5/16"-18 x 3" Plain Steel Coarse Thread Socket Cap Screws (6 pcs.)
Head Style: Socket (1/4" Socket)
Thread Size: 18 (Coarse)
Type: Socket Cap Screw
Box of 6.
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.