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Hollow Section (HSS) ConnectionsThe Hollo-Bolt® and Lindibolt™ eliminate the need for conventional through-bolting or welding of hollow structural section (HSS) or any steel structure where access is only available from one side.
Both the Lindibolt and Hollo-Bolt enable fast, safe construction and can be swiftly installed by simply inserting the product into pre-drilled holes, then tightening to the recommended tightening torque using hand tools.
In the late 1940s, Lindapter revolutionized ‘blind connections’ with the development of the original Lindibolt, for situations where access to both sides of the steel was restricted. Following the introduction and wide acceptance of HSS, the Hollo-Bolt was invented to suit virtually any type of hollow section, including square, rectangular, circular and oval profiles. As with all Lindapter products, the R&D department has continued to develop the range with the rapid expansion in diameters, lengths, finishes and head types.
Following comprehensive testing, The Steel Construction Institute (SCI) and British Constructional Steelwork Association (BCSA) recognize the Hollo-Bolt as a primary structural connection, in the design guide ‘Joints in Steel Construction – Simple Connections’. The American Institute of Steel Construction (AISC) also recognizes the Hollo-Bolt as a HSS connection in the Steel Construction Manual.
Typical Hollo-Bolt applications include:• Primary Connections• Secondary Connections• Bridges• Cladding• Balconies• Towers and masts• Staircases and handrails • Glazing and roofs
The Original Expansion Bolt for Structural Steel is ICC-ES approved for compliance with the International Building Code®
2Hollow Section (HSS) Connections
This catalog includes extracts from ESR-3330, including Hollo-Bolt Design Data:
> Load and Resistance Factor Design (LRFD) Method> Allowable Strength Design (ASD) Method
Download the full report from www.LindapterUSA.com or the ICC-ES website: www.icc-es.org/Reports/pdf_files/ESR-3330.pdf
Exclusive Hollo-Bolt features:4 Highest resistance to tensile loading in accordance with AC4374 For use in Seismic Design Categories (SDC) A, B and C4 Available with Hot Dip Galvanized coating4 Standard product at standard pricing4 All product sizes from 5/16” to 3/4” 4 Available off-the-shelf from your local distributor4 Patented High Clamping Force design (sizes 5/8” and 3/4”)
ICC
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39
Type HB - Hollo-Bolt®
Steel, bright zinc plated plus JS 500 Steel, sheraplexSteel, hot dip galvanized Stainless Steel Grade 316
Suitable for hollow sections, tubes and where access is available from one side only. The Hollo-Bolt is continuously developed to meet the requirements of Structural Engineers, with recent performance improvements including the patented High Clamping Force (HCF) version (see page 40). The Hollo-Bolt is protected by multiple international patents and registered designs.
Hexagonal Countersunk (Bolt Head)
Flush Fit
Countersunk (Bolt Head) Visible protrusion: MinimalThis discreet midway option has a smaller protrusion for the perfect balance of appearance and convenience, and features a Grade 10.9 (A490 equivalent) countersunk bolt with a special collar designed to accommodate the entire bolt head. Drilling countersunk holes in the steel section is not required.
Flush FitVisible protrusion: ZeroThe innovative Flush Fit Hollo-Bolt is entirely concealed within a drilled countersunk hole once installed, leaving no protrusion above the surface of the steel section - the perfect solution for architects!
Lindapter Hollo-Bolt Head Variations
HexagonalVisible protrusion: RegularThe Hollo-Bolt collar and hexagonal head of the Grade 8.8 bolt (Grd. 5 / A325 equivalent) are evident above the surface of the steel section. This head variant is the usual choice for the majority of HSS connections, or where architects favor an ‘industrial’ look.
Hollo-Bolt®
M8 ( 5/16” )
M10 ( 3/8” )
M12 ( 1/12” )
M16 ( 5/8” )
M20 ( 3/4” )
Bright Zinc Plated & JS500
Stainless Steel(Grade 316)
Sheraplex Hot DipGalvanized
Hex Head 3 3 3 3 3 3 3 3 3
Countersunk 3 3 3 3 3 3 3
Flush Fit 3 3 3 3 3 3
Availability of Head Variations High Clamping Force (HCF)
Sizes M16 ( 5/8” ) and M20 ( 3/4” ), known as the Hollo-Bolt HCF, feature a patented High Clamping Force mechanism to produce three times more clamping force than the same sized product without the mechanism. The significance of clamping force and the superior performance of Lindapter’s unique Hollo-Bolt HCF is illustrated on page 40.
