0.0015 1.7510 0.3750 2.3125 1.2594 2.0049 2.002 0.0049 1.2480 0.0105 1.7540

1PW-PWR22M34-XX 1 3/8 1.3816 2.1280 2.125 0.0010 1.3750 0.0017 1.8760 0.3750 2.5625 1.3856 2.1300 2.127 0.0049 1.3730 0.0116 1.8790

1PW-PWR24M36-XX 1 1/2 1.5067 2.2530 2.250 0.0010 1.5000 0.0017 2.0010 0.3750 2.8125 1.5107 2.2550 2.252 0.0050 1.4980 0.0117 2.0040

1PW-PWR26M38-XX 1 5/8 1.6318 2.3781 2.375 0.0011 1.6250 0.0018 2.1260 0.3750 3.1250 1.6358 2.3801 2.377 0.0050 1.6230 0.0117 2.1290

1PW-PWR28M40-XX 1 3/4 1.7569 2.5031 2.500 0.0011 1.7500 0.0018 2.2510 0.3750 3.4375 1.7609 2.5051 2.502 0.0051 1.7480 0.0118 2.2540

1PW-PWR30M42-XX 1 7/8 1.8820 2.6282 2.625 0.0001 1.8750 0.0019 2.3760 0.3750 3.4375 1.8860 2.6302 2.628 0.0051 1.8730 0.0129 2.3790

1PW-PWR32M44-XX 2 2.0071 2.7542 2.750 0.0012 2.0000 0.0009 2.5010 0.3750 3.7500 2.0111 2.7562 2.753 0.0062 1.9980 0.0119 2.5040

1PW-PWR34M46-XX 2 1/8 2.1333 2.8793 2.875 0.0013 2.1250 0.0021 2.6260 0.3750 3.7500 2.1373 2.8813 2.878 0.0063 2.1230 0.0130 2.6290

1PW-PWR36M48-XX 2 1/4 2.2583 3.0043 3.000 0.0013 2.2500 0.0020 2.7510 0.3750 4.0000 2.2623 3.0063 3.003 0.0063 2.2480 0.0130 2.7540

1PW-PWR38M50-XX 2 3/8 2.3835 3.1294 3.125 0.0014 2.3750 0.0021 2.8760 0.3750 4.3125 2.3875 3.1314 3.128 0.0064 2.3730 0.0131 2.8790

1PW-PWR40M52-XX 2 1/2 2.5086 3.2544 3.250 0.0014 2.5000 0.0022 3.0010 0.3750 4.6250 2.5126 3.2564 3.253 0.0064 2.4980 0.0132 3.0040

1PW-PWR44M56-XX 2 3/4 2.7588 3.5045 3.500 0.0015 2.7500 0.0023 3.2510 0.3750 5.2500 2.7628 3.5065 3.503 0.0065 2.7470 0.0143 3.2540

1PW-PWR48M60-XX 3 3.0090 3.7546 3.750 0.0016 3.0000 0.0024 3.5010 0.3750 5.9375 3.0130 3.7566 3.753 0.0066 2.9970 0.0144 3.5040

1PW-PWR52M64-XX 3 1/4 3.2592 4.0047 4.000 0.0017 3.2500 0.0025 3.7510 0.3750 6.6875 3.2632 4.0067 4.003 0.0067 3.2470 0.0145 3.7540

1PW-PWR56M68-XX 3 1/2 3.5095 4.2548 4.250 0.0018 3.5000 0.0027 4.0010 0.3750 6.9375 3.5135 4.2568 4.253 0.0068 3.4970 0.0147 4.0040

1PW-PWR60M76-XX 3 3/4 3.7597 4.7549 4.750 0.0019 3.7500 0.0028 4.5001 0.3750 7.4375 3.7637 4.7569 4.753 0.0069 3.7470 0.0148 4.5031

1PW-PWR64M78-XX 4 4.0099 4.8800 4.875 0.0020 4.0000 0.0029 4.6260 0.3750 8.1250 4.0139 4.8820 4.878 0.0070 3.9970 0.0149 4.6290

1PW-PWR68M82-XX 4 1/4 4.2601 5.1301 5.125 0.0021 4.2500 0.0030 4.8760 0.3750 8.8750 4.2641 5.1321 5.128 0.0071 4.2470 0.0150 4.8790

1PW-PWR72M86-XX 4 1/2 4.5104 5.3802 5.375 0.0022 4.5000 0.0032 5.1260 0.3750 9.6250 4.5144 5.3822 5.378 0.0072 4.4970 0.0152 5.1290

1PW-PWR76M90-XX 4 3/4 4.7606 5.6303 5.625 0.0023 4.7500 0.0033 5.3760 0.3750 10.3750 4.7646 5.6323 5.628 0.0073 4.7470 0.0153 5.3790

1PW-PWR80M94-XX 5 5.0108 5.8804 5.875 0.0024 5.0000 0.0034 5.6260 0.3750 11.1875 5.0148 5.8824 5.878 0.0074 4.9970 0.0154 5.6290

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe WIdtH maxImum bearIng number Id dIameter fIt dIameter clearance dIameter (+/-0.010) lengtH - 1 seal (+/-0.010)

single seal PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

Example: PWR16M26-20-2MC (MRP Series Lined Bearing: 1.00" ID x 1.625" OD x 1.25" Long (with two polyurethane press-in wiper seals)


2PW-PWR08M18-XX 1/2 0.5058 1.1276 1.125 0.0006 0.5000 0.0012 1.0010 0.3125 0.7500 0.5088 1.1296 1.127 0.0046 0.4980 0.0103 1.0040

2PW-PWR10M20-XX 5/8 0.6309 1.2526 1.250 0.0006 0.6250 0.0013 1.1260 0.3125 0.9375 0.6339 1.2546 1.252 0.0046 0.6230 0.0103 1.1290

2PW-PWR12M22-XX 3/4 0.7560 1.3777 1.375 0.0007 0.7500 0.0013 1.2510 0.3750 1.0000 0.7590 1.3797 1.377 0.0047 0.7480 0.0104 1.2540

2PW-PWR14M24-XX 7/8 0.8811 1.5027 1.500 0.0007 0.8750 0.0014 1.3760 0.3750 1.1250 0.8841 1.5047 1.502 0.0047 0.8730 0.0104 1.3790

2PW-PWR16M26-XX 1 1.0062 1.6278 1.625 0.0008 1.0000 0.0014 1.5010 0.3750 1.2500 1.0092 1.6298 1.627 0.0048 0.9980 0.0105 1.5040

2PW-PWR18M28-XX 1 1/8 1.1314 1.7528 1.750 0.0008 1.1250 0.0016 1.6260 0.3750 1.3750 1.1344 1.7548 1.752 0.0048 1.1230 0.0106 1.6290

