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DU/DUBDry Bearings
Designer´s Handbook
I
QualityAll the products described in this handbook are manufactured under DIN EN ISO 9001, ISO/TS 16949 and ISO 14001approved quality management systems.
Technical approvals:Tested and approved by MPA Stuttgart (for DU®B) for structural bearings for civil engineering applications.
II
Formula Symbols and Designations
FormulaSymbol Unit Designation
A mm2 Surface Area of DU bearing
AM mm2 Surface Area of mating surface in con-tact with DU bearing (slideway)
aB - Bearing size factor
aC - Application factor for bore burnishing or machining
aE - High load factor
aE1 - Specific load factor (slideways)
aE2 - Speed, temperature and material factor (slideways)
aE3 - Relative contact area factor (slideways)
aL - Life correction constant
aM - Mating surface material factor
aT - Temperature application factor
B mm Nominal bush width
C 1/min Dynamic load frequency
CD mm Installed diametral clearance
Ci mm ID chamfer length
Co mm OD chamfer length
CT - Total number of dynamic load cycles
DC mm Diameter of burnishing tool
Dfl mm Nominal bush flange OD
DH mm Housing Diameter
Di mm Nominal bush and thrust washer ID
Di,a mm Bush ID when assembled in housing
DJ mm Shaft diameter
DNth nvt Max. thermal neutron dose
Do mm Nominal bush and thrust washer OD
Dγ Gy Max. Gamma radiation dose
dch,1 mm Checking block diameter
dD mm Dowel hole diameter
dL mm Oil hole diameter
dP mm Pitch circle diameter for dowel hole
F N Bearing load
Fch N Test force
Fi N Insertion force
f - friction
Ha mm Depth of Housing Recess(e.g. for thrust washers)
Hd mm Diameter of Housing Recess(for thrust washers)
L mm Strip length
LH h Bearing service life
LS mm Length of stroke (slideway)
N 1/min Rotational speed
Nosz 1/min Oscillating movement frequency
p N/mm2 Specific load
plim N/mm2 Specific load limit
psta,max N/mm2 Maximum static load
pdyn,max N/mm2 Maximum dynamic load
Q - Permissible number of cycles
Ra mm Surface roughness (DIN 4768, ISO/DIN 4287/1)
ROB Ω Electrical resistance
s3 mm Bush wall thickness
sfl mm Flange thickness
sS mm Strip thickness
sT mm Thrust washer thickness
T °C Temperature
Tamb °C Ambient temperature
Tmax °C Maximum temperature
Tmin °C Minimum temperature
U m/s Sliding speed
W mm Strip width
WU min mm Minimum usable strip width
ZT - Total number of cycles
α1 1/106K Coefficient of linear thermal expansion parallel to surface
α2 1/106K Coefficient of linear thermal expansion normal to surface
σc N/mm2 Compressive Yield strength
λ W/mK Thermal conductivity
ϕ ° Angular displacement
η Ns/mm2 Dynamic Viscosity
FormulaSymbol Unit Designation
III
HistoricalThe development of a polytetrafluoroethylene (PTFE) lined composite dry bearing material was first begun by the Gla-cier Metal Company Ltd in 1948 and patents were subsequently granted for the material during the 1950's. Today DU® is the most successful of composite bearing materials, combining the excellent dry bearing properties ofPTFE with the mechanical properties of conventional metallic bearings, and has a wider range of performance andgreater number of applications than probably any other bearing material.
3
Content
Content
Quality . . . . . . . . . . . . . . . . . . . . . IFormula Symbols andDesignations . . . . . . . . . . . . . . . . IIHistorical . . . . . . . . . . . . . . . . . . III
1 Introduction . . . . . . . . . . . 51.1 Applications . . . . . . . . . . . . . . . . 51.2 Characteristics and
Advantages . . . . . . . . . . . . . . . . 51.3 Basic Forms Available . . . . . . . 51.4 Materials . . . . . . . . . . . . . . . . . . . 6
2 Material . . . . . . . . . . . . . . . 72.1 Structure . . . . . . . . . . . . . . . . . . . 72.2 Dry Wear Mechanism . . . . . . . . 72.3 Physical, Mechanical
and Electrical Properties . . . . . . 92.4 Chemical Properties . . . . . . . . 10
Electrochemical Corrosion . . . . . 102.5 Frictional Properties . . . . . . . . 10
3 Performance . . . . . . . . . 123.1 Design Factors . . . . . . . . . . . . . 12
Calculation . . . . . . . . . . . . . . . . . 123.2 Specific Load p . . . . . . . . . . . . 123.3 Specific Load Limit plim . . . . . . 133.4 Sliding Speed U . . . . . . . . . . . . 13
Continuous Rotation . . . . . . . . . 13Oscillating Movement . . . . . . . . 13
3.5 pU Factor . . . . . . . . . . . . . . . . . 143.6 Application Factors . . . . . . . . . 14
Temperature . . . . . . . . . . . . . . . 14Mating Surface . . . . . . . . . . . . . . 15Bearing Size . . . . . . . . . . . . . . . 15Bore Burnishing . . . . . . . . . . . . . 16Type of Load . . . . . . . . . . . . . . . 16
3.7 Calculation of Bearing Size . . 17Calculation for Bushes . . . . . . . . 17Calculation for Thrust Washers 17Calculation for Slideways . . . . . 17
3.8 Calculation of BearingService Life . . . . . . . . . . . . . . . . 18Specific load p . . . . . . . . . . . . . . 18High load factor aE . . . . . . . . . . 18Modified pU Factor . . . . . . . . . . 18Estimation of bearing life LH . . . . 19Bore Burnishing . . . . . . . . . . . . . 19Slideways . . . . . . . . . . . . . . . . . . 19
3.9 Worked Examples . . . . . . . . . . 20
4 Data Sheet . . . . . . . . . . . 224.1 Data for bearing design
calculations . . . . . . . . . . . . . . . 22
5 Lubrication . . . . . . . . . . . 235.1 Lubricants . . . . . . . . . . . . . . . . . 235.2 Tribology . . . . . . . . . . . . . . . . . . 23
Hydrodynamic lubrication . . . . . . 23Mixed film lubrication . . . . . . . . . 24Boundary lubrication . . . . . . . . . 24
5.3 Characteristics ofLubricated DU bearings . . . . . . 24
5.4 Design Guidance forLubricated Applications . . . . . 24
5.5 Clearances forlubricated operation . . . . . . . . . 26
5.6 Mating Surface Finish forlubricated operation . . . . . . . . . 26
5.7 Grooving forlubricated operation . . . . . . . . . 26
5.8 Grease Lubrication . . . . . . . . . 26
6 Bearing Assembly . . . . . 27Dimensions and Tolerances . . . . 27
6.1 Allowance forThermal Expansion . . . . . . . . . 27
6.2 Tolerances forminimum clearance . . . . . . . . . 27Sizing . . . . . . . . . . . . . . . . . . . . . 28
6.3 Counterface Design . . . . . . . . . 286.4 Installation . . . . . . . . . . . . . . . . 29
Fitting of cylindrical bushes . . . . 29Fitting of flanged bushes . . . . . . 29Insertion Forces . . . . . . . . . . . . . 29Alignment . . . . . . . . . . . . . . . . . . 30Sealing . . . . . . . . . . . . . . . . . . . . 30
6.5 Axial Location . . . . . . . . . . . . . . 30Fitting of Thrust Washers . . . . . . 30Slideways . . . . . . . . . . . . . . . . . . 31
7 Modification . . . . . . . . . . 327.1 Cutting and Machining . . . . . . 32
Drilling Oil Holes . . . . . . . . . . . . . 32Cutting Strip Material . . . . . . . . . 32
7.2 Electroplating . . . . . . . . . . . . . . 32DU Components . . . . . . . . . . . . . 32Mating Surfaces . . . . . . . . . . . . . 32
4
Content
8 Standard Products . . . . 338.1 DU Cylindrical Bushes . . . . . . 338.2 DU Flanged Bushes . . . . . . . . 388.3 DU Flanged Washers . . . . . . . 408.4 DU Thrust Washer . . . . . . . . . 418.5 DUB Cylindrical Bushes . . . . . 428.6 DUB Flanged Bushes . . . . . . . 448.7 DU Cylindrical Bushes -
Inch sizes . . . . . . . . . . . . . . . . . 458.8 DU Thrust Washers -
Inch sizes . . . . . . . . . . . . . . . . . 49
8.9 DU Strip . . . . . . . . . . . . . . . . . . 508.10 DUB Strip . . . . . . . . . . . . . . . . . 508.11 DU Strip - Inch sizes . . . . . . . . 50
9 Test Methods . . . . . . . . . 519.1 Measurement of
Wrapped Bushes . . . . . . . . . . . 51Test A of ISO 3547 Part 2 . . . . . 51Test B (alternatively to Test A) . 51Test C . . . . . . . . . . . . . . . . . . . . 51Measurement of Wall Thickness(alternatively to Test C) . . . . . . . 51Test D . . . . . . . . . . . . . . . . . . . . 51
5
1Introduction
1 IntroductionThe purpose of this handbook is to providecomprehensive technical information onthe characteristics of DUTM bearings. The information given permits designers toestablish the correct size of bearing requi-red and the expected life and performance. GGB Research and Development servicesare available to assist with unusual designproblems.Complete information on the range of DUstandard stock products is given togetherwith details of other DU products.
GGB is continually refining and extendingits experimental and theoretical knowledgeand, therefore, when using this brochure itis always worth-while to contact the Com-pany should additional information berequired. As it is impossible to cover all conditions ofoperation which arise in practice, custo-mers are advised to carry out prototypetesting wherever possible.
1.1 ApplicationsDU is suitable for • rotating, • oscillating, • reciprocating and • sliding movements.Also available are DU related materialcompositions for specific applications, for
example when increased corrosion resi-stance of the bearing material is requireddue to• atmospheric or environmental consider-
ations• food safety regulations
1.2 Characteristics and Advantages• DU requires no lubrication• Provides maintenance free operation• DU has a high pU capability• DU exhibits low wear rate• Seizure resistant• Suitable for temperatures from
-200 to +280 °C• High static and dynamic load capacity• Good frictional properties with negli-
gible stick-slip
• Resists solvents• No water absorption and therefore
dimensionally stable• DU is electrically conductive and
shows no electrostatic effects• DU has good embedability and is tol-
erant of dusty environments• Compact and light• DU bearings are prefinished and
require no machining after assembly
1.3 Basic Forms AvailableStandard Components available from stock. These products are manufactured to Inter-national, National or GGB standarddesigns.
Metric and Imperial sizes• Cylindrical Bushes• Flanged Bushes *• Thrust Washers
• Flanged Washers *• Strip Material* Metric sizes only
6
1 Introduction
Fig. 1: Standard Components
Non-Standard Components not available from stock. These products are manufactured tocustomers' requirements with or withoutGGB recommendations, and include forexample• Modified Standard Components
• Half Bearings• Flat Components• Deep Drawn Parts• Pressings• Stampings
Fig. 2: Non-Standard Components
1.4 Materials
Table 1: Characteristics of DU and DUB
Material Backing Bearing Lining
Operating Temperature [°C] Maximum Load plim
[N/mm2]Minimum Maximum
DU Steel PTFE+Lead -200 +280 250
DUB Bronze PTFE+Lead -200 +280 140
7
2Material
2 Material2.1 Structure
DUDU and DUB take advantage of the out-standing dry bearing properties of Polyte-trafluoroethylene (PTFE) and combinesthem with strength, stability and good wearresistance, excellent heat conductivity andlow thermal expansion.DU consists of three bonded layers: a steelbacking strip and a porous bronze matrix,impregnated and overlaid with the PTFE/lead bearing material.
Fig. 3: DU Microsection
DUBDUB also consists of three layers, with abronze backing replacing the steel backingstrip. The structure is otherwise the sameas that of DU. The bronze backing provides a high corro-sion resistance, anti magnetic propertiesand a good thermal conductivity.
Fig. 4: DUB Microsection
2.2 Dry Wear Mechanism
Fig. 5: Effect of wear on the DU bearing surface under dry operating conditions.
Rad
ial w
ear [
mm
]
Life LH [h]
0.01
0.02
0.04
0 2000 3000 4000
0.03
0
1000 5000
0.05
6000 7000
Bronze beginning to smear near end of material lifeFig. 8
Typical appearance after half material life Fig. 7
Running-in completed low wear rate starts when bronze is exposed Fig. 6
8
2 Material
Running-inDuring normal operation, a DU bearingquickly beds in and the PTFE/lead overlaymaterial removed during this period, typi-cally 0.015 mm, is transferred to themating surface and forms a physically bon-ded lubricant film. The rubbing surface of the bearing oftenacquires a grey-green colour and thebronze matrix can be seen exposed overabout 10 % of the bearing surface. Any
excess of the PTFE/lead surface layer willbe shed as fine feathery particles.
Fig. 6: Running-in
After 50 % of useful lifeFollowing the running-in period the wearrate reduces to a minimum and the per-centage of bronze exposed graduallyincreases.
