Back Home / Fasteners / Socket Products / CUP-POINT SOCKET SET-SCREW 5/16″-18 X 3/8″ CUP-POINT SOCKET SET-SCREW 5/16″-18 X 3/8″ SKU: 561838CPS Categories: Fasteners, Socket Products A headless screw threaded the entire length. It has a hex drive at one end and a cup-shaped indentation at the other end. The cup point is the most used style set screw. Rockwell hardness of C45-53. Diameter: 5/16-18″ Length: 3/8″ Case Quantity: 100 Log In For Pricing