2PW-PWR20M30-XX 1 1/4 1.2564 1.8779 1.875 0.0009 1.2500 0.0015 1.7510 0.3750 1.5625 1.2594 1.8799 1.877 0.0049 1.2480 0.0106 1.7540

2PW-PWR22M32-XX 1 3/8 1.3816 2.0029 2.000 0.0009 1.3750 0.0017 1.8760 0.3750 1.6875 1.3856 2.0049 2.002 0.0049 1.3730 0.0117 1.8790

2PW-PWR24M34-XX 1 1/2 1.5067 2.1280 2.125 0.0010 1.5000 0.0018 2.0010 0.3750 1.8125 1.5107 2.1300 2.127 0.0049 1.4980 0.0117 2.0040

2PW-PWR26M36-XX 1 5/8 1.6318 2.2530 2.250 0.0010 1.6250 0.0018 2.1260 0.3750 2.0000 1.6358 2.2550 2.252 0.0050 1.6230 0.0118 2.1290

2PW-PWR28M38-XX 1 3/4 1.7569 2.3781 2.375 0.0011 1.7500 0.0019 2.2510 0.3750 2.1875 1.7609 2.3801 2.377 0.0050 1.7480 0.0118 2.2540

2PW-PWR30M40-XX 1 7/8 1.8820 2.5031 2.500 0.0011 1.8750 0.0019 2.3760 0.3750 2.1875 1.8860 2.5051 2.502 0.0051 1.8730 0.0119 2.3790

2PW-PWR32M42-XX 2 2.0071 2.6292 2.625 0.0011 2.0000 0.0010 2.5010 0.3750 2.3750 2.0111 2.6312 2.628 0.0061 1.9980 0.0119 2.5040

2PW-PWR34M44-XX 2 1/8 2.1333 2.7542 2.750 0.0012 2.1250 0.0021 2.6260 0.3750 2.3750 2.1373 2.7562 2.753 0.0062 2.1230 0.0131 2.6290

2PW-PWR36M46-XX 2 1/4 2.2583 2.8793 2.875 0.0013 2.2500 0.0021 2.7510 0.3750 2.5625 2.2623 2.8813 2.878 0.0063 2.2480 0.0130 2.7540

2PW-PWR38M48-XX 2 3/8 2.3835 3.0043 3.000 0.0013 2.3750 0.0022 2.8760 0.3750 2.7500 2.3875 3.0063 3.003 0.0063 2.3730 0.0132 2.8790

2PW-PWR40M50-XX 2 1/2 2.5086 3.1294 3.125 0.0014 2.5000 0.0022 3.0010 0.3750 2.9375 2.5126 3.1314 3.128 0.0064 2.4980 0.0132 3.0040

2PW-PWR44M54-XX 2 3/4 2.7588 3.3795 3.375 0.0015 2.7500 0.0023 3.2510 0.3750 3.3125 2.7628 3.3815 3.378 0.0065 2.7470 0.0143 3.2540

2PW-PWR48M58-XX 3 3.0090 3.6296 3.625 0.0016 3.0000 0.0024 3.5010 0.3750 3.6875 3.0130 3.6316 3.628 0.0066 2.9970 0.0144 3.5040

2PW-PWR52M62-XX 3 1/4 3.2592 3.8797 3.875 0.0017 3.2500 0.0025 3.7510 0.3750 4.1250 3.2632 3.8817 3.878 0.0067 3.2470 0.0145 3.7540

2PW-PWR56M66-XX 3 1/2 3.5095 4.1298 4.125 0.0018 3.5000 0.0027 4.0010 0.3750 4.1250 3.5135 4.1318 4.128 0.0068 3.4970 0.0147 4.0040

2PW-PWR60M74-XX 3 3/4 3.7597 4.6299 4.625 0.0019 3.7500 0.0029 4.5001 0.3750 4.5625 3.7637 4.6319 4.628 0.0069 3.7470 0.0149 4.5031

2PW-PWR64M76-XX 4 4.0099 4.7550 4.750 0.0019 4.0000 0.0030 4.6260 0.3750 4.8750 4.0139 4.7570 4.753 0.0069 3.9970 0.0149 4.6290

2PW-PWR68M80-XX 4 1/4 4.2601 5.0051 5.000 0.0021 4.2500 0.0031 4.8760 0.3750 5.3125 4.2641 5.0071 5.003 0.0071 4.2470 0.0150 4.8790

2PW-PWR72M84-XX 4 1/2 4.5104 5.2552 5.250 0.0022 4.5000 0.0032 5.1260 0.3750 5.7500 4.5144 5.2572 5.253 0.0072 4.4970 0.0153 5.1290

2PW-PWR76M88-XX 4 3/4 4.7606 5.5053 5.500 0.0023 4.7500 0.0034 5.3760 0.3750 6.1875 4.7646 5.5073 5.503 0.0072 4.7470 0.0153 5.3790

2PW-PWR80M92-XX 5 5.0108 5.7554 5.750 0.0023 5.0000 0.0034 5.6260 0.3750 6.6875 5.0148 5.7574 5.753 0.0073 4.9970 0.0155 5.6290

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe WIdtH maxImum bearIng number Id dIameter fIt dIameter clearance dIameter (+/-0.010) lengtH - 2 seals (+/-0.010)

douBle seal PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

Example: PWR20M32-24-2MC (MRP Series Lined Bearing: 1.25" ID x 2.00" OD x 1.50" Long (with two polyurethane press-in wiper seals)


2PW-PWR08M20-XX 1/2 0.5058 1.2526 1.250 0.0006 0.5000 0.0012 1.0010 0.3125 1.1875 0.5088 1.2546 1.252 0.0046 0.4980 0.0102 1.0040

2PW-PWR10M22-XX 5/8 0.6309 1.3777 1.375 0.0007 0.6250 0.0012 1.1260 0.3125 1.3750 0.6339 1.3797 1.377 0.0047 0.6230 0.0103 1.1290

2PW-PWR12M24-XX 3/4 0.7560 1.5027 1.500 0.0007 0.7500 0.0013 1.2510 0.3750 1.6250 0.7590 1.5047 1.502 0.0047 0.7480 0.0103 1.2540

2PW-PWR14M26-XX 7/8 0.8811 1.6278 1.625 0.0008 0.8750 0.0013 1.3760 0.3750 1.8125 0.8841 1.6298 1.627 0.0048 0.8730 0.0104 1.3790

2PW-PWR16M28-XX 1 1.0062 1.7528 1.750 0.0008 1.0000 0.0014 1.5010 0.3750 2.0000 1.0092 1.7548 1.752 0.0048 0.9980 0.0104 1.5040

