The Lindapter Hollo-Bolt is a patented method of securing to square, rectangular or circular hollow section steel, or to conventional steelwork where access is available from one side only.

Awarded the Design Council's Millennium Products status for innovation in connecting to hollow section, the
Hollo-Bolt also has third party endorsements from Corus and the UK's Steel Construction Institute.

The Hollo-Bolt offers a tremendous reduction in installation time and costs over traditional methods,as well as giving the specifier absolute confidence through guaranteed loads with a built in factor of safety.
For aggressive environments, the Hollo-Bolt comes with JS500 protection as standard and is available in stainless steel if the application demands.

M16 and M20 sizes feature a collapse mechanism to maximize clamping force
and enable us to use as a primary moment connection.

Typical Hollo-Bolt applications include the connection or suspension of:

        

Standard Hollo-Bolt
Note: Only Length #1 shown in the table, contact Lindapter for other available lengths.

Table for Type HB

Bolt Size Metric (US Equiv)	Product Code	Setscrew Length Metric (US Equiv)	Combined Material Thickness (W)		Across Flats Main Body	Tightening Torque (ft lb)	Shank Diam. (A)	Hole Size (Z)	Structural Tube	Safe Working Load* (5:1 Factor of Safety)
			Min	Max						Tensile (lb)	Shear (lbs)
M8 (5/16")	LHBM08	50 mm (2")	1/8"	7/8"	3/4"	16	9/16"	9/16"	5" x 5" x 3/16", 1/4", 5/16"	899	1124
M10 (3/8")	LHBM10	55 mm (2-3/16")	1/8"	7/8"	15/16"	30	3/4"	3/4"	5" x 5" x 3/16"	1348	2248
M12 (1/2")	LHBM12	60 mm (2-3/8")	1/8"	1"	1-3/16"	59	13/16"	13/16"	5" x 5" x 3/16"	1461	3372
M16 (5/8")	LHBM16	75 mm (3")	5/16" **	1-1/8"	1-3/8"	140	1-1/16"	1-1/8"	5" x 5" x 3/16"	1798	6744
M20 (3/4")	LHBM20	90 mm (3-9/16")	5/16" **	1-5/16"	1-13/16"	221	1-5/16"	1-3/8"	5" x 5" x 1/4"	3597	8992
**While the minimum fixing thickness for M16/M20 is 5/16", it is important that the outer ply is at least 5/16" to maximize shear capabilities. Where the outer ply is below 5/16" thickness, spacer washers should be used beneath the collar to increase to 8mm. ***For further structural tube details not listed, please contact our technical department. The tensile safe working load for the Hollo-Bolt is dependent upon the strength of the structural tube, particularly with thin wall sections. The highest tensile figure given for each bolt size is the safe working load of the Hollo-Bolt itself. Any lower figures against a particular size show that the mode of failure in that case was the structural tube section, rather than the Hollo-Bolt.

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Stainless Steel Hollo-Bolt

To obtain further details on the Simple Connections guide please contact The Steel
Construction Institute on Tel: +44 (0) 1344 623 345 or Fax: +44 (0) 1344 622 944
Published by SCI/BCSA Connections Group.
Publication Number: P212 ISBN 1 85942 072 9

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Perhaps Hollo-Bolt's greatest advantage is the ease with which the product can be installed.
Detailed below are the three simple installation stages:

Step 1
Drill holes in required position (see hole preparation table below for recommended hole size). Offer up the Hollo-Bolt and fixture to the steelwork (the example pictured on the right shows steel angle). Insert product through both fixture and steelwork, cone end first.

Hole Preparation 

Some care must be taken both in preparation of the drilled hole for the product and in the location of the hole with regard to the hollow section steel. The table below gives guidelines on minimum distance between hole centres for neighbouring Hollo-Bolts (X), minimum distance of hole centre from inside wall of hollow section steel (Y) and drill size to be used (Z). The diagram below illustrates these dimensions. Click Here for Hollo-Bolt Application Diagrams.

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