« Back
Eureka Fastener Finder
Find the ideal fastener or fixer for your application!

Cup Square and Nut

A cup square is a domed head bolt with a square anti-spin shoulder. Cup squares are mainly used to attach wood to wood, for example, the seat and back slats of garden benches to the support structure.

The fastener is designed so that the square shoulder pulls into the wood as the nut on the other end is tightened, thus eliminating the need for a second spanner to prevent the bolt from turning while the nut is tightened.

The domed head of the bolt will also make the finished product look and feel more attractive and thanks to the rust resistant galvanised coating, the cup square can be used for exterior applications.

Available sizing:
 6 x 40mm     
 6 x 50mm     
 6 x 65mm     
10 x 90mm     
10 x 120mm