2PW-PWR18M30-XX 1 1/8 1.1314 1.8779 1.875 0.0009 1.1250 0.0015 1.6260 0.3750 2.2500 1.1344 1.8799 1.877 0.0049 1.1230 0.0106 1.6290

2PW-PWR20M32-XX 1 1/4 1.2564 2.0029 2.000 0.0009 1.2500 0.0015 1.7510 0.3750 2.5000 1.2594 2.0049 2.002 0.0049 1.2480 0.0105 1.7540

2PW-PWR22M34-XX 1 3/8 1.3816 2.1280 2.125 0.0010 1.3750 0.0017 1.8760 0.3750 2.7500 1.3856 2.1300 2.127 0.0049 1.3730 0.0116 1.8790

2PW-PWR24M36-XX 1 1/2 1.5067 2.2530 2.250 0.0010 1.5000 0.0017 2.0010 0.3750 3.0000 1.5107 2.2550 2.252 0.0050 1.4980 0.0117 2.0040

2PW-PWR26M38-XX 1 5/8 1.6318 2.3781 2.375 0.0011 1.6250 0.0018 2.1260 0.3750 3.3125 1.6358 2.3801 2.377 0.0050 1.6230 0.0117 2.1290

2PW-PWR28M40-XX 1 3/4 1.7569 2.5031 2.500 0.0011 1.7500 0.0018 2.2510 0.3750 3.6250 1.7609 2.5051 2.502 0.0051 1.7480 0.0118 2.2540

2PW-PWR30M42-XX 1 7/8 1.8820 2.6282 2.625 0.0001 1.8750 0.0019 2.3760 0.3750 3.6250 1.8860 2.6302 2.628 0.0051 1.8730 0.0129 2.3790

2PW-PWR32M44-XX 2 2.0071 2.7542 2.750 0.0012 2.0000 0.0009 2.5010 0.3750 3.9375 2.0111 2.7562 2.753 0.0062 1.9980 0.0119 2.5040

2PW-PWR34M46-XX 2 1/8 2.1333 2.8793 2.875 0.0013 2.1250 0.0021 2.6260 0.3750 3.9375 2.1373 2.8813 2.878 0.0063 2.1230 0.0130 2.6290

2PW-PWR36M48-XX 2 1/4 2.2583 3.0043 3.000 0.0013 2.2500 0.0020 2.7510 0.3750 4.1875 2.2623 3.0063 3.003 0.0063 2.2480 0.0130 2.7540

2PW-PWR38M50-XX 2 3/8 2.3835 3.1294 3.125 0.0014 2.3750 0.0021 2.8760 0.3750 4.5000 2.3875 3.1314 3.128 0.0064 2.3730 0.0131 2.8790

2PW-PWR40M52-XX 2 1/2 2.5086 3.2544 3.250 0.0014 2.5000 0.0022 3.0010 0.3750 4.8125 2.5126 3.2564 3.253 0.0064 2.4980 0.0132 3.0040

2PW-PWR44M56-XX 2 3/4 2.7588 3.5045 3.500 0.0015 2.7500 0.0023 3.2510 0.3750 5.4375 2.7628 3.5065 3.503 0.0065 2.7470 0.0143 3.2540

2PW-PWR48M60-XX 3 3.0090 3.7546 3.750 0.0016 3.0000 0.0024 3.5010 0.3750 6.1250 3.0130 3.7566 3.753 0.0066 2.9970 0.0144 3.5040

2PW-PWR52M64-XX 3 1/4 3.2592 4.0047 4.000 0.0017 3.2500 0.0025 3.7510 0.3750 6.8750 3.2632 4.0067 4.003 0.0067 3.2470 0.0145 3.7540

2PW-PWR56M68-XX 3 1/2 3.5095 4.2548 4.250 0.0018 3.5000 0.0027 4.0010 0.3750 7.1250 3.5135 4.2568 4.253 0.0068 3.4970 0.0147 4.0040

2PW-PWR60M76-XX 3 3/4 3.7597 4.7549 4.750 0.0019 3.7500 0.0028 4.5001 0.3750 7.6250 3.7637 4.7569 4.753 0.0069 3.7470 0.0148 4.5031

2PW-PWR64M78-XX 4 4.0099 4.8800 4.875 0.0020 4.0000 0.0029 4.6260 0.3750 8.3125 4.0139 4.8820 4.878 0.0070 3.9970 0.0149 4.6290

2PW-PWR68M82-XX 4 1/4 4.2601 5.1301 5.125 0.0021 4.2500 0.0030 4.8760 0.3750 9.0625 4.2641 5.1321 5.128 0.0071 4.2470 0.0150 4.8790

2PW-PWR72M86-XX 4 1/2 4.5104 5.3802 5.375 0.0022 4.5000 0.0032 5.1260 0.3750 9.8125 4.5144 5.3822 5.378 0.0072 4.4970 0.0152 5.1290

2PW-PWR76M90-XX 4 3/4 4.7606 5.6303 5.625 0.0023 4.7500 0.0033 5.3760 0.3750 10.5625 4.7646 5.6323 5.628 0.0073 4.7470 0.0153 5.3790

2PW-PWR80M94-XX 5 5.0108 5.8804 5.875 0.0024 5.0000 0.0034 5.6260 0.3750 11.3750 5.0148 5.8824 5.878 0.0074 4.9970 0.0154 5.6290

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe WIdtH maxImum bearIng number Id dIameter fIt dIameter clearance dIameter (+/-0.010) lengtH - 2 seals (+/-0.010)

douBle seal PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

single seal With shoulDerExample:1SW-PWR16M24-12 (MRP Series Lined Bearing: 1.00" ID x 1.50" OD x 0.75" Long (with a polyurethane snap-in wiper seal)


1SW-PWR08M14-XX 1/2 0.5058 0.8775 0.875 0.0005 0.5000 0.0013 0.7495 0.1240 0.6600 0.1000 0.5625 0.5088 0.8795 0.877 0.0045 0.4980 0.0103 0.7545 0.1280

1SW-PWR10M16-XX 5/8 0.6309 1.0026 1.000 0.0006 0.6250 0.0013 0.8746 0.1240 0.7850 0.1000 0.6875 0.6339 1.0046 1.002 0.0046 0.6230 0.0103 0.8796 0.1280

1SW-PWR12M20-XX 3/4 0.7560 1.2526 1.250 0.0006 0.7500 0.0014 1.1246 0.1870 0.9950 0.1250 0.8125 0.7590 1.2546 1.252 0.0046 0.7480 0.0104 1.1296 0.1910

1SW-PWR14M22-XX 7/8 0.8811 1.3777 1.375 0.0007 0.8750 0.0014 1.2497 0.1870 1.1200 0.1250 0.9375 0.8841 1.3797 1.377 0.0047 0.8730 0.0104 1.2547 0.1910

