Chamfered at the top; -- said of a hole.

Sunk into a chamfer; as, a countersunk bolt.

Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.

Refers to nails or screws that are driven below the surface in order to embed them in patching compound.

Most of our locks and accessories have countersunk fixing holes. This enables the fixing screws to be flush with the rest of the lock.

A fastener head that sits at or below the surface of the material such as a flat or oval head.