Fig. 7: After 50 % of useful life
End of useful lifeAfter an extended period of operation thewear rate increases as the componentapproaches the end of its useful life as aself-lubricating bearing. At this stage atleast 70 % of the bearing surface will beexposed bronze, and approximately0.06 mm wear will have occurred.
Fig. 8: End of useful life
Wear of Mating SurfacesThere is no measurable wear of matingsurfaces made from recommended materi-als unless a DU bearing is operated
beyond its useful life or becomes contami-nated with abrasive dirt.
9
2Material
2.3 Physical, Mechanical and Electrical Properties
Table 2: Properties of DU and DUB
Characteristic SymbolValue
Unit CommentsDU DUB
Physical Properties
Thermal Conductivity λ 40 60 W/mK after running in.
Coefficient of linear thermal expansion : measured on strip 1.9 mm thick.
parallel to surface α1 11 18 1/106K
normal to surface α2 30 36 1/106K
Maximum Operating Temperature
Tmax +280 +280 °C
Minimum Operating Temperature
Tmin –200 –200 °C
Mechanical Properties Compressive Yield Strength σc 350 300 N/mm²
measured on disc 25 mm diameter x 2.44 mm thick.
Maximum Load
Static psta,max 250 140 N/mm²
Dynamic pdyn,max 140 140 N/mm²
Electrical Properties Surface Resistance ROB 1 – 10 1 – 12 Ω depends on applied pressure
and contact area
Nuclear Radiation Resistance
Maximum Thermal Neutron dose
DNth 2 x 1015 2 x 1015 nvt nvt = thermal neutron flux
Maximum gamma ray dose Dγ 106 106 Gy = J/kg 1 Gray = 1 J/kg
10
2 Material
2.4 Chemical PropertiesThe following table provides an indicationof the chemical resistance of DU and DUBto various chemical media. It is recommen-
ded that the chemical resistance is confir-med by testing if possible.
Table 3: Chemical Resistance of DU and DUB
Electrochemical CorrosionDUB should not be used in conjunctionwith aluminium housings due to the risk of
electrochemical corrosion in the presenceof water or moisture.
2.5 Frictional PropertiesDU bearings show negligible 'stick-slip'and provide smooth sliding between adja-cent surfaces. The coefficient of friction ofDU depends upon:• The specific load p [N/mm²]
• The sliding speed U [m/s]
• The roughness of the mating runningsurface Ra [µm]
• The bearing temperature T [° C].A typical relationship is shown in Fig. 9,which can be used as a guide to establishthe actual friction under clean, dry conditi-ons after running in. Exact values may vary by ±20 % depen-ding on operating conditions.
Chemical % ° C DU DUB
Strong Acids Hydrochloric Acid 5 20 - -Nitric Acid 5 20 - -Sulphuric Acid 5 20 - -
Weak Acids Acetic Acid 5 20 - oFormic Acid 5 20 - o
Bases Ammonia 10 20 o -Sodium Hydroxide 5 20 o o
Solvents Acetone 20 + +Carbon Tetrachloride 20 + +
Lubricants and Fuels
Paraffin 20 + +Gasolene 20 + +Kerosene 20 + +Diesel Fuel 20 + +Mineral Oil 70 o oHFA-ISO46 High Water Fluid 70 o oHFC-Water-Glycol 70 - -HFD-Phosphate Ester 70 o oWater 20 o +Sea Water 20 - o
+ Satisfactory: Corrosion damage is unlikely to occur.
oAcceptable: Some corrosion damage may occur but this will not be sufficient to impair either the structural integrity or the tribological performance of the material.
-Unsatisfactory: Corrosion damage will occur and is likely to affect either the structural integrity and/or the tribo-logical performance of the material.
11
2Material
Before running in, the friction may be up to50 % higher.With frequent starts and stops, the staticcoefficient of friction is approximately equalto, or even slightly less than the dynamiccoefficient of friction.After progressively longer periods of dwellunder load (e.g. hours or days) the static
coefficient of friction on the first movementmay be between 1.5 and 3 times greater,particularly before running in.Friction increases at bearing temperaturesbelow 0 ° C. Where frictional characteristics are criticalto a design they should be established byprototype testing.
Fig. 9: Variation of friction coefficient f with specific load p and sliding speed U at tem-perature T = 25 ° C
Fig. 10: Variation of friction coefficient f with specific load p and temperature T at sliding speed U = 0.01 m/s
0.30
0.25
0.20
0.15
0.10
0.05
00.1
1.0
10
100 0.00001
0.0001
0.001
0.01
0.1
1.0
1.5
2.0
2.5
0.25-0.30
0.20-0.25
0.15-0.20
0.10-0.15
0.05-0.10
0.00-0.05
Example
Specific loadp = 2.5 N/mm²Sliding speedU = 0.003 m/sFriction coefficientf = 0.14
Sliding speed U [m/s]
Specific load p [N/mm²]
Friction coefficient f
0.25
0.20
0.15
0.10
0.05
00.1
1.0
10
100 0
25
50
75
100
125
150
200
250
Example
Specific loadp = 2.5 N/mm²TemperatureT= 40 °CFriction coefficientf = 0.125
Specific load p [N/mm²]
Friction coefficient f
Temperatur T [°C]
0.25-0.30
0.20-0.25
0.15-0.20
0.10-0.15
0.05-0.10
0.00-0.05
12
3 Performance
3 Performance3.1 Design FactorsThe main parameters when determiningthe size or calculating the service life for aDU bearing are:• Specific Load Limit plim• pU Factor
• Mating surface roughness Ra• Mating surface material • Temperature T • Other environmental factors e.g. hous-
ing design, dirt, lubrication
CalculationTwo design procedures are provided asfollows:• A bearing service life calculation based
on the permitted bearing dimensions
• A calculation of the necessary bearingdimensions based on the required bear-ing service life
3.2 Specific Load p For the purpose of assessing bearing per-formance the specific load p is defined asthe working load divided by the projected
area of the bearing and is expressed inN/mm2.
Cylindrical Bush
Thrust Washer
Flanged Bush (Axial Loading)
Slideway
Permanent deformation of the DU bearinglining may occur at specific loads above140 N/mm2 and under these conditions DUshould only be used with slow intermittentmovements.
The permissible maximum load on a thrustwasher is higher than that on the flange ofa flanged bush, and under conditions ofhigh axial loads a thrust washer should bespecified.
p FDi B⋅----------------=
(3.2.1) [N/mm2]
[N/mm2]
p 4F
π Do2 Di
2–( )⋅
-----------------------------------=
(3.2.2)
p F
0 04, Dfl2 Di
2–( )⋅
-----------------------------------------------=
(3.2.3) [N/mm2]
p FL W⋅----------------=
(3.2.4) [N/mm2]
13
3Performance
3.3 Specific Load Limit plim The maximum load which can be appliedto a DU bearing can be expressed in termsof the Specific Load Limit, which dependson the type of the loading. It is highestunder steady loads. Conditions of dynamicload or oscillating movement which pro-duce fatigue stress in the bearing result ina reduction in the permissible SpecificLoad Limit.In general the specific load on a DU bea-ring should not exceed the Specific LoadLimits given in Table 4.The values of Specific Load Limit specifiedin Table 4 assume good alignment bet-ween the bearing and mating surface(Fig. 29).
Fig. 11: Projected Area
Maximum specific load plim
Table 4: Maximum specific load plim
3.4 Sliding Speed USpeeds in excess of 2.5 m/s sometimeslead to overheating, and a running in pro-cedure may be beneficial.
This could consist of a series of short runsprogressively increasing in duration froman initial run of a few seconds.
Calculation of Sliding Speed U [m/s]
Continuous RotationCylindrical Bush Thrust Washer
Oscillating MovementCylindrical Bush Thrust Washer
BD
i
Projected Area
A = Di x B
Type of loading plim [N/mm2]
steady load, rotating movement 140
steady load, oscillating movement
plim 140 140 115 95 85 80 60 44 30 20
No. of movement cycles Q 1000 2000 4000 6000 8000 104 105 106 107 108
dynamic load, rotating or oscillating movement
plim 60 60 50 46 42 40 30 22 15 10
No. of load cycles Q 1000 2000 4000 6000 8000 104 105 106 107 108
UDi π N⋅ ⋅
60 103⋅---------------------------=
(3.4.1) [m/s]
U
Do Di+
2------------------- π N⋅ ⋅
60 103⋅-----------------------------------------=
(3.4.2) [m/s]
UDi π⋅
60 103⋅-----------------------
4ϕ Nosz⋅360
---------------------------⋅=
(3.4.3) [m/s]
U
Do Di+
2------------------- π⋅
60 103⋅-----------------------------
4ϕ Nosz⋅360
---------------------------⋅=
(3.4.4) [m/s]
14
3 Performance
3.5 pU FactorThe useful operating life of a DU bearing isgoverned by the pU factor, the product ofthe specific load p [N/mm2] and the slidingspeed U [m/s].For thrust washers and flanged bush thrustfaces the rubbing velocity at the mean dia-meter is used.pU factors up to 3.6 N/mm2 x m/s can beaccommodated for short periods, whilst forcontinuous rating.
pU factors up to 1.8 N/mm2 x m/s can beused, depending upon the operating liferequired.
Table 5: Typical data p, u and pU
Calculation of pU Factor [N/mm² x m/s]
3.6 Application FactorsThe following factors influence the bearingperformance of DU and must be concide-red in calculating the required dimension
or estimating the bearing life for a particu-lar application.
Temperature The useful life of a DU bearing dependsupon the operating temperature.Under dry running conditions frictional heatis generated at the rubbing surface of thebearing dependent on the pU condition.For a given pU factor the operating tempe-rature of the bearing depends upon thetemperature of the surrounding environ-
ment and the heat dissipation properties ofthe housing. Intermittent operation affectsthe heat dissipation from the assembly andhence the operating temperature of thebearing.The effect of temperature on the operatinglife of DU bearings is indicated by the fac-tor aT shown in Table 6.
Table 6: Temperature application factor aT
DU Unit
p 140 N/mm²
U 2.5 m/s
pU continuous 1.8 N/mm² x m/s
pU intermittent 3.6 N/mm² x m/s
pU p U⋅=
(3.5.1) [N/mm2 x m/s]
Mode of Operation Nature of housingTemperature of bearing environment Tamb [° C]
and Temperature application factor aT
25 60 100 150 200 280
Dry continuous operation Average heat dissipating qualities 1.0 0.8 0.6 0.4 0.2 0.1
Dry continuous operation Light pressings or isolated housing with poor heat dissipating qualities 0.5 0.4 0.3 0.2 0.1 -
Dry continuous operation Non-metallic housings with bad heat dissi-pating qualities 0.3 0.3 0.2 0.1 - -
Dry intermittent operation (duration less than 2 min, followed by a longer dwell period)
Average heat dissipating qualities 2.0 1.6 1.2 0.8 0.4 0.2
Continuously immersed in water 2.0 1.5 0.6 - - -
Alternately immersed in water & dry 0.2 0.1 - - - -
Continuously immersed in non lubricant liquids other than water 1.5 1.2 0.9 0.6 0.3 0.1
Continuously immersed in lubricant 3.0 2.5 2.0 1.5 - -
15
3Performance
Mating SurfaceThe effect of the mating surface materialtype on the operating life of DU bearings isindicated by the mating surface factor aMand the life correction constant aL shown inTable 7.
Table 7: Mating surface factor aM and life correction constant aL
Note:The factor values given assume a matingsurface finish of ≤0.4 µm Ra
• A ground surface is preferred to fineturned
• Surfaces should be cleaned of abrasiveparticles after polishing
• Cast iron surfaces should be ground to<0.3 µm Ra
• The grinding cut should be in the samedirection as the bearing motion relativeto the shaft
Bearing SizeThe running clearance of a DU bearingincreases with bearing diameter resultingin a proportionally smaller contact areabetween the shaft and bearing. This reduc-tion in contact area has the effect of increa-sing the actual unit load and hence pU
factor. The bearing size factor (Fig. 13) isused in the design calculations to allow forthis effect. The bearing size factor is alsoapplicable to thrust washers, where forother reasons, bearing diameter has aneffect on performance.
Fig. 12: Contact area between bearing and shaft.
Material aM aL
Steel and Cast Iron
Carbon Steel 1 200
Carbon Manganese Steel 1 200
Alloy Steel 1 200
Case Hardened Steel 1 200
Nitrided Steel 1 200
Salt bath nitrocarburised 1 200
Stainless Steel(7-10 % Ni, 17-20 % Cr) 2 200
Sprayed Stainless Steel 1 200
Cast Iron(0.3 µm Ra) 1 200
Plated Steel with minimum thickness of pla-ting 0.013 mm
Cadmium 0.2 600
Hard Chrome 2.0 600
Lead 1.5 600
Nickel 0.2 600
Phosphated 0.2 300
Tin Nickel 1.2 600
Titanium Nitride 1.0 600
Tungsten Carbide Flame Plated 3.0 600
Zinc 0.2 600
Non ferrous metals
Aluminium Alloys 0.4 200
Bronze and Copper Base Alloys
0.1-0.4 200
Hard Anodised Aluminium (0.025 mm thick) 3.0 600
Material aM aL
16
3 Performance
Fig. 13: Bearing size factor aB
Bore BurnishingBurnishing or machining the bore of a DUbearing results in a reduction in the wearperformance. The application factor aC
given in Table 8 is used in the design cal-culations to allow for this effect.