1SW-PWR16M24-XX 1 1.0062 1.5027 1.500 0.0007 1.0000 0.0015 1.3747 0.1870 1.2450 0.1250 1.1250 1.0092 1.5047 1.502 0.0047 0.9980 0.0105 1.3797 0.1910

1SW-PWR18M26-XX 1 1/8 1.1314 1.6278 1.625 0.0008 1.1250 0.0016 1.4998 0.1870 1.3700 0.1250 1.2500 1.1344 1.6298 1.627 0.0048 1.1230 0.0106 1.5048 0.1910

1SW-PWR20M28-XX 1 1/4 1.2564 1.7528 1.750 0.0008 1.2500 0.0016 1.6248 0.1870 1.4950 0.1250 1.4375 1.2594 1.7548 1.752 0.0048 1.2480 0.0106 1.6298 0.1910

1SW-PWR22M30-XX 1 3/8 1.3816 1.8779 1.875 0.0009 1.3750 0.0017 1.7499 0.1870 1.6200 0.1250 1.5625 1.3856 1.8799 1.877 0.0049 1.3730 0.0117 1.7549 0.1910

1SW-PWR24M32-XX 1 1/2 1.5067 2.0029 2.000 0.0009 1.5000 0.0018 1.8749 0.1870 1.7450 0.1250 1.8125 1.5107 2.0049 2.002 0.0049 1.4980 0.0118 1.8799 0.1910

1SW-PWR26M34-XX 1 5/8 1.6318 2.1280 2.125 0.0010 1.6250 0.0018 2.0000 0.1870 1.8700 0.1250 2.0000 1.6358 2.1300 2.127 0.0050 1.6230 0.0118 2.0050 0.1910

1SW-PWR28M36-XX 1 3/4 1.7569 2.2530 2.250 0.0010 1.7500 0.0019 2.1250 0.1870 1.9950 0.1250 2.0000 1.7609 2.2550 2.252 0.0050 1.7480 0.0119 2.1300 0.1910

1SW-PWR30M38-XX 1 7/8 1.8820 2.3781 2.375 0.0011 1.8750 0.0019 2.2501 0.1870 2.1200 0.1250 2.1875 1.8860 2.3801 2.377 0.0051 1.8730 0.0119 2.2551 0.1910

1SW-PWR32M42-XX 2 2.0071 2.6292 2.625 0.0012 2.0000 0.0009 2.5001 0.2490 2.3270 0.1875 2.1875 2.0111 2.6312 2.628 0.0062 1.9980 0.0119 2.5051 0.2530

1SW-PWR34M44-XX 2 1/8 2.1333 2.7542 2.750 0.0012 2.1250 0.0021 2.6257 0.2490 2.4520 0.1875 2.3750 2.1373 2.7562 2.753 0.0062 2.1230 0.0131 2.6304 0.2530

1SW-PWR36M46-XX 2 1/4 2.2583 2.8793 2.875 0.0013 2.2500 0.0020 2.7507 0.2490 2.5770 0.1875 2.3750 2.2623 2.8813 2.878 0.0063 2.2480 0.0130 2.7555 0.2530

1SW-PWR38M48-XX 2 3/8 2.3835 3.0043 3.000 0.0013 2.3750 0.0022 2.8758 0.2490 2.7020 0.1875 2.5625 2.3875 3.0063 3.003 0.0063 2.3730 0.0132 2.8805 0.2530

1SW-PWR40M50-XX 2 1/2 2.5086 3.1294 3.125 0.0014 2.5000 0.0022 3.0008 0.2490 2.8270 0.1875 2.6875 2.5126 3.1314 3.128 0.0064 2.4980 0.0132 3.0056 0.2530

1SW-PWR44M54-XX 2 3/4 2.7588 3.3795 3.375 0.0015 2.7500 0.0023 3.2509 0.2490 3.0770 0.1875 3.0625 2.7628 3.3815 3.378 0.0065 2.7470 0.0143 3.2557 0.2530

1SW-PWR48M58-XX 3 3.0090 3.6296 3.625 0.0016 3.0000 0.0024 3.5010 0.2490 3.3270 0.1875 3.5000 3.0130 3.6316 3.628 0.0066 2.9970 0.0144 3.5058 0.2530

1SW-PWR52M62-XX 3 1/4 3.2592 3.8797 3.875 0.0017 3.2500 0.0025 3.7511 0.2490 3.5770 0.1875 3.8750 3.2632 3.8817 3.878 0.0067 3.2470 0.0145 3.7559 0.2530

1SW-PWR56M66-XX 3 1/2 3.5095 4.1298 4.125 0.0018 3.5000 0.0027 4.0012 0.2490 3.8270 0.1875 4.3125 3.5135 4.1318 4.128 0.0068 3.4970 0.0147 4.0060 0.2530

1SW-PWR60M70-XX 3 3/4 3.7597 4.3799 4.375 0.0019 3.7500 0.0028 4.2513 0.2490 4.0770 0.1875 4.7500 3.7637 4.3819 4.378 0.0069 3.7470 0.0148 4.2561 0.2530

1SW-PWR64M74-XX 4 4.0099 4.6300 4.625 0.0020 4.0000 0.0029 4.5014 0.2490 4.3270 0.1875 5.0000 4.0139 4.6320 4.628 0.0070 3.9970 0.0149 4.5062 0.2530

1SW-PWR68M78-XX 4 1/4 4.2601 4.8801 4.875 0.0021 4.2500 0.0030 4.7515 0.2490 4.5770 0.1875 5.2500 4.2641 4.8821 4.878 0.0071 4.2470 0.0150 4.7563 0.2530

1SW-PWR72M86-XX 4 1/2 4.5104 5.3802 5.375 0.0022 4.5000 0.0032 5.2516 0.3740 4.9930 0.2500 5.3750 4.5144 5.3822 5.378 0.0072 4.4970 0.0152 5.2564 0.3780

1SW-PWR76M90-XX 4 3/4 4.7606 5.6303 5.625 0.0023 4.7500 0.0033 5.5017 0.3740 5.2430 0.2500 5.7500 4.7646 5.6323 5.628 0.0073 4.7470 0.0153 5.5065 0.3780

1SW-PWR80M94-XX 5 5.0108 5.8804 5.875 0.0024 5.0000 0.0034 5.7518 0.3740 5.4930 0.2500 5.8125 5.0148 5.8824 5.878 0.0074 4.9970 0.0154 5.7566 0.3780

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe sHoulder sHoulder maxImum number Id dIameter fIt dIameter clearance dIameter WIdtH dIameter WIdtH bearIng lengtH (+/-0.010) (+/-0.010) (+/-0.010) 1 seal (+/-0.010)

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

single seal With shoulDerExample:1SW-PWR16M26-24 (MRP Series Lined Bearing: 1.00" ID x 1.625" OD x 1.50" Long (with a polyurethane snap-in wiper seal)