2Hollow Section (HSS) ConnectionsType HB - Hollo-Bolt®
Also available: Engineered SolutionsVisible protrusion: CustomizedFor the rare connection requirement that an off-the-shelf Hollo-Bolt cannot fulfil, Lindapter’s Research & Development Facility has the capability to design and manufacture custom connection solutions. The example (left) shows the Security / Button Head. Contact Lindapter to discuss your requirement.
Approved
ICC
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A typical connection is made by inserting the Hollo-Bolt into the pre-drilled holes of the fixture and hollow section. As the bolt head is tightened, the cone is pulled up the bolt thread, causing the legs of the sleeve to expand until the cone locks the sleeve against the inner wall of the hollow section.
At full tightening torque, a clamping action is set up between the fixture and steel section to form a secure connection.
Working closely with Structural Engineers & Steel Fabricators, Lindapter identified the need for the larger M16 (5/8”) & M20 (3/4”) Hollo-Bolts to have an increased clamping force suitable for higher strength structural connections. Research & Development led to the invention of the patented 5-part design, optimized for superior performance.
The High Clamping Force (HCF) mechanism consists of a special washer that ‘compresses’ to significantly increase clamping force between the fixture and hollow section, when compared to a 3-part product of the same size, thereby reducing displacement.
= Clamping ForceCone(interlocking grooves prevent loosening)
Bolt
Hollo-Bolt Collar
Sleeve(legs expand during installation)
3x CLAMPING
FORCE
The Hollo-Bolt is available in two versions: the original 3-part design for general hollow section connections and the larger sized 5-part High Clamping Force (HCF) version, for higher strength structural connections.
Hollo-Bolt & Hollo-Bolt HCF
40
M85/16”
HIGH CLAMPING
FORCE
2Hollow Section (HSS) ConnectionsHigh Clamping Force (HCF)
M103/8”
M121/2”
Hollo-Bolt HCF
M165/8”
M203/4”
= Clamping Force
Cone(interlocking grooves prevent loosening)
Bolt
Collar
Sleeve(legs expand during installation)
High Clamping Force Mechanism
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41
M16 (5/8”): Connection Load Vs Ply Displacement
Loa
d (
lbs)
Displacement (Inches)
2000
4000
0
6000
8000
10000
12000
14000
16000
18000
20000
22000
0.1250
DisplacementThe significance of increased clamping force is shown in the graphs above. The blue curve demonstrates the superior performance of the Hollo-Bolt HCF in contrast to M16 (5/8”) & M20 (3/4”) sized products without Lindapter’s patented HCF mechanism (i.e. the 3-part design in these larger sizes). When using the Hollo-Bolt HCF, displacement (movement in the connection) is minimized at Safe Working Load for a safer and more secure connection.
With HCF Mechanism 5-Part Design (Hot Dip Galvanized, Size 2)
Without HCF Mechanism 3-Part Design (Hot Dip Galvanized, Size 2)
Loa
d (
lbs)
M20 (3/4”): Connection Load Vs Ply Displacement
Displacement (Inches)
0
0
4000
8000
12000
16000
20000
24000
28000
32000
0.10.0750.050.025 0.1250.10.0750.050.025
Safe Working Load
Hollo-Bolt HCF Typical Performance Increase
00
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
Cla
mpin
g F
orc
e (l
bs)
Time (minutes)
M16 (5/8”): Up to 3x Clamping Force
14000
15000
20 40 60 80 100 120
2Hollow Section (HSS) ConnectionsHigh Clamping Force (HCF)
Clamping ForceAs with any structural bolt, immediately after installation the bolt relaxes until a typical clamping force is reached. The typical clamping force of the Hollo-Bolt HCF is over three times higher than the same sized product without the HCF mechanism. This results in a more secure connection and a greater force that has to be overcome before displacement begins.
