Welcome

Welcome to our new website which has been carefully developed to assist you finding the solution to your connection requirement.

New features include the Girder Clamp Configurator, Hollo-Bolt Selector and BIM-compatible CAD files. As the website has been completely rebuilt, users of our old website will need to re-register to access these great features. We apologise for any inconvenience and hope you are pleased with the improvements this new website presents.

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Hollo-Bolt® FAQs

Can the Hollo-Bolt be used in concrete?

Can the Hollo-Bolt be used in all shapes and sizes of SHS?

Is it possible to reuse the Hollo-Bolt?

Why is there a minimum outer ply requirement when using M16 and M20 Hollo-Bolts?

Is it necessary to seal the Hollo-Bolt to prevent ingress of water?

How do I remove a Hollo-Bolt?

Can the maximum clamping thicknesses published in the catalogue be exceeded?

Which Hollo-Bolt load table should I use?

Can the Hollo-Bolt be used in concrete?

No. It is designed as an expansion bolt for SHS or other steel sections where access is available from one side only.

Can the Hollo-Bolt be used in all shapes and sizes of SHS?

Yes. It can be used in square, rectangular, circular, and other profiles where access is restricted to the outer face. In all cases the suitability of the component is subject to the available void space, the total thickness of the material to be clamped and in the case of circular sections, the radius of the outer face.

Is it possible to reuse the Hollo-Bolt?

No, although a new Hollo-Bolt can be inserted in the existing hole.

Why is there a minimum outer ply requirement when using M16 and M20 Hollo-Bolts?

To ensure the rubber washer does not compromise the shear capacity of the Hollo-Bolt by being within the shear plane.

Is it necessary to seal the Hollo-Bolt to prevent ingress of water?

Not always, especially on the size M16 and M20 Hollo-Bolt HCFs where the rubber washer expands to fill the void. Sealing washers are available; however, it is important the interface between the SHS face and plate or bracket is not ignored.

How do I remove a Hollo-Bolt?

Sizes M8, M10 and M12 using a pneumatic tool to remove the Hollo-Bolt:

1) Set the pneumatic hand tool to reverse mode (anti-clockwise rotation).

2) Place a suitable size spanner (depending on collar size) on the collar flats to hold in place.

3) Use the pneumatic hand tool to loosen the bolt.

4) Continue in reverse mode until the cone on the inside of the SHS at the other end of the bolt is released to drop inside the SHS.

5) The bolt can now be removed as can the sleeve by prying the collar with a pinch or crow bar.

Sizes M16 and M20 Hollo-Bolt HCF) using a pneumatic tool to remove the Hollo-Bolt: 

Steps 1) to 3) same as above.

4) Continue in reverse mode until the cone, expanded sleeve, and rubber washer on the inside of the SHS, at the other end of the bolt are released to drop inside the SHS.

5) The bolt and loose collar can now be removed.

Note: Hand tools can be used to untighten the bolt. These methods can also be used to remove the Hollo-Bolt Countersunk Head. The Hollo-Bolt Flush Fit however cannot be removed once it is installed.

Can the maximum clamping thicknesses published in the catalogue be exceeded?

No. The figures are accurate depictions and should not be exceeded under any circumstances.

Which Hollo-Bolt load table should I use?

For connections to secondary steelwork, please refer to page 42 of the Lindapter catalogue. If designing structural connections to Eurocode 3, see the Characteristic Values on page 43 of the Lindapter catalogue. For structural connections using the ‘Simple Method’ i.e. braced frames where connections carry mainly shear and axial loads only, refer to the BCSA and SCI design guide ‘Joints in Steel Construction – Simple Connections’.

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Faster to Install

No drilling or welding!

Independently Approved

Reasons to choose Lindapter

  • Save time and money

    Save time and money

    Clamping two steel sections together avoids time-consuming welding or conventional drilling and bolting.

  • Safer connections

    Safer connections

    On-site drilling and welding is avoided, removing the need for hot work permits and encouraging safer site conditions.

  • High strength

    High strength

    Lindapter clamps are manufactured from high strength materials to resist high load requirements and harsh environments.

  • Industry leading approvals

    Industry leading approvals

    Lindapter has earned a reputation synonymous with safety and reliability, gaining multiple independent approvals.

  • Adjustable

    Adjustable

    Quickly align steel sections by sliding the section into the correct position before tightening the Girder Clamp to complete the installation.

  • Free connection design

    Free connection design

    Lindapter’s experienced Engineers can design a bespoke connection based on your specific requirements free of charge.

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