1SW-PWR08M16-XX 1/2 0.5058 1.0026 1.000 0.0006 0.5000 0.0012 0.7495 0.1240 0.6600 0.1000 0.9375 0.5088 1.0046 1.002 0.0046 0.4980 0.0102 0.7545 0.1280

1SW-PWR10M18-XX 5/8 0.6309 1.1276 1.125 0.0006 0.6250 0.0013 0.8746 0.1240 0.7850 0.1000 1.1250 0.6339 1.1296 1.127 0.0046 0.6230 0.0103 0.8796 0.1280

1SW-PWR12M22-XX 3/4 0.7560 1.3777 1.375 0.0007 0.7500 0.0013 1.1246 0.1870 0.9950 0.1250 1.3750 0.7590 1.3797 1.377 0.0047 0.7480 0.0103 1.1296 0.1910

1SW-PWR14M24-XX 7/8 0.8811 1.5027 1.500 0.0007 0.8750 0.0014 1.2497 0.1870 1.1200 0.1250 1.6250 0.8841 1.5047 1.502 0.0047 0.8730 0.0104 1.2547 0.1910

1SW-PWR16M26-XX 1 1.0062 1.6278 1.625 0.0008 1.0000 0.0014 1.3747 0.1870 1.2450 0.1250 1.8750 1.0092 1.6298 1.627 0.0048 0.9980 0.0104 1.3797 0.1910

1SW-PWR18M28-XX 1 1/8 1.1314 1.7528 1.750 0.0008 1.1250 0.0016 1.4998 0.1870 1.3700 0.1250 2.1250 1.1344 1.7548 1.752 0.0048 1.1230 0.0106 1.5048 0.1910

1SW-PWR20M30-XX 1 1/4 1.2564 1.8779 1.875 0.0009 1.2500 0.0015 1.6248 0.1870 1.4950 0.1250 2.3750 1.2594 1.8799 1.877 0.0049 1.2480 0.0105 1.6298 0.1910

1SW-PWR22M32-XX 1 3/8 1.3816 2.0029 2.000 0.0009 1.3750 0.0017 1.7499 0.1870 1.6200 0.1250 2.6875 1.3856 2.0049 2.002 0.0049 1.3730 0.0117 1.7549 0.1910

1SW-PWR24M34-XX 1 1/2 1.5067 2.1280 2.125 0.0010 1.5000 0.0017 1.8749 0.1870 1.7450 0.1250 3.0000 1.5107 2.1300 2.127 0.0050 1.4980 0.0117 1.8799 0.1910

1SW-PWR26M36-XX 1 5/8 1.6318 2.2530 2.250 0.0010 1.6250 0.0018 2.0000 0.1870 1.8700 0.1250 3.3125 1.6358 2.2550 2.252 0.0050 1.6230 0.0118 2.0050 0.1910

1SW-PWR28M38-XX 1 3/4 1.7569 2.3781 2.375 0.0011 1.7500 0.0018 2.1250 0.1870 1.9950 0.1250 3.4375 1.7609 2.3801 2.377 0.0051 1.7480 0.0118 2.1300 0.1910

1SW-PWR30M40-XX 1 7/8 1.8820 2.5041 2.500 0.0021 1.8750 0.0009 2.2501 0.1870 2.1200 0.1250 3.4375 1.8860 2.5061 2.502 0.0061 1.8730 0.0109 2.2551 0.1910

1SW-PWR32M44-XX 2 2.0071 2.7542 2.750 0.0012 2.0000 0.0009 2.5001 0.2490 2.3270 0.1875 3.6250 2.0111 2.7562 2.753 0.0062 1.9980 0.0119 2.5051 0.2530

1SW-PWR34M46-XX 2 1/8 2.1333 2.8793 2.875 0.0013 2.1250 0.0020 2.6257 0.2490 2.4520 0.1875 3.6875 2.1373 2.8813 2.878 0.0063 2.1230 0.0130 2.6304 0.2530

1SW-PWR36M48-XX 2 1/4 2.2583 3.0043 3.000 0.0013 2.2500 0.0020 2.7507 0.2490 2.5770 0.1875 4.0000 2.2623 3.0063 3.003 0.0063 2.2480 0.0130 2.7555 0.2530

1SW-PWR38M50-XX 2 3/8 2.3835 3.1294 3.125 0.0014 2.3750 0.0021 2.8758 0.2490 2.7020 0.1875 4.3125 2.3875 3.1314 3.128 0.0064 2.3730 0.0131 2.8805 0.2530

1SW-PWR40M52-XX 2 1/2 2.5086 3.2544 3.250 0.0014 2.5000 0.0022 3.0008 0.2490 2.8270 0.1875 4.6250 2.5126 3.2564 3.253 0.0064 2.4980 0.0132 3.0056 0.2530

1SW-PWR44M56-XX 2 3/4 2.7588 3.5045 3.500 0.0015 2.7500 0.0023 3.2509 0.2490 3.0770 0.1875 5.2500 2.7628 3.5065 3.503 0.0065 2.7470 0.0143 3.2557 0.2530

1SW-PWR48M60-XX 3 3.0090 3.7546 3.750 0.0016 3.0000 0.0024 3.5010 0.2490 3.3270 0.1875 5.9375 3.0130 3.7566 3.753 0.0066 2.9970 0.0144 3.5058 0.2530

1SW-PWR52M64-XX 3 1/4 3.2592 4.0047 4.000 0.0017 3.2500 0.0025 3.7511 0.2490 3.5770 0.1875 6.6875 3.2632 4.0067 4.003 0.0067 3.2470 0.0145 3.7559 0.2530

1SW-PWR56M68-XX 3 1/2 3.5095 4.2548 4.250 0.0018 3.5000 0.0027 4.0012 0.2490 3.8270 0.1875 7.3750 3.5135 4.2568 4.253 0.0068 3.4970 0.0147 4.0060 0.2530

1SW-PWR60M72-XX 3 3/4 3.7597 4.5049 4.500 0.0019 3.7500 0.0028 4.2513 0.2490 4.0770 0.1875 8.1875 3.7637 4.5069 4.503 0.0069 3.7470 0.0148 4.2561 0.2530

1SW-PWR64M76-XX 4 4.0099 4.7550 4.750 0.0020 4.0000 0.0029 4.5014 0.2490 4.3270 0.1875 8.7500 4.0139 4.7570 4.753 0.0070 3.9970 0.0149 4.5062 0.2530

1SW-PWR68M80-XX 4 1/4 4.2601 5.0051 5.000 0.0021 4.2500 0.0030 4.7515 0.2490 4.5770 0.1875 8.9375 4.2641 5.0071 5.003 0.0071 4.2470 0.0150 4.7563 0.2530