00
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
Cla
mpin
g F
orc
e (l
bs)
Time (minutes)
14000
15000
20 40 60 80 100 120
M20 (3/4”): Up to 3x Clamping Force
HIGH CLAMPING
FORCE
Safe Working Load
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42
The Hollo-Bolt can be used on a wide variety of steel hollow sections; safe working loads shown are based on use in A36 Structural Tube. The safe working loads, in both tension and shear, are applicable to the Hollo-Bolt only. Failure of the section, particularly on those with thin walls and a wide chord face, could occur at a lower figure and strength of the section should be checked by a qualified Structural Engineer.
Hexagonal Flush Fita b c
Hollo-Bolt - Safe Working Loads
FLUSH FIT
Product Code
Countersunk Bolt
Clamping Thickness
Outer Ply
Sleeve Length
Collar InstallationNut
Tightening Torque
Safe Working Loads
W min t L H D A/Fft lb
Tensilelbs
Single Shearlbs
LHBFF08#1 5/16” x 2” 3/8” - 11/16” 5/16” 13/16”
LHBFF08#2 5/16” x 23/4” 11/16” - 13/4” 5/16” 21/8” 13/64” 15/16” 3/4” 17 899 1124
LHBFF08#3 5/16” x 35/8” 13/4” - 21/2” 5/16” 27/8”
LHBFF10#1 3/8” x 2” 1/2” - 11/16” 3/8” 13/16”
LHBFF10#2 3/8” x 23/4” 11/16” - 13/4” 3/8” 21/8” 15/64” 13/16” 15/16” 33 1910 2248
LHBFF10#3 3/8” x 35/8” 13/4” - 21/2” 3/8” 27/8”
LHBFF12#1 1/2” x 23/16” 1/2” - 13/16” 3/8” 13/8”
LHBFF12#2 1/2” x 35/32” 13/16” - 21/32” 3/8” 21/2” 9/32” 15/16” 13/16” 59 2360 3372
LHBFF12#3 1/2” x 4” 21/32” - 27/8” 3/8” 33/8”
c
Across Flats
L
D
H
W
min t
W
H L
D
A/F
min t
Countersunk (Bolt Head)
HEXAGONAL COUNTERSUNK
Product Code
Bolt Product Code
Counter-sunk Bolt
Clamping Thickness
Outer Ply
Sleeve Length
CollarHeight Ø
Tightening Torque
Safe Working Loads
W min t L H D A/Fft lb
Tensilelbs
Single Shearlbs
LHBM08#1 5/16” x 2” LHBCSKM08#1 5/16” x 2” 1/8” - 7/8” - 13/16”
LHBM08#2 5/16” x 23/4” LHBCSKM08#2 5/16” x 23/4” 7/8” - 15/8” - 115/16” 3/16” 7/8” 3/4” 17 899 1124
LHBM08#3 5/16” x 39/16” LHBCSKM08#3 5/16” x 39/16” 15/8” - 23/8” - 211/16”
LHBM10#1 3/8” x 23/16” LHBCSKM10#1 3/8” x 2” 1/8” - 7/8” - 13/16”
LHBM10#2 3/8” x 23/4” LHBCSKM10#2 3/8” x 23/4” 7/8” - 15/8” - 17/8” 1/4” 11/8” 15/16” 33 1910 2248
LHBM10#3 3/8” x 39/16” LHBCSKM10#3 3/8” x 39/16” 15/8” - 23/8” - 25/8”
LHBM12#1 1/2” x 23/8” LHBCSKM12#1 1/2” x 23/16” 1/8” - 1” - 13/8”
LHBM12#2 1/2” x 35/32” LHBCSKM12#2 1/2” x 35/32” 1” - 113/16” - 21/4” 1/4” 11/4” 13/16” 59 2360 3372
LHBM12#3 1/2” x 4” LHBCSKM12#3 1/2” x 4” 113/16” - 23/4” - 31/8”
LHBM16#1 5/8” x 3” LHBCSKM16#1 5/8” x 23/4” 1/2” - 11/8” 5/16” 15/8”
LHBM16#2 5/8” x 4” LHBCSKM16#2 5/8” x 4” 11/8” - 2” 5/16” 21/2” 5/16” 11/2” 13/8” 140 4720 6744
LHBM16#3 5/8” x 43/4” LHBCSKM16#3 5/8” x 43/4” 2” - 213/16” 5/16” 35/16”
LHBM20#1 3/4” x 39/16” - - 1/2” - 15/16” 5/16” 115/16”
LHBM20#2 3/4” x 43/4” - - 15/16” - 23/8” 5/16” 3” 3/8” 2” 113/16” 221 7868 8992
LHBM20#3 3/4” x 57/8” - - 23/8” - 33/8” 5/16” 4”
(5:1 Factor of Safety)
a b
High
Cla
mpi
ng F
orce
(HCF
)
High Clamping Force MechanismSize M16 (5/8”) - M20 (3/4”)
2Hollow Section (HSS) ConnectionsDesign Data
Sizes M16 ( 5/8” ) and M20 ( 3/4” ), known as the Hollo-Bolt HCF, feature a patented High Clamping Force mechanism to produce three times more clamping force than the same sized product without the mechanism. The significance of clamping force and the superior performance of Lindapter’s unique Hollo-Bolt HCF is illustrated on page 40.
