5/16"-18 x 2-1/4" Chrome Grade 8 Knurled Socket Cap Screws (8 pcs.)Type: Chrome Knurled Head Socket Cap Screws
Head Style: Knurled Socket (1/4" Socket)
Thread Size: 18 (Coarse)
Hardness: Grade 8
Type: Socket Cap Screw
Box of 8.
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.