5/16"-18 x 2-1/2" Plain Socket Cap Screws SCSS-258 (7 pcs.)
Head Style: Socket (1/4" Socket)
Thread Size: 18 (Coarse)
Type: Socket Cap Screw
Box of 7.
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.