(5:1 Factor of Safety)
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43
2Hollow Section (HSS) ConnectionsDesign Data
ALLOWABLE LOADING
Product Code
Bolt Max Clamping Range
Outer Ply
Sleeve Length
Collar Height Ø
Tightening Torque
LRFD Method ASD Method
W min t L H D A/Fft lb
Tensilelbs
Shearlbs
Tensilelbs
Shearlbs
LHBM08#1 5/16” x 2” 1/8” - 7/8” - 13/16”
LHBM08#2 5/16” x 23/4” 7/8” - 15/8” - 115/16” 3/16” 7/8” 3/4” 17 3775 3215 899 1124
LHBM08#3 5/16” x 39/16” 15/8” - 23/8” - 211/16”
LHBM10#1 3/8” x 23/16” 1/8” - 7/8” - 13/16”
LHBM10#2 3/8” x 23/4” 7/8” - 15/8” - 17/8” 1/4” 11/8” 15/16” 33 6160 5485 1910 2248
LHBM10#3 3/8” x 39/16” 15/8” - 23/8” - 25/8”
LHBM12#1 1/2” x 23/8” 1/8” - 1” - 13/8”
LHBM12#2 1/2” x 35/32” 1” - 113/16” - 21/4” 1/4” 11/4” 13/16” 59 8545 7485 2360 3372
LHBM12#3 1/2” x 4” 113/16” - 23/4” - 31/8”
LHBM16#1 5/8” x 3” 1/2” - 11/8” 5/16” 15/8”
LHBM16#2 5/8” x 4” 11/8” - 2” 5/16” 21/2” 5/16” 11/2” 13/8” 140 13915 6744 4720 6744
LHBM16#3 5/8” x 43/4” 2” - 213/16” 5/16” 35/16”
LHBM20#1 3/4” x 39/16” 1/2” - 15/16” 5/16” 115/16”
LHBM20#2 3/4” x 43/4” 15/16” - 23/8” 5/16” 3” 3/8” 2” 113/16” 221 19985 8992 7868 8992
LHBM20#3 3/4” x 57/8” 23/8” - 33/8” 5/16” 4”
Hollo-Bolt Allowable Loading (LRFD & ASD Methods)
“ Hollo-Bolt fasteners are designed for connecting structural steel to hollow structural section (HSS) steel members and other structural steel elements where access is difficult or restricted to one side only. Hollo-Bolt fasteners are intended for use with rectangular or square HSS members
and are recognized for resisting static tension and shear loads in bearing-type connections. The fasteners are alternatives to bolts described in Section J3 of AISC 360, which is referred in Section 2205.1 of the 2009 International Building Code (IBC) for bearing-type connections.
The Hollo-Bolt fasteners may be used to resist wind loads, and seismic loads in Seismic Design Categories A, B and C.
Extract from ESR-3330
“
Significance of ESR-3330
ICC-ES, a subsidiary of the International Code Council, is the United States’ leading evaluation service for innovative building products and provides evidence that products meet the requirements of building codes and technical standards. Building officials, architects, contractors, specifiers, designers and fabricators utilize ICC-ES Evaluation Report ESR-3330 to provide a basis for using or approving the Hollo-Bolt in construction projects under the International Building Code®. ICC-ES President Shahin Moinian explains why ICC-ES Evaluation Report ESR-3330 is so important: “Lindapter USA can now reference the evaluation report to assure building officials and the building industry that the product meets I-Code requirements,” Moinian said. “Building departments have a long history of using evaluation reports, and ICC-ES operates as a technical resource with the highest quality of product review for the building department.”
