Coach Screw

A coach screw is a heavy wood screw with a hexagonal head and a coarse thread. It pulls timber together and holds it to a base material.

A coach screw drives into timber and clamps it to another timber member or to a metal bracket. It has a hexagonal head and a coarse thread that bites into wood without a nut. It is matched to a pilot hole and driven with a spanner or socket.

Coach screws are often made in steel. The steel can be left plain or given a coating for outdoor use.

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

Ask for a certificate of conformance with the batch. Check the head marking, thread form and that the screws are free from cracks or burrs on receipt.