Table 8: Bore burnishing or machining application factor aC
Type of Load
Fig. 14: Steady load, Bush Stationary, Shaft rotating
Fig. 15: Rotating load, shaft stationary, bush rotating
Bea
ring
size
fact
or a
B
Shaft diameter DJ [mm]
0.2
0.3
1.0
1
0.5
0.1
0.4
5
0.60.7
0.90.8
2.0
6 7 8 9 10 50 100 500
1.5
Degree of sizingApplication factor
aC
Burnishing:Excess of burnishing tool diameter over mean bore size
0.025 mm 0.8
0.038 mm 0.6
0.050 mm 0.3
Boring: Depth of cut
0.025 mm 0.6
0.038 mm 0.3
0.050 mm 0.1
F2---
F2---
F F2---
F2---
F
17
3Performance
3.7 Calculation of Bearing Size In designing all bearings, the shaft diame-ter is usually determined by considerationsof physical stability or stiffness and themain variable to be determined is thelength of the bush or the land width of thethrust washer.The formulae given below enable desi-gners to calculate the length or width
necessary to satisfy both the Specific LoadLimit and the pU/Life relationship.If it is found that the total length exceedstwice the diameter of the shaft, this indica-tes that the conditions envisaged are toosevere for DU material and considerationshould be given to repositioning the bea-rings in order to reduce the load.
Calculation for BushesBush Stationary, Shaft Rotating
Bush Rotating, Shaft Stationary
Calculation for Thrust Washers
Calculation for Slideways
Fig. 16: Slideway
BF N LH aL+( )⋅ ⋅
1 25 107 aT aM aB⋅⋅ ⋅ ⋅,-------------------------------------------------------------------------- F
plim Di⋅-----------------------+=
(3.7.1) [mm]
BF N LH aL+( )⋅ ⋅
2 5 107 aT aM aB⋅⋅ ⋅ ⋅,----------------------------------------------------------------------- F
plim Di⋅-----------------------+=
(3.7.2) [mm]
Do Di–F N LH aL+( )⋅ ⋅
1 25, 107 aT aM aB⋅⋅ ⋅ ⋅-------------------------------------------------------------------------- Di
2 1 3F,plim
---------------++= Di–
(3.7.3) [mm]
A2 38 F U LH aL+( )⋅ ⋅,
103 aT aM⋅ ⋅--------------------------------------------------------------
L LS+( )L
--------------------- Fplim----------+⋅=
(3.7.4) [mm2]
L
LS
W
DU/DUB Strip
Mating Surface
18
3 Performance
3.8 Calculation of Bearing Service LifeWhere the size of a bearing is governedlargely by the space available the followingcalculation can be used to determine whe-
ther its useful life will satisfy the require-ments. If the calculated life is inadequate,a larger bearing should be considered.
Specific load pBushes
Flanged Bushes
Thrust Washers
High load factor aE
If aE is negative then the bearing is over-loaded. Increase the bearing diameterand/or length.
Modified pU Factor Bushes
Flanged Bushes
Thrust Washers
For oscillating movement, calculate theaverage rotational speed.
Fig. 17: Oscillating cycle ϕ
p FDi B⋅----------------=
(3.8.1) [N/mm2]
p F
0 04, Dfl2 Di
2–( )⋅
-----------------------------------------------=
(3.8.2) [N/mm2]
p 4F
p Do2 Di
2–( )⋅
-----------------------------------=
(3.8.3) [N/mm2]
aEplim p–
plim-----------------=
(3.8.4) [–]
plim see Table 4, Page 13
pU 5 25 10 5–⋅, F N⋅aE B aT aM aB⋅⋅ ⋅ ⋅------------------------------------------------------------=
(3.8.5) [N/mm2 x m/s]
pU 6 5 10 4–⋅, F N⋅aE Dfl Di–( ) aT aM aB⋅⋅ ⋅ ⋅--------------------------------------------------------------------------------=
(3.8.6) [N/mm2 x m/s]
pU 3 34 10 5–⋅, F N⋅aE Do Di–( ) aT aM aB⋅⋅ ⋅ ⋅--------------------------------------------------------------------------------=
(3.8.7) [N/mm2 x m/s]
N4ϕ Nosz⋅
360---------------------------=
(3.8.8) [1/min]ϕ ϕ
123 4
19
3Performance
Estimation of bearing life LH Bushes (Steady load)
Bushes (Rotating load)
Flanged Bushes (Axial load)
Thrust Washers
Bore BurnishingIf the DU bush is bore burnished then thismust be allowed for in estimating the bea-
ring life by the application factor aC(Table 8, Page 16).
Estimated Bearing Life
SlidewaysSpecific load factor
If negative the bearing is overloaded andthe bearing area should be increased.
Speed temperature and materialapplication factors
Relative contact area factor
Estimated bearing life
Estimated bearing lives greater than4000 h are subject to error due to inaccu-racies in the extrapolation of test data.
For Oscillating Movements or Dynamicload: Calculate estimated number of cyclesZT.
ZT = LH x Nosz x 60 (for Oscillating Move-ments) (3.8.18).ZT = LH x C x 60 (for dynamic load)(3.8.19).Check that ZT is less than total number ofcycles Q for the operating specific load p(Table 4, Page 13).
If ZT <Q, LH will be limited by wear after ZTcycles.If ZT >Q, LH will be limited by fatigue afterZT cycles.
LH615pU---------- aL–=
(3.8.9) [h]
LH1230pU
------------- aL–=
(3.8.10) [h]
LH410pU---------- aL–=
(3.8.11) [h]
LH410pU---------- aL–=
(3.8.12) [h]
LH LH aC⋅=
(3.8.13) [h]
aE1 A Fplim----------–=
(3.8.14) [–]
aE2420 aT aM⋅ ⋅
F U⋅--------------------------------------=
(3.8.15) [–]
aE3A
AM--------=
(3.8.16) [–]
LH aE1 aE2 aE3 aL–⋅ ⋅=
(3.8.17) [h]
20
3 Performance
3.9 Worked ExamplesCylindrical BushGiven:Load Details Steady Load Inside Diameter Di 40 mm
Continuous Rotation Length B 30 mmShaft Steel Bearing Load F 5000 N
Unlubricated at 25 °C Rotational Speed N 50 1/min
Calculation Constants and Application FactorsSpecific Load Limit plim 140 N/mm² (Table 4, Page 13)Temperature Application Factor aT 1.0 (Table 6, Page 14)Material Application Factor aM 1.0 (Table 7, Page 15)Bearing Size Factor aB 0.85 (Fig. 13, Page 16)Life Correction Constant aL 200 (Table 7, Page 15)
Calculation Ref ValueSpecific Load p [N/mm²]
(3.2.1), Page 12
Sliding Speed U [m/s]
(3.4.1), Page 13
pU Factor (Calculate from Table 5, Page 14)
(3.5.1), Page 14
High Load FactoraE [-] (must be >0)
(3.8.4), Page 18
Modified pU Factor [N/mm² x m/s]
(3.8.5), Page 18
LifeLH [h]
(3.8.9), Page 19
p FDi B⋅---------------- 5000
40 30⋅-------------------- 4 17,= = =
U Di π N⋅ ⋅
60 103⋅--------------------------- 40 3 14, 50⋅ ⋅
60 103⋅------------------------------------------ 0 105,= = =
U p U⋅ 4 17 0 105 0 438,=,⋅,= =
aEplim p–
plim---------------- 140 4 17,–
140---------------------------- 0 97,= = =
pU 5 25 10 5–⋅, F N⋅aE B aT aM aB⋅⋅ ⋅ ⋅---------------------------------------------------------- 0 53,= =
LH615pU---------- aL– 615
0 53,--------------= 200 960=–=
Cylindrical BushGiven:Load Details Dynamic Load Inside Diameter Di 30 mm
Continuous Rotation Length B 30 mmShaft Steel Bearing Load F 25000 N
Unlubricated at 25 °C Rotational Speed N 15 1/minLoad frequency
Calculation Constants and Application FactorsSpecific Load Limit plim 60 N/mm² (Table 4, Page 13)Temperature Application Factor aT 1.0 (Table 6, Page 14)Material Application Factor aM 1.0 (Table 7, Page 15)Bearing Size Factor aB 1 (Fig. 13, Page 16)Life Correction Constant aL 200 (Table 7, Page 15)
Calculation Ref ValueSpecific Load p [N/mm²]
(3.2.1), Page 12
Sliding Speed U [m/s]
(3.4.1), Page 13
pU Factor (Calculate from Table 5, Page 14)
(3.5.1), Page 14
High Load FactoraE [-] (must be >0)
(3.8.4), Page 18
Modified pU Factor [N/mm² x m/s]
(3.8.5), Page 18
LifeLH [h]
(3.8.9), Page 19
Calculate total load cycles
Table 4, Page 13
Q for 27.78 N/mm² = bearing will fatigue after 105 cy-cles (= 28 h)
p FDi B⋅---------------- 25000
30 30⋅-------------------- 27 78,= = =
U Di π N⋅ ⋅
60 103⋅--------------------------- 30 3 14, 15⋅ ⋅
60 103⋅------------------------------------------ 0 024,= = =
U p U⋅ 27 87 0 024 0 669,=,⋅,= =
aEplim p–
plim---------------- 60 27 87,–
60---------------------------- 0 54,= = =
pU 5 25 10 5–⋅, F N⋅aE B aT aM aB⋅⋅ ⋅ ⋅---------------------------------------------------------- 1 23,= =
LH615pU---------- aL– 615
1 23,--------------= 200 350=–=
ZT 300 60 60⋅ ⋅ 300 106⋅= =
Cylindrical BushGiven:Load Details Steady Load
Load RotatingInside Diameter Di 50 mm
Continuous Rotation Length B 50 mmShaft Steel Bearing Load F 10000 N
Unlubricated at 100 °C Rotational Speed N 50 1/min
Calculation Constants and Application FactorsSpecific Load Limit plim 60 N/mm² (Table 4, Page 13)Temperature Application Factor aT 0.6 (Table 6, Page 14)Material Application Factor aM 1.0 (Table 7, Page 15)Bearing Size Factor aB 0.78 (Fig. 13, Page 16)Life Correction Constant aL 200 (Table 7, Page 15)
Calculation Ref ValueSpecific Load p [N/mm²]
(3.2.1), Page 12
Sliding Speed U [m/s]
(3.4.1), Page 13
pU Factor (Calculate from Table 5, Page 14)
(3.5.1), Page 14
High Load FactoraE [-] (must be >0)
(3.8.4), Page 18
Modified pU Factor [N/mm² x m/s]
(3.8.5), Page 18
LifeLH [h]
(3.8.9), Page 19
p FDi B⋅---------------- 10000
50 50⋅-------------------- 4 0,= = =
U Di π N⋅ ⋅
60 103⋅--------------------------- 50 3 14, 50⋅ ⋅
60 103⋅------------------------------------------ 0 131,= = =
pU p U⋅ 4 0 0 131 0 524,=,⋅,= =
aEplim p–
plim---------------- 60 4 0,–
60--------------------- 0 93,= = =
pU 5 25 10 5–⋅, F N⋅aE B aT aM aB⋅⋅ ⋅ ⋅---------------------------------------------------------- 1 20,= =
LH1230pU
------------- aL– 12301 2,-------------= 200 825=–=
Cylindrical BushGiven:Load Details Steady Load Inside Diameter Di 45 mm
Oscillating Movements Length B 40 mmShaft Stainless Steel Bearing Load F 40000 N
Unlubricated at 25 °C Frequency C 150Continuous operation Amplitudes ϕ 20 °
Calculation Constants and Application FactorsSpecific Load Limit plim 140 N/mm² (Table 4, Page 13)Temperature Application Factor aT 1.0 (Table 6, Page 14)Material Application Factor aM 2.0 (Table 7, Page 15)Bearing Size Factor aB 0.81 (Fig. 13, Page 16)Life Correction Constant aL 200 (Table 7, Page 15)
Calculation Ref ValueSpecific Load p [N/mm²]
(3.2.1), Page 12
Sliding Speed U [m/s]
(3.4.1), Page 13
Average speedN [1/min]
(3.8.8), Page 18
pU Factor (Calculate from Table 5, Page 14)
(3.5.1), Page 14
High Load FactoraE [-] (must be >0)
(3.8.4), Page 18
Modified pU Factor[N/mm² x m/s]
(3.8.5), Page 18
LifeLH [h]
(3.8.9), Page 19
Calculate total load cycles
Table 4, Page 13
Q for 22.22 N/mm² = 108 bearing o.k.!
p FDi B⋅---------------- 40000
45 40⋅-------------------- 22 22,= = =
U 45 3 14, 33 33,⋅ ⋅60 103⋅
------------------------------------------------------ 0 078,= =
N 4ϕ Nosz⋅360
------------------------- 4 20 150⋅ ⋅360
---------------------------------- 33 33,= = =
pU p U⋅ 22 22 0 078 1 733,=,⋅,= =
aEplim p–
plim---------------- 140 22 22,–
140------------------------------- 0 84,= = =
pU 5 25 10 5–⋅, F N⋅aE B aT aM aB⋅⋅ ⋅ ⋅---------------------------------------------------------- 1 29,= =
LH615pU---------- aL– 615
1 29,--------------= 200 277=–=
ZT 277 150 60⋅ ⋅ 2 5, 106⋅= =
21
3Performance
Thrust WasherGiven:Load Details Axial Load, Outside Diameter Do 62 mm
Continuous Rotation Inside Diameter Di 38 mmShaft Steel Bearing Load F 6500 N
Unlubricated at 25 °C Rotational Speed N 60 1/min
Calculation Constants and Application FactorsSpecific Load Limit plim 140 N/mm² (Table 4, Page 13)Temperature Application Factor aT 1.0 (Table 6, Page 14)Material Application Factor aM 1.0 (Table 7, Page 15)Bearing Size Factor aB 0.85 (Fig. 13, Page 16)Life Correction Constant aL 200 (Table 7, Page 15)
Calculation Ref ValueSpecific Loadp [N/mm²]
(3.8.3), Page 18
Sliding Speed U [m/s]
(3.4.2), Page 13
pU Factor (Calculate from Table 5, Page 14)
(3.5.1), Page 14
High Load Factor aE [-]
(3.8.4), Page 18
Modified pU Factor [N/mm² x m/s]
(3.8.7), Page 18
Life LH [h]
(3.8.12), Page 19
p 4 6500⋅3 14, 622 382–( )⋅------------------------------------------------ 3 45,= =
U
62 38+( )2
------------------------ 3 14, 60⋅ ⋅
60 1000⋅------------------------------------------------------------ 0 157,= =
U p U⋅ 3 45 0 157 0 541,=,⋅,= =
aE140 3 45,–
140---------------------------- 0 98,= =
pU 3 34, 10 5–⋅ 6500 60⋅0 87, 62 38–( ) 1 1 0 85,⋅⋅ ⋅ ⋅----------------------------------------------------------------------------------------- 0 65,= =
LH410
0 65,-------------- 200 431=–=
Flanged BushGiven:Load Details Axial Load Flange outside Diameter
Dfl
23 mm
Continuous Rotation Inside Diameter Di 15 mmShaft Steel Bearing Load F 250 N
Unlubricated at 25 °C Rotational Speed N 25 1/min
Calculation Constants and Application FactorsSpecific Load Limit plim 140 N/mm² (Table 4, Page 13)Temperature Application Factor aT 1.0 (Table 6, Page 14)Material Application Factor aM 1.0 (Table 7, Page 15)Bearing Size Factor aB 1.0 (Fig. 13, Page 16)Life Correction Constant aL 200 (Table 7, Page 15)
Calculation Ref ValueSpecific Load p [N/mm²]
(3.2.2), Page 12
Sliding Speed U [m/s]
(3.4.2), Page 13
pU Factor (Calculate from Table 5, Page 14)
(3.5.1), Page 14
High Load Factor aE [-]
(3.8.4), Page 18
Modified pU Factor [N/mm² x m/s]
(3.8.6), Page 18
Life LH [h]
(3.8.11), Page 19
p 2500 04, 232 152–( )⋅------------------------------------------------ 20 55,= =
U
23 15+( )2
------------------------ 3 14, 25⋅ ⋅
60 1000⋅------------------------------------------------------------ 0 025,= =
pU p U⋅ 20 55 0 025 0 513,=,⋅,= =
aE140 20 55,–
140------------------------------- 0 85,= =
pU 6 5, 10 5– 250⋅ 50⋅0 85, 23 15–( ) 1 1 1⋅⋅ ⋅ ⋅------------------------------------------------------------------------------ 0 59,= =
LH410
0 59,-------------- 200 495=–=
22
4 Data Sheet
4 Data Sheet4.1 Data for bearing design calculations
Quantity
Dimensions in mm
Inside Diameter Di
Length BOutside Diameter Do
Flange Diameter Dfl
Flange Thickness sfl
Length of slideplate LWidth of slideplate WThickness of slideplate sS
Radial load F [N]or specific load p [N/mm2]
Axial load F [N]or specific load p [N/mm2]
Oscillating frequency Nosz [1/min]
Rotational speed N [1/min]Speed U [m/s]Length of Stroke LS [mm]Frequency of Stroke [1/min]Oscillating cycle ϕ [° ]
Continuous operation
Load
Service hours per day
Days per yearOperating timeIntermittent operation
Movement
Shaft DJBearing Housing DH
Fits and Tolerances
Ambient temperature Tamb [°]
Operating Environment
Non metal housing with poor heat transfer properties
Light pressing or insulated housing which poor heat transfer properties
Housing with good heat transferproperties
Material
Mating surface
Surface finish Ra [µm]Hardness HB/HRC
Process FluidLubricant
Alternate operation in water and dry
Dry
Lubrication
Process fluid lubrication
Continuous lubrication
Initial lubrication only
Hydrodynamic conditions
Dynamic viscosity η
Required service life LH [h]
Service life
Rotational movement Steady load Rotating load Oscillating movement
Cylindrical Bush Flanged Bush Thrust Washer Slideplate
Existing Design New Design
Special(Sketch)
Linear movement
B
Di (
Di,a
)
Do
Di (D
i,a)
Dfl
DiDo Do
Ws S
Bsfl sT
L
Customer DataCompany: City:Street: Post Code:
Project:Name:Tel.:
Date:Signature:Fax:
Application:
23
5Lubrication
5 LubricationAlthough DU was developed as a dry selflubricating bearing material, DU also provi-des excellent performance in lubricatedapplications.
The following sections describe the basicsof lubrication and provide guidance on theapplication of DU in such environments.
5.1 LubricantsDU can be used with most fluids including• water• lubricating oils• engine oil• turbine oil• hydraulic fluid• solvent• refrigerantsIn general, the fluid will be acceptable if itdoes not chemically attack the PTFE/leadoverlay or the porous bronze interlayer.Where there is doubt about the suitabilityof a fluid, a simple test is to submerge a
sample of DU material in the fluid for two tothree weeks at 15-20 °C above the opera-ting temperature. The following will usually indicate that thefluid is not suitable for use with DU:• A significant change in the thickness of
the DU material,• A visible change in the bearing surface
other than some discolouration or stain-ing
• A visible change in the microstructure ofthe bronze interlayer
5.2 TribologyThere are three modes of lubricated bea-ring operation which relate to the thicknessof the developed lubricant film between thebearing and the mating surface.These three modes of operation dependupon:
• Bearing dimensions• Clearance• Load• Speed• Lubricant Viscosity• Lubricant Flow
Hydrodynamic lubricationCharacterised by:• Complete separation of the shaft from
the bearing by the lubricant film• Very low friction and no wear of the bear-
ing or shaft since there is no contact.• Coefficients of friction of 0.001 to 0.01Hydrodynamic conditions occur when Fig. 18: Hydrodynamic lubrication
p U η⋅7 5,------------- B
Di-----⋅≤
(5.2.1) [N/mm2]
24
5 Lubrication
Mixed film lubricationCharacterised by:• Combination of hydrodynamic and
boundary lubrication. • Part of the load is carried by localised
areas of self pressurised lubricant andthe remainder supported by boundarylubrication.
• Friction and wear depend upon thedegree of hydrodynamic support devel-oped.
• DU provides low friction and high wearresistance to support the boundary lubri-cated element of the load.
Fig. 19: Mixed film lubrication
Boundary lubrication Characterised by:• Rubbing of the shaft against the bearing
with virtually no lubricant separating thetwo surfaces.
• Bearing material selection is critical toperformance
• Shaft wear is likely due to contactbetween bearing and shaft.
• The excellent self lubricating propertiesof DU material minimises wear underthese conditions.
• The coefficient of friction with DU is typi-cally 0.02 to 0.06 under boundary lubri-cation conditions.
Fig. 20: Boundary lubrication
5.3 Characteristics of Lubricated DU bearingsDU is particularly effective in the mostdemanding of lubricated applications
where full hydrodynamic operation cannotbe maintained, for example:
• High load conditionsIn highly loaded applications operatingunder boundary or mixed film conditionsDU shows excellent wear resistance andlow friction.
• Start up and shut down under load With insufficient speed to generate ahydrodynamic film the bearing will oper-ate under boundary or mixed film condi-tions. DU minimises wear and requiresless start up torque than conventionalmetallic bearings.
• Sparse lubrication Many applications require the bearing tooperate with less than the ideal lubricantsupply, typically with splash or mist lubri-cation only. DU provides excellent selflubricating properties.
• Dry operation after running in waterIf a DU bearing is required to run dryafter running in water under non hydro-dynamic conditions then the wear resist-ance will be substantially reduced due toan increased amount of bedding in wear.
5.4 Design Guidance for Lubricated ApplicationsFig. 21 shows the three lubrication regimesdiscussed above. In order to use Fig. 21,using the formula on page 12 and page 13:• Calculate the specific load p,• Calculate the shaft surface speed U.
Using the viscosity temperature relati-onships presented in Table 9.• Determine the lubricant viscosity in
centipoise, of the lubricant.If the operating temperature of the fluid isunknown, a provisional temperature of25 ° C above ambient can be used.
25
5Lubrication
Area 1The bearing will operate with boundarylubrication and pU factor will be the majordeterminant of bearing life. The DU bea-ring performance can be calculated using
the method given in Section 3, althoughthe result will probably underestimate thebearing life
Area 2The bearing will operate with mixed filmlubrication and the pU factor is no longer asignificant parameter in determining the
bearing life. The DU bearing performancewill depend upon the nature of the fluid andthe actual service conditions.
Area 3The bearing will operate with hydrodyna-mic lubrication. The bearing wear will bedetermined only by the cleanliness of the
lubricant and the frequency of start up andshut down.
Area 4These are the most demanding operatingconditions. The bearing is operated undereither high speed or high bearing load toviscosity ratio, or a combination of both. These conditions may cause:
• excessive operating temperature and/or • high wear rate.The bearing performance may be impro-ved by adding one or more grooves to thebearing and a shaft surface finish<0,05 µm Ra.
Fig. 21: Design guide for lubricated application
Table 9: Viscosity data
Spe
cific
bea
ring
load
p [N
/mm
²]
Journal surface speed U [m/s]
0.1
1.0
10
0.01 0.1 1.0 10
Increased clearances may be necessary
Detail bearing design may be necessary - consult the company
Area 1Effectively dry rubbing
Area 2Mixed film lubrication
Area 3Full hydrodynamic lubrication
Area 4
Vis
cosi
ty η
[cP]
Conditions:
- Steady unidirectional loading- Continuous, non reversing shaft rotation- Sufficient clearance between shaft and bearing- Sufficient lubricant flow
Viscosity cP
Temperature [°C] 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
Lubricant
ISO VG 32 310 146 77 44 27 18 13 9.3 7.0 5.5 4.4 3.6 3.0 2.5 2.2
ISO VG 46 570 247 121 67 40 25 17 12 9.0 6.9 5.4 4.4 3.6 3.0 2.6
ISO VG 68 940 395 190 102 59 37 24 17 12 9.3 7.2 5.8 4.7 3.9 3.3
ISO VG 100 2110 780 335 164 89 52 33 22 15 11.3 8.6 6.7 5.3 4.3 3.6
ISO VG 150 3600 1290 540 255 134 77 48 31 21 15 11 8.8 7.0 5.6 4.6
Diesel oil 4.6 4.0 3.4 3.0 2.6 2.3 2.0 1.7 1.4 1.1 0.95
Petrol 0.6 0.56 0.52 0.48 0.44 0.40 0.36 0.33 0.31
Kerosene 2.0 1.7 1.5 1.3 1.1 0.95 0.85 0.75 0.65 0.60 0.55
Water 1.79 1.30 1.0 0.84 0.69 0.55 0.48 0.41 0.34 0.32 0.28
26
5 Lubrication
5.5 Clearances for lubricated operationThe recommended shaft and housing dia-meters given for standard DU bushes willprovide sufficient clearance for applicati-ons operating with boundary lubrication.For bearings operating with mixed film orhydrodynamic lubrication it may be neces-
sary to improve the fluid flow through thebearing by reducing the recommendedshaft diameter by approximately 0.1 %,particularly when the shaft surface speedexceeds 2.5 m/s.
5.6 Mating Surface Finish for lubricated operation• Ra ≤0.4 µm Boundary lubrication• Ra = 0.1-0.2 µm Mixed film or hydrody-
namic conditions
• Ra ≤0.05 µm for the most demandingoperating conditions
5.7 Grooving for lubricated operationIn demanding applications an axial oilgroove will improve the performance ofDU. Fig. 22 shows the recommended formand location of a single groove with
respect to the applied load and the bearingsplit. GGB can manufacture special DUbearings with embossed or milled grooveson request.
