Shoulder Screw

A shoulder screw has a cylindrical shoulder that acts as a pivot or bearing surface, with a threaded end for fastening. It is used to locate parts and allow rotation or sliding.

A shoulder screw passes through a drilled hole and its unthreaded shoulder acts as a pivot or sliding surface. It often takes a nut of the same thread and class, and can be matched with a washer. A hex key or socket tool usually drives it.

This kind of screw is often made in stainless steel. Stainless steel gives good corrosion resistance for indoor and 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 and a mill test certificate for the material. On receipt, check the shoulder diameter, thread and head dimensions. Look for surface defects and confirm the grade marking.