ICC-ES Evaluation Reports are not to be construed as representing aesthetics or any other attributes not specifically addressed, nor are they to be construed as an endorsement of the subject of the report or a recommendation for its use. There is no warranty by ICC Evaluation Service, LLC, express or implied, as to any finding or other matter in this report, or as to any product covered by the report.
Copyright © 2014 Page 1 of 61000
ICC-ES Evaluation Report Issued March 1, 2014
This report is subject to renewal Month March 1, Renewal Year 2015.
www.icc-es.org | (800) 423-6587 | (562) 699-0543 A Subsidiary of the International Code Council®
DIVISION: 05 00 00—METALS Section: 05 05 02—METAL FASTENINGS
REPORT HOLDER:
LINDAPTER LINDSAY HOUSE, BRACKENBECK ROADBRADFORD, WEST YORKSHIREBD7 2NFUNITED KINGDOM 44 (0) 1274 521444 www.lindapter.comwww.lindapterusa.com
EVALUATION SUBJECT:
HOLLO-BOLT® 3 PART AND HOLLO-BOLT® 5 PART FASTENERS
1.0 EVALUATION SCOPE
Compliance with the following code:
2009 International Building Code® (IBC)
Property evaluated:
Structural
2.0 USES
Hollo-Bolt® Fasteners are designed for connecting structural steel to hollow structural section (HSS) steel members and other structural steel elements where access is difficult or restricted to one side only. Hollo-Bolt® fasteners are intended for use with rectangular or square HSS members and are recognized for resisting static tension and shear loads in bearing-type connections. The fasteners are alternatives to bolts described in Section J3 of AISC 360, which is referenced in Section 2205.1 of the IBC, for bearing-type connections.
The Hollo-Bolt® Fasteners may be used to resist wind loads, and seismic loads in Seismic Design Categories A, B and C.
3.0 DESCRIPTION
3.1 General:
Hollo-Bolt® 3 Part Fasteners are assembled from three components, consisting of the core bolt, the body (sleeve) including the shoulder (collar), and the cone. The steel core bolt features a threaded shank and hexagonal head. The body is a steel segmented hollow cylinder, with four
slits 90 degrees from each other. The collar is a circular element having two flat surfaces (to accommodate an open-ended wrench) with a circular hole integral with the sleeve. The cone is a steel circular internally threaded nut with grooves on the outer surface. Nominal Hollo-Bolt® sizes include 5/16 inch (M8), 3/8 inch (M10), 1/2 inch (M12), 5/8 inch (M16), and 3/4 inch (M20), with each size of bolt available in three lengths.
The Hollo-Bolt® 5 Part Fasteners are similar, except that they include a nitrile rubber washer and separate collar. Figure 1 provides a picture of the Hollo-Bolt® 3 Part and Hollo-Bolt® 5 Part. Table 1 provides part codes, design strengths, and installation information.
3.2 Materials:
3.2.1 Set Screw: The core bolt is manufactured from steel complying with EN ISO 898-1, Class 8.8, having a specified Fu of 116,030 psi (800 MPa).
3.2.2 Body (sleeve) with Integral Collar, Body (sleeve without collar), Collar and Cone: The parts are manufactured from free cutting carbon steel Grade 11SMn30 or 11SMnPb30, conforming to BS EN 10087, having a minimum tensile strength of 62,400 psi (430N/mm2) (sizes up to LHB16) or 56,500 psi (390N/mm2) (size LHB20); or cold drawn steel AISI C10B21, having a minimum tensile strength of 68,000 psi (470N/mm2).
3.2.3 Rubber Washer: The shore hardness is measured on the A scale 80-90.
3.2.4 Finish Coating: All components, except the rubber washer, are hot dipped galvanized/high temperature galvanized to BS EN ISO 1461, as described in the quality documentation.
4.0 DESIGN AND INSTALLATION
4.1 Design:
The fasteners are alternatives to bolts described in Section J3 of AISC 360, which is referenced in Section 2205.1 of the IBC, for bearing-type connections. The design of the Hollo-Bolt® Fasteners must comply with this report, Section J3 of AISC 360 and the strength design information for the Hollo-Bolt® provided in Table 1 of this report. The load-carrying capacity of the assembly depends on the fasteners, the type of elements connected, such as a HSS and its their cross
ESR-3330
Sizes M16 ( 5/8” ) and M20 ( 3/4” ), known as the Hollo-Bolt HCF, feature a patented High Clamping Force mechanism to produce three times more clamping force than the same sized product without the mechanism. The significance of clamping force and the superior performance of Lindapter’s unique Hollo-Bolt HCF is illustrated on page 40.