1SW-PWR72M88-XX 4 1/2 4.5104 5.5053 5.500 0.0023 4.5000 0.0031 5.2516 0.3740 4.9930 0.2500 9.4375 4.5144 5.5073 5.503 0.0073 4.4970 0.0151 5.2564 0.3780

1SW-PWR76M92-XX 4 3/4 4.7606 5.7554 5.750 0.0024 4.7500 0.0032 5.5017 0.3740 5.2430 0.2500 9.7500 4.7646 5.7574 5.753 0.0074 4.7470 0.0152 5.5065 0.3780

1SW-PWR80M96-XX 5 5.0108 6.0055 6.000 0.0025 5.0000 0.0033 5.7518 0.3740 5.4930 0.2500 10.1250 5.0148 6.0075 6.003 0.0075 4.9970 0.0153 5.7566 0.3780

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe sHoulder sHoulder maxImum number Id dIameter fIt dIameter clearance dIameter WIdtH dIameter WIdtH bearIng lengtH (+/-0.010) (+/-0.010) (+/-0.010) 1 seal (+/-0.010)

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

douBle seal With shoulDersExample:2SW-PWR20M28-24 (MRP Series Lined Bearing: 1.25" ID x 1.75" OD x 1.5" Long (with two polyurethane snap-in wiper seals)


2SW-PWR08M14-XX 1/2 0.5058 0.8775 0.875 0.0005 0.5000 0.0013 0.7495 0.1240 0.6600 0.1000 0.6875 0.5088 0.8795 0.877 0.0045 0.4980 0.0103 0.7545 0.1280

2SW-PWR10M16-XX 5/8 0.6309 1.0026 1.000 0.0006 0.6250 0.0013 0.8746 0.1240 0.7850 0.1000 0.8125 0.6339 1.0046 1.002 0.0046 0.6230 0.0103 0.8796 0.1280

2SW-PWR12M20-XX 3/4 0.7560 1.2526 1.250 0.0006 0.7500 0.0014 1.1246 0.1870 0.9950 0.1250 1.0000 0.7590 1.2546 1.252 0.0046 0.7480 0.0104 1.1296 0.1910

2SW-PWR14M22-XX 7/8 0.8811 1.3777 1.375 0.0007 0.8750 0.0014 1.2497 0.1870 1.1200 0.1250 1.1250 0.8841 1.3797 1.377 0.0047 0.8730 0.0104 1.2547 0.1910

2SW-PWR16M24-XX 1 1.0062 1.5027 1.500 0.0007 1.0000 0.0015 1.3747 0.1870 1.2450 0.1250 1.2500 1.0092 1.5047 1.502 0.0047 0.9980 0.0105 1.3797 0.1910

2SW-PWR18M26-XX 1 1/8 1.1314 1.6278 1.625 0.0008 1.1250 0.0016 1.4998 0.1870 1.3700 0.1250 1.4375 1.1344 1.6298 1.627 0.0048 1.1230 0.0106 1.5048 0.1910

2SW-PWR20M28-XX 1 1/4 1.2564 1.7528 1.750 0.0008 1.2500 0.0016 1.6248 0.1870 1.4950 0.1250 1.5625 1.2594 1.7548 1.752 0.0048 1.2480 0.0106 1.6298 0.1910

2SW-PWR22M30-XX 1 3/8 1.3816 1.8779 1.875 0.0009 1.3750 0.0017 1.7499 0.1870 1.6200 0.1250 1.7500 1.3856 1.8799 1.877 0.0049 1.3730 0.0117 1.7549 0.1910

2SW-PWR24M32-XX 1 1/2 1.5067 2.0029 2.000 0.0009 1.5000 0.0018 1.8749 0.1870 1.7450 0.1250 1.9375 1.5107 2.0049 2.002 0.0049 1.4980 0.0118 1.8799 0.1910

2SW-PWR26M34-XX 1 5/8 1.6318 2.1280 2.125 0.0010 1.6250 0.0018 2.0000 0.1870 1.8700 0.1250 2.1250 1.6358 2.1300 2.127 0.0050 1.6230 0.0118 2.0050 0.1910

2SW-PWR28M36-XX 1 3/4 1.7569 2.2530 2.250 0.0010 1.7500 0.0019 2.1250 0.1870 1.9950 0.1250 2.2500 1.7609 2.2550 2.252 0.0050 1.7480 0.0119 2.1300 0.1910

2SW-PWR30M38-XX 1 7/8 1.8820 2.3781 2.375 0.0011 1.8750 0.0019 2.2501 0.1870 2.1200 0.1250 2.3750 1.8860 2.3801 2.377 0.0051 1.8730 0.0119 2.2551 0.1910

2SW-PWR32M42-XX 2 2.0071 2.6292 2.625 0.0012 2.0000 0.0009 2.5001 0.2490 2.3270 0.1875 2.4375 2.0111 2.6312 2.628 0.0062 1.9980 0.0119 2.5051 0.2530

2SW-PWR34M44-XX 2 1/8 2.1333 2.7542 2.750 0.0012 2.1250 0.0021 2.6257 0.2490 2.4520 0.1875 2.5625 2.1373 2.7562 2.753 0.0062 2.1230 0.0131 2.6304 0.2530

2SW-PWR36M46-XX 2 1/4 2.2583 2.8793 2.875 0.0013 2.2500 0.0020 2.7507 0.2490 2.5770 0.1875 2.5625 2.2623 2.8813 2.878 0.0063 2.2480 0.0130 2.7555 0.2530

2SW-PWR38M48-XX 2 3/8 2.3835 3.0043 3.000 0.0013 2.3750 0.0022 2.8758 0.2490 2.7020 0.1875 2.7500 2.3875 3.0063 3.003 0.0063 2.3730 0.0132 2.8805 0.2530

2SW-PWR40M50-XX 2 1/2 2.5086 3.1294 3.125 0.0014 2.5000 0.0022 3.0008 0.2490 2.8270 0.1875 2.9375 2.5126 3.1314 3.128 0.0064 2.4980 0.0132 3.0056 0.2530

2SW-PWR44M54-XX 2 3/4 2.7588 3.3795 3.375 0.0015 2.7500 0.0023 3.2509 0.2490 3.0770 0.1875 3.3125 2.7628 3.3815 3.378 0.0065 2.7470 0.0143 3.2557 0.2530

2SW-PWR48M58-XX 3 3.0090 3.6296 3.625 0.0016 3.0000 0.0024 3.5010 0.2490 3.3270 0.1875 3.6875 3.0130 3.6316 3.628 0.0066 2.9970 0.0144 3.5058 0.2530

2SW-PWR52M62-XX 3 1/4 3.2592 3.8797 3.875 0.0017 3.2500 0.0025 3.7511 0.2490 3.5770 0.1875 4.1250 3.2632 3.8817 3.878 0.0067 3.2470 0.0145 3.7559 0.2530