Fig. 22: Location of oil holes and grooves
5.8 Grease LubricationDU is not generally recommended for usewith grease lubrication. In particular the fol-lowing must be avoided:• Dynamic loads - which can result in ero-
sion of the PTFE/lead bearing surface.
• Greases with EP additives or fillers suchas graphite or MoS2 which can causerapid wear of DU.
gap
20° -60°0° -
0.25-0.40
10-15 % of inside diameter of bearing0° -
Groove Detail Z
Z
Φ
27
6Bearing Assembly
6 Bearing AssemblyDimensions and TolerancesDU bushes are prefinished in the bore, andexcept in very exceptional circumstances,must not be burnished, broached or other-wise modified. It is essential that the cor-rect running clearance is used and thatboth the diameter of the shaft and the boreof the housing are finished to the limitsgiven in the tables. Under dry running con-ditions any increase in the clearancesgiven will result in a proportional reductionin performance.If the bearing housing is unusually flexiblethe bush will not close in by the calculated
amount and the running clearance will bemore than the optimum. In these circum-stances the housing should be boredslightly undersize or the journal diameterincreased, the correct size being determi-ned by experiment.Where free running is essential, or wherelight loads (less than 0.1 N/mm²) prevailand the available torque is low, increasedclearance is required and it is recommen-ded that the shaft size quoted in the tablebe reduced by 0.025 mm.
6.1 Allowance for Thermal ExpansionFor operation in high temperature environ-ments the clearance should be increasedby the amounts indicated by Fig. 23 to
compensate for the inward thermal expan-sion of the bearing lining.
Fig. 23: Increase in diametral clearanceIf the housing is non-ferrous then the boreshould be reduced by the amounts given inTable 10, in order to give an increased
interference fit to the bush, with a similarreduction in the journal diameter additionalto that indicated by Fig. 23.
Table 10: Allowance for high temperature
6.2 Tolerances for minimum clearanceWhere it is required to keep the variation ofassembled clearance to a minimum, closertolerances can be specified towards theupper end of the journal tolerance and thelower end of the housing tolerance.
If housings to H6 tolerance are used, thenthe journals should be finished to the follo-wing limits.The sizes in Table 11 give the followingnominal clearance range.
Table 11: Shaft tolarances for use with H6 housings
Table 12: Clearance vs bearing diameter
Incr
ease
in m
inim
um
diam
etra
l cle
aran
ce [m
m]
Environmental temperature Tamb [°C]
0.01
0.02
0 40 60 800
20 100 120 140
Housing material Reduction in housing diameter per 100 °C rise
Reduction in shaft diameter per100 °C rise
Aluminium alloys 0.1 % 0.1 % + values from Fig. 23
Copper base alloys 0.05 % 0.05 % + values from Fig. 23
Steel and cast iron – values from Fig. 23
Zinc base alloys 0.15 % 0.15 % + values from Fig. 23
Di DJ
<25 mm -0.019 to -0.029
>25 mm < 50 mm -0.021 to -0.035
Di CD
10 mm 0.005 to 0.078
50 mm 0.005 to 0.130
28
6 Bearing Assembly
Sizing
Fig. 24: Burnishing toolThe burnishing or fine boring of the bore ofan assembled DU bush in order to achievea smaller clearance tolerance is only per-missible if a substantial reduction in perfor-mance is acceptable. Fig. 24 shows arecommended burnishing tool for thesizing of DU bushes.
The coining section of the burnishing toolshould be case hardened (case depth 0.6-1.2 mm, HRC 60±2) and polished (RZ ≈1µm).Note: Ball burnishing of DU bushes is notrecommended.
Table 13: Burnishing tool tolerances
The values given in Table 13 indicate thedimensions of the burnishing tool requiredto give specific increases in the bearingbore diameter.Exact values must be determined by test.The reduction in bearing performance as aresult of burnishing is allowed for in thebearing life calculation by the applicationfactor aC (Table 8, Page 16).
6.3 Counterface DesignThe suitability of mating surface materialsand recommendations of mating surfacefinish for use with DU are discussed indetail on page 15.DU is normally used in conjunction withferrous journals and thrust faces, but indamp or corrosive surroundings, particu-larly without the protection of oil or grease,stainless steel, hard chromium plated mildsteel, or hard anodised aluminium isrecommended. When plated mating sur-faces are specified the plating should pos-sess adequate strength and adhesion,particularly if the bearing is to operate withhigh fluctuating loads.The shaft or thrust collar used in con-junction with the DU bush or thrust washermust extend beyond the bearing surface inorder to avoid cutting into it. The matingsurface must also be free from grooves orflats, the end of the shaft should be given alead-in chamfer and all sharp edges orprojections which may damage the softoverlay of the DU must be removed. Fig. 25: Counterface Design
0.5°
6±2
Di
B +1
0B
DC
R 1.5
Assembled bush
Inside-∅
Required bush
Inside-∅
Required burnishing
tool diameter DC
Di,a Di,a + 0.025 Di,a + 0.06
Di,a Di,a + 0.038 Di,a + 0.08
Di,a Di,a + 0.050 Di,a + 0.1
incorrect correct
29
6Bearing Assembly
6.4 Installation
Fitting of cylindrical bushes
Fig. 26: Fitting of cylindrical bushes
Fitting of flanged bushes
Fig. 27: Fitting of flanged bushes
Insertion Forces
Fig. 28: Maximum Insertion Force
Do <55 mm Do >55 mm Do >120 mm
15° -30°
Mounting Ring
Note:Lightly oil back of bush to assist assembly.
for D
H ≤1
25 =
0.8
for D
H >
125
= 2
for D
H ≤1
25 =
0.8
for D
H >
125
= 2
DiDi
DH
DH
cham
fer m
in =
r m
ax x
45°
Z
Z
0.5
x 15
°
r max see pages 38/44
Max
imum
inse
rtion
forc
e [N
/mm
uni
t len
gth]
Bush bore diameter Di [mm]
200
400
1000
0 30 40 50
800
0
20 100
600
10
30
6 Bearing Assembly
AlignmentAccurate alignment is an important consi-deration for all bearing assemblies, but isparticularly so for dry bearings becausethere is no lubricant to spread the load.
With DU bearings misalignment over thelength of a bush (or pair of bushes), or overthe diameter of a thrust washer should notexceed 0.020 mm as illustrated in Fig. 29.
Fig. 29: Alignment
SealingWhile DU can tolerate the ingress of somecontaminant materials into the bearing wit-hout loss of performance, where there isthe possibility of highly abrasive material
entering the bearing, a suitable sealingarrangement, as illustrated in Fig. 30should be provided.
Fig. 30: Recommended sealing arrangements
6.5 Axial LocationWhere axial location is necessary, it isadvisable to fit DU thrust washers in con-
junction with DU bushes, even when theaxial loads are low.
Fitting of Thrust WashersDU thrust washers should be located in arecess as shown in Fig. 31. The recessdiameter should be 0.125 mm larger thenthe washer diameter and the depth asgiven in the product tables.
If a recess is not possible one of the follo-wing methods may be used:• Two dowel pins• Two screws• Adhesive• Soldering
31
6Bearing Assembly
Important Note• Ensure the washer ID does not touch the
shaft after assembly• Ensure that the washer is mounted with
the steel backing to the housing• Dowels pins should be recessed
0.25 mm below the bearing surface• Screws should be countersunk 0.25 mm
below the bearing surface• DU must not be heated above 320 ° C• Contact adhesive manufacturers for
guidance selection of suitable adhesives• Protect the bearing surface to prevent
contact with adhesive
Fig. 31: Installation of Thrust-Washer
Grooves for Wear Debris RemovalTests with thrust washers have demonstra-ted that for optimum dry wear performanceat specific loads in excess of 35 N/mm2,four wear debris removal grooves should
be machined in the bearing surface asshown in Fig. 32. Grooves in bushes have not been found tobe beneficial in this respect.
Fig. 32: Debris removal Grooves
SlidewaysDU strip material for use as slideway bea-rings should be installed using one of thefollowing methods:
• Countersunk screws• Adhesives• Mechanical location as shown in Fig. 33
Fig. 33: Mechanical location of DU slideplates
0.1 x Di 0.4 deep
32
7 Modification
7 Modification7.1 Cutting and MachiningThe modification of DU bearing compon-ents requires no special procedures. Ingeneral it is more satisfactory to performmachining or drilling operations from thePTFE side in order to avoid burrs. Whencutting is done from the steel side, the
minimum cutting pressure should be usedand care taken to ensure that any steel orbronze particles protruding into the remai-ning bearing material, and all burrs, areremoved.
Drilling Oil HolesBushes should be adequately supportedduring the drilling operation to ensure that
no distortion is caused by the drilling pres-sure.
Cutting Strip MaterialDU strip material may be cut to size by anyone of the following methods. Care must be taken to protect the bearingsurface from damage and to ensure thatno deformation of the strip occurs:• Using side and face cutter, or slitting
saw, with the strip held flat and securely
on a horizontal milling machine.• Cropping• Guillotine
(For widths less than 90 mm only)• Water-jet cutting• Laser cutting (see Health Warning)
7.2 Electroplating
DU ComponentsIn order to provide some protection inmildly corrosive environments the steelback and end faces of standard range DUbearings are tin flashed. If exposed to corrosive liquids further pro-tection should be provided and in very cor-rosive conditions DUB should beconsidered.DU can be electroplated with most of theconventional electroplating metals inclu-ding the following:• zinc ISO 2081-2• cadmium ISO 2081-2• nickel ISO 1456-8• hard chromium ISO 1456-8
For the harder materials if the specifiedplating thickness exceeds approximately 5µm then the housing diameter should beincreased by twice the plating thickness inorder to maintain the correct assembledbearing bore size.With light deposits of materials such ascadmium, no special precautions arenecessary. Harder materials such as nickelhowever, may strike through the PTFE/lead surface layer of DU and it is advisableto use an appropriate method of maskingthe bearing surface.Where electrolytic attack is possible testsshould be conducted to ensure that all thematerials in the bearing environment aremutually compatible.
Mating SurfacesDU can be used against some platedmaterials as indicated on page 15.
Care should be taken to ensure that therecommended shaft sizes and surfacefinish are achieved after the plating pro-cess.
33
8Standard Products
8 Standard Products8.1 DU Cylindrical Bushes
All dimensions in mm
0.3
min
.
s 3D
i(D
i,a)
Do
Co
Ci
B
Z
20° ±8°
Detail Z
Split
Dimensions and Tolerances according to ISO 3547 and GSP-Specifications
Part No.Nominal Diameter Wall thichness
s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
ClearanceCD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
0203DU2 3.5
0.7500.730
3.252.75
h6
2.0001.994
H6
3.5083.500
2.0482.000
0.0540.000
0205DU 5.254.75
0303DU
3 4.5
3.252.75
3.0002.994
4.5084.500
3.0483.0000305DU 5.25
4.75
0306DU 6.255.75
0403DU
4 5.5
3.252.75
4.0003.992
5.5085.500
4.0484.000
0.0560.000
0404DU 4.253.75
0406DU 6.255.75
0410DU 10.259.75
0505DU
5 7
1.0050.980
5.254.75
f7
4.9904.978
H7
7.0157.000
5.0554.990
0.0770.000
0508DU 8.257.75
0510DU 10.259.75
0604DU
6 8
4.253.75
5.9905.978
8.0158.000
6.0555.990
0606DU 6.255.75
0608DU 8.257.75
0610DU 10.259.75
0705DU7 9
5.254.75 6.987
6.9729.0159.000
7.0556.990
0.0830.0030710DU 10.25
9.75
Outside Co and Inside Ci chamfers
a = Chamfer Co machined or rolled at the opinion of the manufacturer
b = Ci can be a radius or a chamfer in accordance with ISO 13715
Wall thickness s3
Co (a)Ci (b)
machined rolled0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4
1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.51.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7
Wall thickness s3
Co (a)Ci (b)
machined rolled2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7
2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0
34
8 Standard Products
0806DU
8 10
1.0050.980
6.255.75
f7
7.9877.972
H7
10.01510.000
8.0557.990
0.0830.003
0808DU 8.257.75
0810DU 10.259.75
0812DU 12.2511.75
1006DU
10 12
6.255.75
9.9879.972
12.01812.000
10.0589.990
0.0860.003
1008DU 8.257.75
1010DU 10.259.75
1012DU 12.2511.75
1015DU 15.2514.75
1020DU 20.2519.75
1208DU
12 14
8.257.75
11.98411.966
14.01814.000
12.05811.990
0.0920.006
1210DU 10.259.75
1212DU 12.2511.75
1215DU 15.2514.75
1220DU 20.2519.75
1225DU 25.2524.75
1310DU13 15
10.259.75 12.984
12.96615.01815.000
13.05812.9901320DU 20.25
19.75
1405DU
14 16
5.254.75
13.98413.966
16.01816.000
14.05813.990
1410DU 10.259.75
1412DU 12.2511.75
1415DU 15.2514.75
1420DU 20.2519.75
1425DU 25.2524.75
1510DU
15 17
10.259.75
14.98414.966
17.01817.000
15.05814.990
1512DU 12.2511.75
1515DU 15.2514.75
1520DU 20.2519.75
1525DU 25.2524.75
1610DU
16 18
10.259.75
15.98415.966
18.01818.000
16.05815.990
1612DU 12.2511.75
1615DU 15.2514.75
1620DU 20.2519.75
1625DU 25.2524.75
1720DU 17 19 20.2519.75
16.98416.966
19.02119.000
17.06116.990
0.0950.006
Part No.Nominal Diameter Wall thichness
s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
ClearanceCD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
35
8Standard Products
1810DU
18 20 1.0050.980
10.259.75
f7
17.98417.966
H7
20.02120.000
18.06117.990
0.0950.006
1815DU 15.2514.75
1820DU 20.2519.75
1825DU 25.2524.75
2010DU
20 23
1.5051.475
10.259.75
19.98019.959
23.02123.000
20.07119.990
0.1120.010
2015DU 15.2514.75
2020DU 20.2519.75
2025DU 25.2524.75
2030DU 30.2529.75
2215DU
22 25
15.2514.75
21.98021.959
25.02125.000
22.07121.990
2220DU 20.2519.75
2225DU 25.2524.75
2230DU 30.2529.75
2415DU
24 27
15.2514.75
23.98023.959
27.02127.000
24.07123.990
2420DU 20.2519.75
2425DU 25.2524.75
2430DU 30.2529.75
2515DU
25 28
15.2514.75
24.98024.959
28.02128.000
25.07124.990
2520DU 20.2519.75
2525DU 25.2524.75
2530DU 30.2529.75
2550DU 50.2549.75
2815DU
28 32
2.0051.970
15.2514.75
27.98027.959
32.02532.000
28.08527.990
0.1260.010
2820DU 20.2519.75
2825DU 25.2524.75
2830DU 30.2529.75
3010DU
30 34
10.259.75
29.98029.959
34.02534.000
30.08529.990
3015DU 15.2514.75
3020DU 20.2519.75
3025DU 25.2524.75
3030DU 30.2529.75
3040DU 40.2539.75
3220DU
32 36
20.2519.75
31.97531.950
36.02536.000
32.08531.990
0.1350.0153230DU 30.25
29.75
3240DU 40.2539.75
Part No.Nominal Diameter Wall thichness
s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
ClearanceCD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
36
8 Standard Products
3520DU
35 39
2.0051.970
20.2519.75
f7
34.97534.950
H7
39.02539.000
35.08534.990
0.1350.015
3530DU 30.2529.75
3535DU 35.2534.75
3540DU 40.2539.75
3550DU 50.2549.75
3720DU 37 41 20.2519.75
36.97536.950
41.02541.000
37.08536.990
4020DU
40 44
20.2519.75
39.97539.950
44.02544.000
40.08539.990
4030DU 30.2529.75
4040DU 40.2539.75
4050DU 50.2549.75
4520DU
45 50
2.5052.460
20.2519.75
44.97544.950
50.02550.000
45.10544.990
0.1550.015
4530DU 30.2529.75
4540DU 40.2539.75
4545DU 45.2544.75
4550DU 50.2549.75
5020DU
50 55
20.2519.75
49.97549.950
55.03055.000
50.11049.990
0.1600.015
5030DU 30.2529.75
5040DU 40.2539.75
5050DU 50.2549.75
5060DU 60.2559.75
5520DU
55 60
20.2519.75
54.97054.940
60.03060.000
55.11054.990
0.1700.020
5525DU 25.2524.75
5530DU 30.2529.75
5540DU 40.2539.75
5550DU 50.2549.75
5555DU 55.2554.75
5560DU 60.2559.75
6020DU
60 65 2.5052.460
20.2519.75
59.97059.940
65.03065.000
60.11059.990
0.1700.020
6030DU 30.2529.75
6040DU 40.2539.75
6050DU 50.2549.75
6060DU 60.2559.75
6070DU 70.2569.75
Part No.Nominal Diameter Wall thichness
s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
ClearanceCD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
37
8Standard Products
6530DU
65 70
2.5052.460
30.2529.75
f7
64.97064.940
H7
70.03070.000
65.11064.990
0.1700.020
6550DU 50.2549.75
6570DU 70.2569.75
7040DU
70 75
40.2539.75
69.97069.940
75.03075.000
70.11069.9907050DU 50.25
49.75
7070DU 70.2569.75
7560DU75 80
60.2559.75 74.970
74.94080.03080.000
75.11074.9907580DU 80.25
79.75
8040DU
80 85
2.4902.440
40.5039.50
h8
80.00079.946
85.03585.000
80.15580.020
0.2090.020
8060DU 60.5059.50
8080DU 80.5079.50
80100DU 100.5099.50
8530DU
85 90
30.5029.50
85.00084.946
90.03590.000
85.15585.0208560DU 60.50
59.50
85100DU 100.5099.50
9060DU90 95
60.5059.50 90.000
89.94695.03595.000
90.15590.02090100DU 100.50
99.50
9560DU95 100
60.5059.50 95.000
94.946100.035100.000
95.15595.02095100DU 100.50
99.50
10050DU
100 105
50.5049.50
100.00099.946
105.035105.000
100.155100.02010060DU 60.50
59.50
100115DU 115.50114.50
10560DU105 110
60.5059.50 105.000
104.946110.035110.000
105.155105.020105115DU 115.50
114.50
11060DU110 115
60.5059.50 110.000
109.946115.035115.000
110.155110.020110115DU 115.50
114.50
11550DU115 120
50.5049.50 115.000
114.946120.035120.000
115.155115.02011570DU 70.50
69.50
12050DU
120 125
2.4652.415
50.5049.50
120.000119.946
125.040125.000
120.210120.070
0.2640.07012060DU 60.50
59.50
120100DU 100.5099.50
125100DU 125 130 100.5099.50
125.000124.937
130.040130.000
125.210125.070
0.2730.07013060DU
130 135
60.5059.50 130.000
129.937135.040135.000
130.210130.070130100DU 100.50
99.50
Part No.Nominal Diameter Wall thichness
s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
ClearanceCD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
38
8 Standard Products
8.2 DU Flanged Bushes
All dimensions in mm
13560DU135 140
2.4652.415
60.5059.50
h8
135.000134.937
H7
140.040140.000
135.210135.070
0.2730.070
13580DU 80.5079.50
14060DU140 145
60.5059.50 140.000
139.937145.040145.000
140.210140.070140100DU 100.50
99.50
15060DU
150 155
60.5059.50
150.000149.937
155.040155.000
150.210150.07015080DU 80.50
79.50
150100DU 100.5099.50
16080DU160 165
80.5079.50 160.000
159.937165.040165.000
160.210160.070160100DU 100.50
99.50
180100DU 180 185
100.5099.50
180.000179.937
185.046185.000
180.216180.070
0.2790.070
200100DU 200 205 200.000199.928
205.046205.000
200.216200.070
0.2880.070210100DU 210 215 210.000
209.928215.046215.000
210.216210.070
220100DU 220 225 220.000219.928
225.046225.000
220.216220.070
250100DU 250 255 250.000249.928
255.052255.000
250.222250.070
0.2940.070
300100DU 300 305 300.000299.919
305.052305.000
300.222300.070
0.3030.070
Part No.Nominal Diameter Wall thichness
s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
ClearanceCD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
D
i(D
i,a)
Do
rmax
0.3
min
.
Dfl
Co
Ci
B
20° ±8°
Z
sfl
Do - Di
2
s 3
Detail Z
Split
Dimensions and Tolerances according to ISO 3547 and GSP-Specifications
Part No.
Nominal Diameter
Wall thickness
s3
Flange thickness
sfl
Flange-∅ Dfl
WidthB
Shaft-∅DJ [h6, f7]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
Clearance CD
Di Domaxmin.
max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
max. min.
BB0304DU 3 4.5 0.7500.730
0.800.70
7.506.50 4.25
3.75 h6
3.0002.994 H6
4.5084.500
3.0483.000
0.0540.000
BB0404DU 4 5.5 9.508.50
4.0003.992
5.5084.500
4.0484.000
0.0560.000
BB0505DU 5 7 1.0050.980
1.050.80
10.509.50
5.254.75 f7 4.990
4.978 H7 7.0157.000
5.0554.990
0.0770.000
Outside Co and Inside Ci chamfers
a = Chamfer Co machined or rolled at the opinion of the manufacturer
b = Ci can be a radius or a chamfer in accordance with ISO 13715
Wall thickness s3
Co (a)Ci (b)
machined rolled0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4
1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.51.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7
Wall thickness s3
Co (a)Ci (b)
machined rolled2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7
2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0
39
8Standard Products
BB0604DU6 8
1.0050.980
1.050.80
12.5011.50
4.253.75
f7
5.9905.978
H7
8.0158.000
6.0555.990
0.0770.000BB0608DU 8.25
7.75
BB0806DU
8 10 15.5014.50
5.755.25
7.9877.972
10.01510.000
8.0557.990
0.0830.003BB0808DU 7.75
7.25
BB0810DU 9.759.25
BB1007DU
10 12 18.5017.50
7.256.75
9.9879.972
12.01812.000
10.0589.990
0.0860.003
BB1009DU 9.258.75
BB1012DU 12.2511.75
BB1017DU 17.2516.75
BB1207DU
12 14 20.5019.50
7.256.75
11.98411.966
14.01814.000
12.05811.990
0.0920.006
BB1209DU 9.258.75
BB1212DU 12.2511.75
BB1217DU 17.2516.75
BB1412DU14 16 22.50
21.50
12.2511.75 13.984
13.96616.01816.000
14.05813.990BB1417DU 17.25
16.75
BB1509DU
15 17 23.5022.50
9.258.75
14.98414.966
17.01817.000
15.05814.990BB1512DU 12.25
11.75
BB1517DU 17.2516.75
BB1612DU16 18 24.50
23.50
12.2511.75 15.984
15.96618.01818.000
16.05815.990BB1617DU 17.25
16.75
BB1812DU
18 20 26.5025.50
12.2511.75
17.98417.966
20.02120.000
18.06117.990
0.0950.006BB1817DU 17.25
16.75
BB1822DU 22.2521.75
BB2012DU
20 23
1.5051.475
1.601.30
30.5029.50
11.7511.25
19.98019.959
23.02123.000
20.07119.990
0.1120.010
BB2017DU 16.7516.25
BB2022DU 21.7521.25
BB2512DU
25 28 35.5034.50
11.7511.25
24.98024.959
28.02128.000
25.07124.990BB2517DU 16.75
16.25
BB2522DU 21.7521.25
BB3016DU30 34
2.0051.970
2.101.80
42.5041.50
16.2515.75 29.980
29.95934.02534.000
30.08529.990
0.1260.010BB3026DU 26.25
25.75
BB3516DU35 39 47.50
46.50
16.2515.75 34.975
34.95039.02539.000
35.08534.990
0.1350.015
BB3526DU 26.2525.75
BB4016DU40 44 53.50
52.50
16.2515.75 39.975
39.95044.02544.000
40.08539.990BB4026DU 26.25
25.75
BB4516DU45 50 2.505
2.4602.602.30
58.5057.50
16.2515.75 44.975
44.95050.02550.000
45.10544.990
0.1550.015BB4526DU 26.25
25.75
Part No.
Nominal Diameter
Wall thickness
s3
Flange thickness
sfl
Flange-∅ Dfl
WidthB
Shaft-∅DJ [h6, f7]
Housing−∅DH [H6, H7]
Bush-∅ Di,aAss. in H6/H7
housing
Clearance CD
Di Domaxmin.
max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
max. min.
40
8 Standard Products
8.3 DU Flanged Washers
All dimensions in mm
Corrosion Protection: Washers will be supplied covered with a light coating of oil.Tab (Lug) Form: Washers are supplied with this feature in an unformed state (Flat). This feature may be supplied in the formedstate only when requested by the customer.
r 1.25
Do
d p
4.8 -0.6
Di
Dfl
1.5 x 45°
r 1
8±1
5 ±0.1
30°
1.98±0.02
Part No.
Inside-∅Di
Outside-∅Do
Flange-∅Dfl
Location-∅dP
max.min.
max.min.
max.min.
max.min.
BS40DU 40.740.2
75.074.5
44.00043.900
65.064.5
BS50DU 51.551.0
85.084.5
55.00054.880
75.074.5
BS60DU 61.561.0
95.094.5
65.00064.880
85.084.5
BS70DU 71.571.0
110.0109.5
75.00074.880
100.099.5
BS80DU 81.581.0
120.0119.5
85.00084.860
110.0109.5
BS90DU 91.591.0
130.0129.5
95.00094.860
120.0119.5
BS100DU 101.5101.0
140.0139.5
105.000104.860
130.0129.5
41
8Standard Products
8.4 DU Thrust Washer
All dimensions in mm
dP
Di
Do
sT
Ha
Do
d p
dD
Hd
[D10
]
DJ
Part No.
