5/16″-18 x 2-1/4″ Black Chrome Smooth Socket Cap Screws (3 pcs.)
Diameter: 5/16″ Length: 2-1/4″ Material: Steel Finish: Black Chrome Head Style: Smooth Socket (1/4″ Socket) Thread Size: 18 (Coarse) Type: Socket Cap Screw Box of 3. 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.