2SW-PWR56M66-XX 3 1/2 3.5095 4.1298 4.125 0.0018 3.5000 0.0027 4.0012 0.2490 3.8270 0.1875 4.5625 3.5135 4.1318 4.128 0.0068 3.4970 0.0147 4.0060 0.2530

2SW-PWR60M70-XX 3 3/4 3.7597 4.3799 4.375 0.0019 3.7500 0.0028 4.2513 0.2490 4.0770 0.1875 5.0000 3.7637 4.3819 4.378 0.0069 3.7470 0.0148 4.2561 0.2530

2SW-PWR64M74-XX 4 4.0099 4.6300 4.625 0.0020 4.0000 0.0029 4.5014 0.2490 4.3270 0.1875 5.3125 4.0139 4.6320 4.628 0.0070 3.9970 0.0149 4.5062 0.2530

2SW-PWR68M78-XX 4 1/4 4.2601 4.8801 4.875 0.0021 4.2500 0.0030 4.7515 0.2490 4.5770 0.1875 5.4375 4.2641 4.8821 4.878 0.0071 4.2470 0.0150 4.7563 0.2530

2SW-PWR72M86-XX 4 1/2 4.5104 5.3802 5.375 0.0022 4.5000 0.0032 5.2516 0.3740 4.9930 0.2500 5.6875 4.5144 5.3822 5.378 0.0072 4.4970 0.0152 5.2564 0.3780

2SW-PWR76M90-XX 4 3/4 4.7606 5.6303 5.625 0.0023 4.7500 0.0033 5.5017 0.3740 5.2430 0.2500 5.9375 4.7646 5.6323 5.628 0.0073 4.7470 0.0153 5.5065 0.3780

2SW-PWR80M94-XX 5 5.0108 5.8804 5.875 0.0024 5.0000 0.0034 5.7518 0.3740 5.4930 0.2500 6.1250 5.0148 5.8824 5.878 0.0074 4.9970 0.0154 5.7566 0.3780

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe sHoulder sHoulder maxImum number Id dIameter fIt dIameter clearance dIameter WIdtH dIameter WIdtH bearIng lengtH (+/-0.010) (+/-0.010) (+/-0.010) 2 seals (+/-0.010)

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

douBle seal With shoulDersExample:2SW-PWR16M26-20 (MRP Series Lined Bearing: 1.00" ID x 1.625" OD x 1.25" Long (with two polyurethane snap-in wiper seals)


2SW-PWR08M16-XX 1/2 0.5058 1.0026 1.000 0.0006 0.5000 0.0012 0.7495 0.1240 0.6600 0.1000 1.0000 0.5088 1.0046 1.002 0.0046 0.4980 0.0102 0.7545 0.1280

2SW-PWR10M18-XX 5/8 0.6309 1.1276 1.125 0.0006 0.6250 0.0013 0.8746 0.1240 0.7850 0.1000 1.2500 0.6339 1.1296 1.127 0.0046 0.6230 0.0103 0.8796 0.1280

2SW-PWR12M22-XX 3/4 0.7560 1.3777 1.375 0.0007 0.7500 0.0013 1.1246 0.1870 0.9950 0.1250 1.5625 0.7590 1.3797 1.377 0.0047 0.7480 0.0103 1.1296 0.1910

2SW-PWR14M24-XX 7/8 0.8811 1.5027 1.500 0.0007 0.8750 0.0014 1.2497 0.1870 1.1200 0.1250 1.7500 0.8841 1.5047 1.502 0.0047 0.8730 0.0104 1.2547 0.1910

2SW-PWR16M26-XX 1 1.0062 1.6278 1.625 0.0008 1.0000 0.0014 1.3747 0.1870 1.2450 0.1250 2.0000 1.0092 1.6298 1.627 0.0048 0.9980 0.0104 1.3797 0.1910

2SW-PWR18M28-XX 1 1/8 1.1314 1.7528 1.750 0.0008 1.1250 0.0016 1.4998 0.1870 1.3700 0.1250 2.3125 1.1344 1.7548 1.752 0.0048 1.1230 0.0106 1.5048 0.1910

2SW-PWR20M30-XX 1 1/4 1.2564 1.8779 1.875 0.0009 1.2500 0.0015 1.6248 0.1870 1.4950 0.1250 2.5625 1.2594 1.8799 1.877 0.0049 1.2480 0.0105 1.6298 0.1910

2SW-PWR22M32-XX 1 3/8 1.3816 2.0029 2.000 0.0009 1.3750 0.0017 1.7499 0.1870 1.6200 0.1250 2.8750 1.3856 2.0049 2.002 0.0049 1.3730 0.0117 1.7549 0.1910

2SW-PWR24M34-XX 1 1/2 1.5067 2.1280 2.125 0.0010 1.5000 0.0017 1.8749 0.1870 1.7450 0.1250 3.1250 1.5107 2.1300 2.127 0.0050 1.4980 0.0117 1.8799 0.1910

2SW-PWR26M36-XX 1 5/8 1.6318 2.2530 2.250 0.0010 1.6250 0.0018 2.0000 0.1870 1.8700 0.1250 3.5000 1.6358 2.2550 2.252 0.0050 1.6230 0.0118 2.0050 0.1910

2SW-PWR28M38-XX 1 3/4 1.7569 2.3781 2.375 0.0011 1.7500 0.0018 2.1250 0.1870 1.9950 0.1250 3.5625 1.7609 2.3801 2.377 0.0051 1.7480 0.0118 2.1300 0.1910

2SW-PWR30M40-XX 1 7/8 1.8820 2.5041 2.500 0.0021 1.8750 0.0009 2.2501 0.1870 2.1200 0.1250 3.6875 1.8860 2.5061 2.502 0.0061 1.8730 0.0109 2.2551 0.1910

2SW-PWR32M44-XX 2 2.0071 2.7542 2.750 0.0012 2.0000 0.0009 2.5001 0.2490 2.3270 0.1875 3.8125 2.0111 2.7562 2.753 0.0062 1.9980 0.0119 2.5051 0.2530

2SW-PWR34M46-XX 2 1/8 2.1333 2.8793 2.875 0.0013 2.1250 0.0020 2.6257 0.2490 2.4520 0.1875 3.9375 2.1373 2.8813 2.878 0.0063 2.1230 0.0130 2.6304 0.2530

2SW-PWR36M48-XX 2 1/4 2.2583 3.0043 3.000 0.0013 2.2500 0.0020 2.7507 0.2490 2.5770 0.1875 4.2500 2.2623 3.0063 3.003 0.0063 2.2480 0.0130 2.7555 0.2530

