Low Head Socket Cap Screw

A low head socket cap screw is a screw with a cylindrical head that is shorter than a standard socket head. It is tightened with a hex key and is used where head height is limited.

A low head socket cap screw fastens parts where head clearance is tight. It sits in a counterbored hole and is driven with a hex key. It takes a nut or a tapped hole of the same thread and class.

Black oxide gives a dark finish and mild corrosion protection for indoor use. It can also help with lubricity during tightening.

This kind of screw is often made in stainless steel 304. Stainless steel 304 suits general use and gives good corrosion resistance. Steel grades are also common and can be finished with black oxide.

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 for the material, dimensions and grade. On receipt, check the socket for damage, the thread for burrs, and the head for cracks. Confirm the thread size and length match your order.