Download the report from the ICC-ES website: www.icc-es.org/Reports/pdf_files/ESR-3330.pdf
ICC
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44
Hexagonal Countersunk(Bolt Head)
Outer Ply
ClearanceHole Ø
Hole Distances
Edge Distances
min t d1 min A min B B + C
LHBM08 LHBCSKM08 - 9/16” 13/8” 1/2” 11/16”
LHBM10 LHBCSKM10 - 3/4” 19/16” 9/16” 7/8”
LHBM12 LHBCSKM12 - 13/16” 2” 3/4” 1”
LHBM16 LHBCSKM16 5/16” 11/16” 23/16” 13/16” 15/16”
LHBM20 - 5/16” 15/16” 23/4” 1” 15/16”
Ensure that holes are drilled in both the fixture and the section according to the drilling guidance below. Please note that clearance holes are slightly larger than standard bolt clearance holes to accommodate the sleeve and cone.
A B C
d1
min t
d1
a) Before tightening, ensure that the materials that are to be connected together are touching.b) Power tools, such as an impact wrench, may be used to speed up the tightening of the Hollo-Bolt. However, when using power tools, always complete the tightening process with a torque wrench to ensure the correct torque is applied to the Hollo-Bolt.
1. Align pre-drilled fixture and section and insert Hollo-Bolt a).
2. Grip the Hollo-Bolt collar with an open ended wrench.
3. Using a calibrated torque wrench, tighten the central bolt to the recommended torqueb).
INSTALLATION
Drilling & Preparation
Clearance holes can be drilled with a -0 / +1/16” tolerance.
Sizes M16 ( 5/8” ) and M20 ( 3/4” ) require the thickness of the outer ply (min t) to be at least 5/16”. If necessary, spacer washers should be used beneath the collar to increase the thickness to 5/16”.
2Hollow Section (HSS) ConnectionsInstallation Guidance
Hollo-Bolt Hexagonal & Countersunk (Bolt Head)
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min t
45
TypeOuter
PlyClearance
Hole Ø Countersunk
Ø DepthHole
DistancesEdge
Distances
min t d1 d2 t min A min B B + C
LHBM08FF 5/16” 9/16” 11/16” 1/4” 13/8” 1/2” 11/16”
LHBM10FF 3/8” 3/4” 11/4” 1/4” 19/16” 9/16” 7/8”
LHBM12FF 3/8” 13/16” 13/8” 5/16” 2” 3/4” 1”
A B C
d1
t1
d1
d2
90o
Ensure that countersunk holes are drilled in the fixture, and standard holes are drilled in the section, according to the drilling guidance below. Please note that clearance holes are slightly larger than standard bolt clearance holes to accommodate the sleeve and cone.
1. Align pre-drilled fixture and section and insert Hollo-Bolt a).
2. Apply installation nut and grip with an open ended adjustable wrench.
3. Using a calibrated torque wrench, tighten the central countersunk bolt to the recommended torqueb).
Installation Nut
2Hollow Section (HSS) ConnectionsInstallation Guidance
Drilling & Preparation
Hollo-Bolt Flush Fit
INSTALLATION
a) Before tightening, ensure that the materials that are to be connected together are touching.b) Power tools, such as an impact wrench, may be used to speed up the tightening of the Hollo-Bolt. However, when using power tools, always complete the tightening process with a torque wrench to ensure the correct torque is applied to the Hollo-Bolt.
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46
2Hollow Section (HSS) ConnectionsTypical Applications
HB001 HB002
HB003 HB004
HB005 HB006
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2Hollow Section (HSS) ConnectionsTypical Applications
HB008 HB009
HB010
HB012 HB013
HB011
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48
Hollo-Bolt®
by
For more information on the Hollo-Bolt, including a Global Project Portfolio and FAQs, request the new Hollo-Bolt Brochure today.
To request a copy, email or
2Hollow Section (HSS) ConnectionsTypical Applications
HB014 HB015
HB016
HB018
HB017
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