Coach or cup head bolts are traditionally a timber fastening.  They have a smooth dome head – this makes them suitable to use in floors, steps or high traffic areas where a smooth finish is critical, or in outdoor furniture, raised garden beds, timber gates and fences. The square under head is designed to ‘lock’ the bolt in place in a round hole to enable tightening  with a nut and washer.
Available in full thread or part thread.  Part thread has the advantage when used in a
timber application for creating a superior seal between the timber and the plain shank of the screw, reducing the ingress of moisture.

Stocked sizes:  1/4" - 3/8" UNC.