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BoxBolt

BoxBolt expansion bolt

An expansion bolt connecting steel structural sections

BoxBolt is a fully tested and approved blind fixing solution for connecting to hollow section steelwork or where access is restricted to one side only. The fixing is suitable for use with rectangular, square and even circular hollow sections. BoxBolt features a design that aids installation with a standard spanner but also allows it to be installed with our unique BoxSok installation tool for when installation time needs to be kept to an absolute minimum.

BoxBolt® is a steel connection used to bolt 2 steel beams together (or other steel structures), when access is restricted to one side. It is an easy to install and safe solution.

Go to BoxBolt® technical specifications


Our fixing is available in three finishes; Zinc Plated for the less aggressive environments, Hot Dip Galvanised for the more aggressive environments and Stainless Steel for the most arduous of applications. These finishes, combined with three lengths of BoxBolt, make it extremely flexible to suit its environment and application.

If you're looking for quality box bolts or hollow bolts for steel, then look no further. BoxBolt Is a reliable and sturdy option that you can trust for your next construction project. With BoxBolt, you can be confident that you're using a fully approved and tested blind fixing solution that will do the job correctly the first time.

Simplify steel connections


These expanding bolts for steel are easy to install from one side of your connection, eliminating the need for rear access.

CE marked


BoxBolt is a CE marked product and it is approved for use by Lloyds Register (LR) type approval and the Deutsches Institut fur Bautechnik (DIBt).

Safe solution


Unlike a welded solution, this hollow bolt allows you to know exactly what your safe working loads are with a 5:1 safety factor.

Save time on installation


No need for a hot weld permit and only requires you to drill one hole in your structure.

See how BoxBolt works

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A faster way with BoxSok

To tighten down a BoxBolt, an installer must typically use 2 wrenches to install one bolt - one to hold the outer sleeve stationary, and one to turn the inner bolt.

The BoxSok adds simplicity to the installation process. Attached to a regular socket wrench (air powered makes this a snap), it takes the place of both wrenches. The BoxSok has an outer piece that will hold the sleeve of the BoxBolt stationary, while an inner piece turns the bolt. This makes what would have been a 4 minute job (per bolt) into a 30 second job.


Learn more about BoxSok

Installation examples

Case study

Case study: BoxBolt expansion bolt used for commuter train line

See how BoxBolt expansion bolts are used to fix a 5 mile guardrail along the train racks.

Some specification considerations

Clamping range

The clamping range of the BoxBolt connector is the combined thickness of the steel being connected and the steelwork being connected to. Each diameter of the BoxBolt connector has three overlapping lengths designed to accommodate a wide range of material thicknesses. If your clamping range exceeds those stated above, special lengths are available.


Hole dimensions and positioning

The clamping range of the BoxBolt connector is the combined thickness of the steel being connected and the steelwork being connected to. Each diameter of the BoxBolt connector has three overlapping lengths designed to accommodate a wide range of material thicknesses. If your clamping range exceeds those stated above, special lengths are available.

Technical data

Download the following data sheet for dimensional and load information

Full BoxBolt catalogue
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