Through Bolts

Through Bolts have a tapered wedge and sleeve at the end of a length of thread. When tightened the sleeve expands to grip in the concrete. They are commonly used to fix handrails, park benches, shelters and other similar items into concrete.

Through Bolts work by expansion which makes them ideally suited for use in concrete. If you are fixing into softer materials such as bricks or blocks we would suggest the use of screw bolts, which are a stress free fixing.

The drill diameter required for the hole is the same as the bolt size - for example an M10x75 Through Bolt would require the use of a 10mm drill.

How to install a through bolt

To install a Through Bolt, drill the required size hole and blow out any dust. This can be done with a blow out pump or similar piece of equipment. Screw the nut into position just below the chamfered head and tap the anchor into the hole using a hammer. Tighten it to the recommended torque size.

A quick tip - if you don’t have a torque wrench to hand we suggest tightening the nut finger tight, then make a small mark on the top of the nut, noting the position of the mark for a guide.  Tighten the nut a further 3 to 4 full turns using a wrench to ensure that sufficient torque is applied.

It always advisable to check the nut a short while after installation, as it may creep slightly loose and require re-tightening.

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