Hollow Section (HSS) Connections 2

© Lindapter International 2011

Hollow Section (HSS)ConnectionsThe Hollo-Bolt® and Lindibolt™ eliminate the needfor conventional through-bolting or welding ofhollow structural section (HSS) or any steelstructure where access is only available from oneside.

In the late 1940’s, Lindapter revolutionized ‘blindconnections’ with the development of the originalLindibolt™, for situations where access to bothsides of the steel was restricted. Following theintroduction and wide acceptance of HSS, theHollo-Bolt® was invented to suit virtually any type ofhollow section, including square, rectangular,circular and oval profiles. As with all Lindapterproducts, the R&D department has continued todevelop the range with the rapid expansion indiameters, lengths, finishes, and head types.

Following comprehensive testing, The SteelConstruction Institute (SCI) and BritishConstructional Steelwork Association (BCSA)recognise the Hollo-Bolt® as a primary structuralconnection, in the design guide ‘Joints in SteelConstruction – Simple Connections’. TheHollo-Bolt® is also approved by the DeutschesInstitut für Bautechnik and TÜV NORD.

Both the Lindibolt™ and Hollo-Bolt® enable fast andsafe construction and can be swiftly installed bysimply inserting the product into pre-drilled holes,then tightening to the recommended torque usinghand tools.

Typical Hollo-Bolt® applications include:

• Primary Connections

• Secondary Connections

• Bridges

• Cladding

• Balconies

• Towers and masts

• Staircases and handrails

• Glazing and roofs

Hollow Section (HSS) ConnectionsType HB - Hollo-Bolt® 2

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Flush Fit Countersunk(Head)

Hexagonal Head Socket HeadCap Screw

Button Head Security

M8 - M12 (5/16" - 1/2") M8 - M16 (5/16" - 5/8") M8 - M20 (5/16" - 3/4") M8 - M20 (5/16" - 3/4")Supplied to order

M8 - M12 (5/16" - 1/2")Supplied to order

Type HB - Hollo-Bolt®

Steel, bright zinc plated plus JS 500Steel, hot dip galvanizedStainless Steel Grade 316

Head Variations

Suitable for hollow sections, tubes and where access is available fromone side only. For corrosion protection, the Hollo-Bolt® comes withadditional JS500 protection as standard or hot dip galvanized.Sizes 5/8" and 3/4" have a patented collapse mechanism for optimizedclamping force.

Awarded the Design Council’s Millennium Product status forinnovation in the year 2000.

W

Hollo-Bolt®: M8, M10, M12(5/16", 3/8", 1/2")

Collar

H L

dD

W

Hollo-Bolt®: M16, M20 (5/8", 3/4")

H

Rubber Washer

L

dD

5/16"

Rubber Washer compressed /increased clamping force

Rubber Washer

Sleeve

Cone

Typical Applications(see also page 45)

Across Flats

A/F

Hollow Section (HSS) ConnectionsType HB - Hollo-Bolt® 2

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Type HB - Hollo-Bolt®

Order example: LHBM08#1 BZP plus JS 500

1) Type HB (LHBM16 and LHBM20 only) require the thickness of the outer ply to be at least 5/16". If necessary, spacer washers shouldbe used beneath the collar to increase the thickness to 5/16".

2) The Hollo-Bolt® can be used on a wide variety of steel hollow shape sections; safe working loads shown are based on use in A36structural 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 its strength should be checked by aqualified structural engineer.

Joints in Steel Construction - Simple Connections

Installation Hollo-Bolt®

Bolt Diameter, Hole and Edge Distances Type HB

1. Align pre-drilled fixture and steel.Insert Hollo-Bolt® through fixtureand steel.

2. Grip the Hollo-Bolt® collar withan open ended wrench.

3. Using a torque wrench,tighten the central bolt to therecommended torque.

Clearance

Type Hole Ø Hole Distances Edge Distances

d1 min A min B B+C

LHBM08 9/16" 1-3/8" 1/2" 11/16"

LHBM10 3/4" 1-9/16" 9/16" 7/8"

LHBM12 13/16" 2" 3/4" 1"

LHBM16 1-1/16" 2-3/16" 13/16" 1-5/16"

LHBM20 1-5/16" 2-3/4" 1" 1-5/16" A B C

d1 d1

min t

The tables above state the SWL with a 5:1 factor of safety and should be used for secondary applications.For primary design, please consult the guide Joints in Steel Construction - Simple Connections.

The guide provides design guidance for the use of Hollo-Bolt® and gives essential information for structural connections foruse in buildings designed by the ‘Simple Method’, i.e. braced frames where connections carry mainly shear or axial loadsonly.

To obtain further details on the Simple Connections guide, please contact:The Steel Construction InstituteTel: +44 (0) 1344 636 525Fax: +44 (0) 1344 636 570www.steel-sci.org

Published bySCI/BCSA Connections Group.Publication Number: P212ISBN 1 85942 072 9

Lindapter is a member of SCIand BCSA

Product Bolt Clamping Outer Sleeve Collar Torque Safe Working Loads2)

Code Length Thickness Ply1) Height Ø (5:1 Factor of Safety)W min t Length Outer Ø H D A/F Tensile Single Shear

L d ft lb lbs lbs

LHBM08 #1 2" 1/8" - 7/8" - 1-3/16"LHBM08 #2 2-3/4" 7/8" - 1-5/8" - 1-15/16" 9/16" 3/16" 7/8" 3/4" 17 899 1124LHBM08 #3 3-5/8" 1-5/8" - 2-3/8" - 2-11/16"LHBM10 #1 2-1/4" 1/8" - 7/8" - 1-3/16"LHBM10 #2 3" 7/8" - 1-5/8" - 1-7/8" 3/4" 1/4" 1-1/8" 15/16" 33 1910 2248LHBM10 #3 3-5/8" 1-5/8" - 2-3/8" - 2-5/8"LHBM12 #1 2-3/8" 1/8" - 1" - 1-3/8"LHBM12 #2 3-5/8" 1" - 1-13/16" - 2-1/4" 13/16" 1/4" 1-1/4" 1-3/16" 59 2360 3372LHBM12 #3 14-1/4" 1-13/16" - 2-3/4" - 3-1/8"LHBM16 #1 3" 5/16" - 1-1/8" 5/16" 1-5/8"LHBM16 #2 4" 1-1/8" - 2" 5/16" 2-1/2" 1-1/16" 5/16" 1-1/2" 1-3/8" 140 4720 6744LHBM16 #3 4-3/4" 2" - 2-13/16" 5/16" 3-5/16"LHBM20 #1 3-5/8" 5/16" - 1-5/16" 5/16" 1-15/16"LHBM20 #2 4-3/4" 1-5/16" - 2-3/8" 5/16" 3" 1-5/16" 3/8" 2" 1-13/16" 221 7868 8992LHBM20 #3 5-7/8" 2-3/8" - 3-3/8" 5/16" 4"