Inside-∅Di
Outside-∅Do
Thickness sTDowel Hole Recess Depth
Ha∅ dD PCD-∅ dP
min. max. max. min. max.min.
max.min.
max.min.
max.min.
WC08DU 10.00 10.25 20.00 19.75
1.501.45
No Hole No Hole
1.200.95
WC10DU 12.00 12.25 24.00 23.75 1.8751.625
18.1217.88
WC12DU 14.00 14.25 26.00 25.75
2.3752.125
20.1219.88
WC14DU 16.00 16.25 30.00 29.75 22.1221.88
WC16DU 18.00 18.25 32.00 31.75 25.1224.88
WC18DU 20.00 20.25 36.00 35.75
3.3753.125
28.1227.88
WC20DU 22.00 22.25 38.00 37.75 30.1229.88
WC22DU 24.00 24.25 42.00 41.75 33.1232.88
WC24DU 26.00 26.25 44.00 43.75 35.1234.88
WC25DU 28.00 28.25 48.00 47.75
4.3754.125
38.1237.88
WC30DU 32.00 32.25 54.00 53.75 43.1242.88
WC35DU 38.00 38.25 62.00 61.75 50.1249.88
WC40DU 42.00 42.25 66.00 65.75 54.1253.88
WC45DU 48.00 48.25 74.00 73.75
2.001.95
61.1260.88
1.701.45WC50DU 52.00 52.25 78.00 77.75 65.12
64.88
WC60DU 62.00 62.25 90.00 89.75 76.1275.88
42
8 Standard Products
8.5 DUB Cylindrical Bushes
All dimensions in mm
0.3
min
.
s 3D
i(D
i,a)
Do
Co
Ci
B
Z
20° ±8°
Detail Z
Split
Dimensions and Tolerances according to ISO 3547 and GSP-Specifications
Part No.
Nominal Diameter
Wall thickness s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aass. in H6/H7
housing
Clearance CD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
0203DUB2 3.5
0.7500.730
3.252.75
h6
2.0001.994
H6
3.5083.500
2.0482.000 0.054
0.0000205DUB 5.254.75
0306DUB 3 4.5 6.255.75
3.0002.994
4.5084.500
3.0483.000
0404DUB4 5.5
4.253.75 4.000
3.9925.5085.500
4.0484.000
0.0560.0000406DUB 6.25
5.75
0505DUB5 7
1.0050.980
5.254.75
f7
4.9904.978
H7
7.0157.000
5.0554.990
0.0770.000
0510DUB 10.259.75
0606DUB
6 8
6.255.75
5.9905.978
8.0158.000
6.0555.9900608DUB 8.25
7.75
0610DUB 10.259.75
0808DUB
8 10
8.257.75
7.9877.972
10.01510.000
8.0557.990
0.0830.0030810DUB 10.25
9.75
0812DUB 12.2511.75
1010DUB10 12
10.259.75 9.987
9.97212.01812.000
10.0589.990
0.0860.0031015DUB 15.25
14.75
1208DUB
12 14
8.257.75
11.98411.966
14.01814.000
12.05811.990
0.0920.006
1210DUB 10.259.75
1212DUB 12.2511.75
1215DUB 15.2514.75
Outside Co and Inside Ci chamfers
a = Chamfer Co machined or rolled at the opinion of the manufacturer
b = Ci can be a radius or a chamfer in accordance with ISO 13715
Wall thickness s3
Co (a)Ci (b)
machined rolled0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4
1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.51.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7
Wall thickness s3
Co (a)Ci (b)
machined rolled2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7
2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0
43
8Standard Products
1410DUB
14 16
1.0050.980
10.259.75
f7
13.98413.966
H7
16.01816.000
14.05813.990
0.0920.006
1415DUB 15.2514.75
1420DUB 20.2519.75
1515DUB15 17
15.2514.75 14.984
14.96617.01817.000
15.05814.9901525DUB 25.25
24.75
1615DUB16 18
15.2514.75 15.984
15.96618.01818.000
16.05815.9901625DUB 25.25
24.75
1820DUB18 20
20.2519.75 17.984
17.96620.02120.000
18.06117.990
0.0950.0061825DUB 25.25
24.75
2015DUB
20 23
1.5051.475
15.2514.75
19.98019.959
23.02123.000
20.07119.990
0.1120.0102020DUB 20.25
19.75
2030DUB 30.2529.75
2215DUB
22 25
15.2514.75
21.98021.959
25.02125.000
22.07121.990
0.1120.010
2220DUB 20.2519.75
2225DUB 25.2524.75
2515DUB25 28
15.2514.75 24.980
24.95928.02128.000
25.07124.9902525DUB 25.25
24.75
2830DUB 28 32
2.0051.970
30.2529.75
27.98027.959
32.02532.000
28.08527.990
0.1260.010
3020DUB
30 34
20.2519.75
29.98029.959
34.02534.000
30.08529.9903030DUB 30.25
29.75
3040DUB 40.2539.75
3520DUB35 39
20.2519.75 34.975
34.95039.02539.000
35.08534.990
0.1350.015
3530DUB 30.2529.75
4030DUB40 44
30.2529.75 39.975
39.95044.02544.000
40.08539.9904050DUB 50.25
49.75
4530DUB45 50
2.5052.460
30.2529.75 44.975
44.95050.02550.000
45.10544.990
0.1550.0154550DUB 50.25
49.75
5040DUB50 55
40.2539.75 49.975
49.95055.03055.000
50.11049.990
0.1600.0155060DUB 60.25
59.75
5540DUB 55 60 40.2539.75
54.97054.940
60.03060.000
55.11054.990
0.1700.020
6040DUB
60 65
40.2539.75
59.97059.940
65.03065.000
60.11059.990
6050DUB 50.2549.75
6060DUB 60.2559.75
6070DUB 70.2569.75
6570DUB 65 70 70.2569.75
64.97064.940
70.03070.000
65.11064.990
Part No.
Nominal Diameter
Wall thickness s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aass. in H6/H7
housing
Clearance CD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
44
8 Standard Products
8.6 DUB Flanged Bushes
All dimensions in mm
7050DUB70 75 2.505
2.460
50.2549.75
f7
69.97069.940
H7
75.03075.000
70.11069.990 0.170
0.0207070DUB 70.2569.75
7580DUB 75 80 80.2579.75
74.97074.940
80.03080.000
75.11074.990
8060DUB80 85
2.4902.440
60.5059.50
h8
80.00079.946
85.03585.000
80.15580.020
0.2010.02080100DUB 100.50
99.50
85100DUB 85 90 100.5099.50
85.00084.946
90.03590.000
85.15585.020
0.2090.020
9060DUB90 95
60.5059.50 90.000
89.94695.03595.000
90.15590.02090100DUB 100.50
99.50
95100DUB 95 100 100.5099.50
95.00094.946
100.035100.000
95.15595.020
10060DUB100 105
60.5059.50 100.000
99.946105.035105.000
100.155100.020100115DUB 115.50
114.50
105115DUB 105 110 115.50114.50
105.000104.946
110.035110.000
105.155105.020
110115DUB 110 115 115.50114.50
110.000109.946
115.035115.000
115.155115.020
Part No.
Nominal Diameter
Wall thickness s3
WidthB
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,aass. in H6/H7
housing
Clearance CD
Di Domax.min.
max.min.
max.min.
max.min.
max.min.
max.min.
D
i(D
i,a)
Do
rmax
0.3
min
.
Dfl
Co
Ci
B
20° ±8°
Z
sfl
Do - Di
2
s 3
Detail Z
Split
Dimensions and Tolerances according to ISO 3547 and GSP-Specifications
Part No.
Nominal Diameter
Wall thickness
s3
Flange thickness
sfl
Flange-∅ Dfl
Width B
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,a Ass. in H6/H7 housing
Clearance CD
Di Domaxmin.
max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
max. min.
BB0304DUB 3 4.5 0.7500.730
0.800.70
7.506.50 4.25
3.75 h6
3.0002.994 H6
4.5084.500
3.0483.000
0.0540.000
BB0404DUB 4 5.5 9.508.50
4.0003.992
5.5084.500
4.0484.000
0.0560.000
BB0505DUB 5 7 1.0050.980
1.050.80
10.509.50
5.254.75 f7 4.990
4.978 H7 7.0157.000
5.0554.990
0.0770.000
Outside Co and Inside Ci chamfers
a = Chamfer Co machined or rolled at the opinion of the manufacturer
b = Ci can be a radius or a chamfer in accordance with ISO 13715
Wall thickness s3
Co (a)Ci (b)
machined rolled0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4
1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.51.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7
Wall thickness s3
Co (a)Ci (b)
machined rolled2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7
2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0
45
8Standard Products
BB0604DUB6 8
1.0050.980
1.050.80
12.5011.50
4.253.75
f7
5.9905.978
H7
8.0158.000
6.0555.990
0.0770.000BB0608DUB 8.25
7.75
BB0806DUB8 10 15.50
14.50
5.755.25 7.987
7.97210.01510.000
8.0557.990
0.0830.000BB0810DUB 9.75
9.25
BB1007DUB10 12 18.50
17.50
7.256.75 9.987
9.97212.01812.000
10.0589.990
0.0860.003BB1012DUB 12.25
11.75
BB1207DUB
12 14 20.5019.50
7.256.75
11.98411.966
14.01814.000
12.05811.990
0.0920.006
BB1209DUB 9.258.75
BB1212DUB 12.2511.75
BB1417DUB 14 16 22.5021.50
17.2516.75
13.98413.966
16.01816.000
14.0513.990
BB1512DUB15 17 23.50
22.50
12.2511.75 14.984
14.96617.01817.000
15.05814.990BB1517DUB 17.25
16.75
BB1612DUB16 18 24.50
23.50
12.2511.75 15.984
15.96618.01818.000
16.05815.990BB1617DUB 17.25
16.75
BB1812DUB18 20 26.50
25.50
12.2511.75 17.984
17.96620.02120.000
18.06117.990
0.0950.006BB1822DUB 22.25
21.75
BB2012DUB20 23
1.5051.475
1.601.30
30.5029.50
11.7511.25 19.980
19.95923.02123.000
20.07119.990
0.1120.010
BB2017DUB 16.7516.25
BB2512DUB25 28 35.50
34.50
11.7511.25 24.980
24.95928.02128.000
25.07124.990BB2522DUB 21.75
21.25
BB3016DUB30 34
2.0051.970
2.101.80
42.5041.50
16.2515.75 29.980
29.95934.02534.000
30.08529.990
0.1260.010BB3026DUB 26.25
25.75
BB3526DUB 35 39 47.5046.50
26.2525.75
34.97534.950
39.02539.000
35.08534.990
0.1350.015
BB4026DUB 40 44 53.5052.50
26.2525.75
39.97539.950
44.02544.000
40.08539.990
0.1350.015
BB4526DUB 45 50 2.5052.460
2.602.30
58.5057.50
26.2525.75
44.97544.950
50.02550.000
45.10544.990
0.1550.015
Part No.
Nominal Diameter
Wall thickness
s3
Flange thickness
sfl
Flange-∅ Dfl
Width B
Shaft-∅DJ [h6, f7, h8]
Housing−∅DH [H6, H7]
Bush-∅ Di,a Ass. in H6/H7 housing
Clearance CD
Di Domaxmin.
max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
max. min.
46
8 Standard Products
8.7 DU Cylindrical Bushes - Inch sizes
All dimensions in inch
Ci
Co
.012
min
.
