M3-0.50 Socket Head Cap Screw, Plain Stainless Steel, 6 mm Length, 15 PK, Midwest Fastener, Mfr#: 77021

A socket cap screw is a type of cap screw with a hexagonal recessed drive. A hex key is required to tighten or loosen a socket screw. Socket screws are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket.