Tension Control Bolt

A tension control bolt is a high strength structural bolt with a splined end and a matching nut. It is tightened with a special wrench that shears the spline at the set tension.

A tension control bolt tightens a structural joint by shearing its splined end with a special wrench. It usually pairs with a matching nut and washer in a bolted assembly. The wrench stops when the splined end breaks off, which shows the bolt has reached its tension.

Plain finish is bare steel and suits dry indoor conditions. Zinc plating gives mild corrosion protection for general outdoor use.

This kind of bolt is usually made in high strength alloy steel. The grade affects the tension it can hold.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a mill test certificate and check the bolt, nut and washer markings on receipt. Confirm the dimensions and grade against the order.