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:
**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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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 structural tube section. The table below gives guidelines for:
The diagram above illustrates these dimensions.
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