Socket screws have a machine screw thread and are made primarily in two materials, steel and stainless steel. The steel socket screws are made from an alloy steel and are heat treated to high tensile strengths. The stainless steel socket screws are generally made from 302 or 304 and are not heat treated.
Precision Cross Recess Head Shoulder Screws
Precision Slotted Head Shoulder Screws
Precision Socket Head Shoulder Screws