α
β
Di
Do
(Di,a
)s 3
B
ZDetail Z
Split
Part No.Nominal Diameter Wall thickness
s3
WidthB
Shaft-∅DJ
Housing-∅DH
Bush-∅ Di,aAss. in DH housing
Clearance CD
Di Do B max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
02DU021/8 3/16
1/8
0.03150.0305
0.13500.1150 0.1243
0.12360.18780.1873
0.12680.1243
0.00320.000002DU03 3/16
0.19750.1775
025DU0255/32
7/32
5/320.166250.14265 0.1554
0.15470.21910.2186
0.15810.1556
0.00340.0002025DU04 1/4
0.26000.2400
03DU03
3/161/4
3/160.19750.1775
0.18650.1858
0.25030.2497
0.18930.1867
0.00350.000203DU04 1/4
0.26000.2400
03DU06 3/80.38500.3650
04DU041/4 5/16
1/40.26000.2400 0.2490
0.24810.31280.3122
0.25180.2492
0.00370.0002
04DU06 3/80.38500.3650
05DU065/16
3/8
3/80.38500.3650 0.3115
0.31060.37530.3747
0.31430.311705DU08 1/2
0.51000.4900
06DU06
3/8 15/32
3/8
0.04710.0461
0.38500.3650
0.37400.3731
0.46910.4684
0.37690.3742
0.00380.000206DU08 1/2
0.51000.4900
06DU12 3/40.76000.7400
07DU087/16
17/32
1/20.51000.4900 0.4365
0.43550.53160.5309
0.43940.4367
0.00390.000207DU12 3/4
0.76000.7400
08DU06
1/2 19/32
3/80.38500.3650
0.49900.4980
0.59410.5934
0.50190.4992
0.00390.0002
08DU08 1/20.51000.4900
08DU10 5/80.63500.6150
08DU14 7/80.88500.8650
09DU089/16
21/32
1/20.51000.4900 0.5615
0.56050.65660.6559
0.56440.561709DU12 3/4
0.76000.7400
ID and OD chamfersDi Co α Ci β
1/8" - 5/16" 0.008" - 0.024" 30°-45° 0.004" - 0.012" 30°-45°3/8" - 11/16" 0.020" - 0.040" 20°-30° 0.005" - 0.025" 40°-55°
3/4" - 7" 0.020" - 0.040" 15°-25° 0.005" - 0.025" 40°-50°
47
8Standard Products
10DU08
5/8 23/32
1/2
0.04710.0461
0.51000.4900
0.62400.6230
0.71920.7184
0.62700.6242 0.0040
0.0002
10DU10 5/80.63500.6150
10DU12 3/40.76000.7400
10DU147/8
0.88500.8650
11DU14 11/1625/32
0.88500.8650
0.68650.6855
0.78170.7809
0.68950.6867
12DU08
3/4 7/8
1/2
0.06270.0615
0.51000.4900
0.74910.7479
0.87550.8747
0.75250.7493
0.00460.0002
12DU12 3/40.76000.7400
12DU16 1 1.01000.9900
14DU12
7/8 1
3/40.76000.7400
0.87410.8729
1.00050.9997
0.87750.874314DU14 7/8
0.88500.8650
14DU16 1 1.01000.9900
16DU12
1 11/8
3/40.76000.7400
0.99910.9979
1.12561.1246
1.00260.9992
0.00470.000116DU16 1 1.0100
0.9900
16DU24 11/21.51001.4900
18DU1211/8 19/32
3/4
0.07840.0770
0.76000.7400 1.1238
1.12261.28181.2808
1.12781.1240
0.00520.000218DU16 1 1.0100
0.9900
20DU12
11/4 113/32
3/40.76000.7400
1.24881.2472
1.40681.4058
1.25281.2490
0.00560.0002
20DU16 1 1.01000.9900
20DU20 11/41.26001.2400
20DU28 13/41.76001.7400
22DU16
13/8 117/32
1 1.01000.9900
1.37381.3722
1.53181.5308
1.37781.374022DU22 13/8
1.38501.3650
22DU28 13/41.76001.7400
24DU16
11/2 121/32
1 1.01000.9900
1.49881.4972
1.65681.6558
1.50281.4990
24DU20 11/41.26001.2400
24DU24 11/21.51001.4900
24DU32 2 2.01001.9900
26DU1615/8 125/32
1 1.01000.9900 1.6238
1.62221.78181.7808
1.62781.6240
0.00560.000226DU24 11/2
1.51001.4900
28DU16
13/4 115/16
1
0.09410.0923
1.01000.9900
1.74871.7471
1.93811.9371
1.75351.7489
0.00640.0002
28DU24 11/21.51001.4900
28DU28 13/41.76001.7400
28DU32 2 2.01001.9900
Part No.Nominal Diameter Wall thickness
s3
WidthB
Shaft-∅DJ
Housing-∅DH
Bush-∅ Di,aAss. in DH housing
Clearance CD
Di Do B max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
48
8 Standard Products
30DU16
17/8 21/16
1
0.09410.0923
1.01000.9900
1.87371.8721
2.06332.0621
1.87871.8739
0.00660.000230DU30 17/8
1.88501.8650
30DU36 21/42.26002.2400
32DU16
2 23/16
1 1.01000.9900
1.99871.9969
2.18832.1871
2.00371.9989
0.00680.0002
32DU24 11/21.51001.4900
32DU32 2 2.01001.9900
32DU40 21/22.51002.4900
36DU32
21/4 27/16
2
0.09280.0902
2.01001.4900
2.25072.2489
2.43772.4365
2.25732.2509
0.00840.0002
36DU36 21/42.26002.2400
36DU40 21/22.51002.4900
36DU48 3 3.01002.9900
40DU32
21/2 211/16
2 2.01001.9900
2.50112.4993
2.68812.6869
2.50772.5013
40DU40 21/22.51002.4900
40DU48 3 3.01002.9900
40DU56 31/23.51003.4900
44DU32
23/4 215/16
2 2.01001.9900
2.75002.7482
2.93702.9358
2.75662.7502
44DU40 21/22.51002.4900
44DU48 3 3.01002.9900
44DU56 31/23.51003.4900
48DU32
3 33/16
21/22.51002.4900
3.00002.9982
3.18723.1858
3.00683.0002
0.00860.000248DU48 3 3.0100
2.9900
48DU60 33/43.76003.7400
56DU40
31/2 311/16
21/22.51002.4900
3.50003.4978
3.68723.6858
3.50683.5002
0.00900.000256DU48 3 3.0100
2.9900
56DU60 33/43.76003.7400
64DU48
4 43/16
3 3.01002.9900
4.00003.9978
4.18724.1858
4.00684.0002
0.00900.000264DU60 33/4
3.76003.7400
64DU76 43/44.76004.7400
80DU485 53/16
3 3.01002.9900 4.9986
4.99615.18605.1844
5.00564.9988
0.00950.0002
80DU60 33/43.76003.7400
96DU486 63/16
3 3.01002.9900 6.0000
5.99756.18746.1858
6.00706.000296DU60 33/4
3.76003.7400
112DU60 7 73/16 33/43.76003.7400
6.99546.9929
7.18307.1812
7.00266.9956
0.00970.0002
Part No.Nominal Diameter Wall thickness
s3
WidthB
Shaft-∅DJ
Housing-∅DH
Bush-∅ Di,aAss. in DH housing
Clearance CD
Di Do B max.min.
max.min.
max.min.
max.min.
max.min.
max.min.
49
8Standard Products
8.8 DU Thrust Washers - Inch sizes
All dimensions in inch
dP
Di
Do
sT
Ha
Do
d p
dD
Hd
[D10
]
DJ
Part No.
Inside-∅Di
Outside-∅Do
Thickness sT
Dowel Hole Recess DepthHa∅ dD PCD-∅ dP
max. min. max. min. max.min.
max.min.
max.min.
max.min.
DU06 0.510 0.500 0.875 0.865
0.0630.061
0.0770.067
0.6920.682
0.0500.040
DU07 0.572 0.562 1.000 0.990 0.7860.776
DU08 0.635 0.625 1.125 1.115
0.1090.099
0.8800.870
DU09 0.697 0.687 1.187 1.177 0.9420.932
DU10 0.760 0.750 1.250 1.240 1.0050.995
DU11 0.822 0.812 1.375 1.365 1.0991.089
DU12 0.885 0.875 1.500 1.490 0.1400.130
1.1921.182
DU14 1.010 1.000 1.750 1.740 1.3801.370
DU16 1.135 1.125 2.000 1.990
0.1710.161
1.5671.557
DU18 1.260 1.250 2.125 2.115 1.6921.682
DU20 1.385 1.375 2.250 2.240 1.8171.807
DU22 1.510 1.500 2.500 2.490
0.2020.192
2.0051.995
DU24 1.635 1.625 2.625 2.615 2.1302.120
DU26 1.760 1.750 2.750 2.740 2.2552.245
DU28 2.010 2.000 3.000 2.990
0.0930.091
2.5052.495
0.0800.070DU30 2.135 2.125 3.125 3.115 2.630
2.620
DU32 2.260 2.250 3.250 3.240 2.7552.745
50
8 Standard Products
8.9 DU Strip
All dimensions in mm
8.10DUB StripAll dimensions in mm
8.11DU Strip - Inch sizesDU Strip Inch sizes are available as Non-Standard products, on request.
ss
Wu
min
L
W
Part No.Length L
Total Width W Usable Width WU min
Thickness sS
max.min.
max.min.
S07150DU
503500
160 150 0.740.70
S10190DU 200 190 1.010.97
S15240DU
254 240
1.521.48
S20240DU 2.001.96
S25240DU 2.502.46
S30240DU 3.063.02
Part No.Length L
Total Width W Usable Width WU min
Thickness sS
max.min.
max.min.
S07085DUB
503500
95 85 0.740.70
S10180DUB
193 180
1.010.97
S15180DUB 1.521.48
S20180DUB 2.001.96
S25180DUB 2.502.46
51
9Test Methods
9 Test Methods9.1 Measurement of Wrapped BushesIt is not possible to accurately measure the external and inter-nal diameters of a wrapped bush in the free condition. In itsfree state a wrapped bush will not be perfectly cylindrical andthe butt joint may be open. When correctly installed in a hou-sing the butt joint will be tightly closed and the bush will con-form to the housing.
For this reason the external diameter and internal diameter ofa wrapped bush can only be chekked with special gauges andtest equipment.The checking methods are defined in ISO 3547 Part 1 and 2and ISO 12306 respectively.
Test A of ISO 3547 Part 2Checking the external diameter in a test machine withchecking blocks and adjusting mandrel.
Fig. 34: Test A, Data for drawing
Table 14: Test A of ISO 3547 Part 2
Test B (alternatively to Test A)Check external diameter with GO and NOGO ring gauges.
Test CChecking the internal diameter of a bush pressed into a ringgauge, which nominal diameter corresponds to the dimensionspecified in table 5 of ISO 3547 Part 2 (Example Di = 20 mm).
Fig. 35: Test C, Data for drawing
Measurement of Wall Thickness (alternatively to Test C)The wall thickness is measured at one, two or three positionsaxially according to the bearing dimensions.
Fig. 36: Measurement position Table 15: Measurement position
Test DCheck external diameter by precision measuring tape.
Checking block
Split
dch,1
Fch
z
Test A of ISO 3547 Part 2 on 2015DUChecking block and setting mandrel dch,1 23.062 mmTest force Fch 4500 NLimits for ∆z 0 and -0.065 mmBush Outside diameter Do 23.035 to 23.075 mm
20.06120.001
Bush inserted in ring gauge ∅ 23.011 mm
A
A
∅ 0.050
X X measurement position
BB [mm] X [mm] measurement
position≤15 B/2 1
>15 ≤50 4 2>50 ≤90 6 and B/2 3
>90 8 and B/2 3
52
9 Test Methods
©2007 GGB. All rights reserved.www.ggbearings.com
This handbook was designed by Profidoc Silvia Freitag
www.profidoc.de
06-07
GGB warrants that products described in this brochure are free from defects in workmanship and material but unless expressly agreed in wri-ting GGB gives no warranty that these products are suitable for any par-ticular purpose of for use under any specific conditions notwithstanding that such purpose would appear to be covered by this publication. GGB accepts no liability for any loss, damage, or expense whatsoever arising directly or indirectly from use of its products. All business undertaken by GGB is subject to its standard Conditions of Sale, copies of which are available upon request. GGB products are subject to continual develop-ment and GGB reserves the right to make changes in the specification and design of its products without prior notice.
GGBTM is a trademark of GGB.
DU® is a trademark of GGB.
DU®B is a trademark of GGB.
Health Hazard - WarningThere are two separate aspects of health hazard which could arise from certain usage of DU materials.FabricationAt temperatures up to 250 °C the polytetrafluroethylene (PTFE) present in the lining material is completely inert so that even on the rare occasi-ons in which DU bushes are drilled, or sized, after assembly there is no danger in boring or burnishing. At higher temperatures however, small quantities of toxic fumes can be produced and the direct inhalation of these can cause an influenza type of illness which may not appear for some hours but which subsides wit-hout after-effects in 24-48 hours. Such fumes can arise from PTFE particles picked up on the end of a cigarette. Therefore smoking should be prohibited where DU is being machined.Lead contamination of food, drink and other edible products
DU contains a small quantity of metallic lead (0.25 kg/m2 of total bearing surface) and the designer should ensure that this does not contaminate any edible product being processed to the extent that it might cause a health hazard. The majority of the lead is retained in the bearing, and that which escapes does so over a long period of time. The highest rate of release occurs during the bedding-in period which normally lasts for 1-2% of the life of the bearing. As a guide a MB2525DU bush with unidirectional load will emit 0.05 g of lead in the bedding-in wear debris with a further 0.1g during the remaining 98% of the bearing life. 0.05g is sufficient, if evenly distributed, to contaminate 100 kg of food product to 0.5 ppm or 1000 litres of liquid to 0.05 ppm. If the rate of food processing is comparable to or less than these quantities per 1% of the bearing life, it should be sea-led so as to prevent wear debris contaminating the product. These quan-tities are proportional to the surface area of the bearing and should be factored for other sizes, and increased by a factor of 3 if there is a rota-ting load. Where lead emission rates approach the critical level, and sealing is not effective, adequate prototype testing should be carried out to determine the bearing's operating life. Adverse conditions (extraneous material in the bearing, overloading etc) can decrease the life of the bearing and therefore increase the lead emission rates.
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