2SW-PWR38M50-XX 2 3/8 2.3835 3.1294 3.125 0.0014 2.3750 0.0021 2.8758 0.2490 2.7020 0.1875 4.5000 2.3875 3.1314 3.128 0.0064 2.3730 0.0131 2.8805 0.2530

2SW-PWR40M52-XX 2 1/2 2.5086 3.2544 3.250 0.0014 2.5000 0.0022 3.0008 0.2490 2.8270 0.1875 4.8750 2.5126 3.2564 3.253 0.0064 2.4980 0.0132 3.0056 0.2530

2SW-PWR44M56-XX 2 3/4 2.7588 3.5045 3.500 0.0015 2.7500 0.0023 3.2509 0.2490 3.0770 0.1875 5.5000 2.7628 3.5065 3.503 0.0065 2.7470 0.0143 3.2557 0.2530

2SW-PWR48M60-XX 3 3.0090 3.7546 3.750 0.0016 3.0000 0.0024 3.5010 0.2490 3.3270 0.1875 6.1875 3.0130 3.7566 3.753 0.0066 2.9970 0.0144 3.5058 0.2530

2SW-PWR52M64-XX 3 1/4 3.2592 4.0047 4.000 0.0017 3.2500 0.0025 3.7511 0.2490 3.5770 0.1875 6.8750 3.2632 4.0067 4.003 0.0067 3.2470 0.0145 3.7559 0.2530

2SW-PWR56M68-XX 3 1/2 3.5095 4.2548 4.250 0.0018 3.5000 0.0027 4.0012 0.2490 3.8270 0.1875 7.6250 3.5135 4.2568 4.253 0.0068 3.4970 0.0147 4.0060 0.2530

2SW-PWR60M72-XX 3 3/4 3.7597 4.5049 4.500 0.0019 3.7500 0.0028 4.2513 0.2490 4.0770 0.1875 8.3750 3.7637 4.5069 4.503 0.0069 3.7470 0.0148 4.2561 0.2530

2SW-PWR64M76-XX 4 4.0099 4.7550 4.750 0.0020 4.0000 0.0029 4.5014 0.2490 4.3270 0.1875 9.0625 4.0139 4.7570 4.753 0.0070 3.9970 0.0149 4.5062 0.2530

2SW-PWR68M80-XX 4 1/4 4.2601 5.0051 5.000 0.0021 4.2500 0.0030 4.7515 0.2490 4.5770 0.1875 9.1875 4.2641 5.0071 5.003 0.0071 4.2470 0.0150 4.7563 0.2530

2SW-PWR72M88-XX 4 1/2 4.5104 5.5053 5.500 0.0023 4.5000 0.0031 5.2516 0.3740 4.9930 0.2500 9.7500 4.5144 5.5073 5.503 0.0073 4.4970 0.0151 5.2564 0.3780

2SW-PWR76M92-XX 4 3/4 4.7606 5.7554 5.750 0.0024 4.7500 0.0032 5.5017 0.3740 5.2430 0.2500 10.0000 4.7646 5.7574 5.753 0.0074 4.7470 0.0152 5.5065 0.3780

2SW-PWR80M96-XX 5 5.0108 6.0055 6.000 0.0025 5.0000 0.0033 5.7518 0.3740 5.4930 0.2500 10.4375 5.0148 6.0075 6.003 0.0075 4.9970 0.0153 5.7566 0.3780

bearIng Part nomInal Id od bore Press PIn runnIng grooVe grooVe sHoulder sHoulder maxImum number Id dIameter fIt dIameter clearance dIameter WIdtH dIameter WIdtH bearIng lengtH (+/-0.010) (+/-0.010) (+/-0.010) 2 seals (+/-0.010)

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER


PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID


SHOULDER WIDTH

PINDIAMETER

HOUSING

BEARING


BEARINGOD

BEARINGID

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER

HOUSINGBORE

GROOVEDIAMETER

SHOULDERDIAMETER


SHOULDER WIDTH

PolyLube® Glass Tape Thrust Bearings offer maintenance free operation under moderate loads. The recommended maximum design pressure is 7000 psi [483 MPa]. The thrust bearings require no grease or grease flushing, making them the perfect companion for PolyLube journal bearings. Please contact your PolyLube Sales Engineer or Applications Engineer to discuss your spe-cific application conditions and mating components. Other sizes available.



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THrusT BearingsVersatile high load, low friction composite bearings.


PWW04F08-3 1/4 0.2640 0.4800 0.0680 0.2540 0.5000 0.0880

PWW06F12-3 3/8 0.3890 0.7300 0.0680 0.3790 0.7500 0.0880

PWW08F16-3 1/2 0.5130 0.9800 0.0680 0.5030 1.0000 0.0880

PWW10F20-3 5/8 0.6380 1.2480 0.0680 0.6280 1.2500 0.0880

PWW12F24-3 3/4 0.7640 1.4800 0.0680 0.7540 1.5000 0.0880

PWW14F28-3 7/8 0.8880 1.7300 0.0680 0.8780 1.7500 0.0880

PWW16F32-3 1 1.0140 1.9800 0.0680 1.0040 2.0000 0.0880

PWW18F34-3 1-1/8 1.1500 2.1050 0.0680 1.1300 2.1250 0.0880 PWW20F36-3 1-1/4 1.2730 2.2300 0.0680 1.2530 2.2500 0.0880

PWW22F40-3 1-3/8 1.3990 2.4800 0.0680 1.3790 2.5000 0.0880

PWW24F42-3 1-1/2 1.5240 2.6050 0.0680 1.5040 2.6250 0.0880

PWW26F44-3 1-5/8 1.6490 2.7300 0.0680 1.6290 2.7500 0.0880

PWW28F46-3 1-3/4 1.7740 2.8550 0.0680 1.7540 2.8750 0.0880

PWW32F52-3 2 2.0240 3.2300 0.0680 2.0040 3.2500 0.0880

PWW36F54-3 2-1/4 2.2730 3.3550 0.0680 2.2530 3.3750 0.0880

PWW40F60-3 2-1/2 2.5240 3.7300 0.0680 2.5040 3.7500 0.0880

PWW44F66-3 2-3/4 2.7740 4.1050 0.0680 2.7540 4.1250 0.0880 PWW48F72-3 3 3.0240 4.4800 0.0680 3.0040 4.5000 0.0880

bearIng Part nomInal Id od tHIckness number Id

Polygon PWW Inch Series Thrust Bearings: Dimensions All measurements in inches.

The high strength fiberglass laminate allows for high compressive loading and excellent resistance to impact.



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©2016 Polygon Company, inc.

Documents

Bearings design guide - Polygon Composites · Bearings design guide. IntroductIon 3-10 Polygon’s company history and product manufacturing divisions. Product InformatIon 11-24 Polylube®