Hillman 44018 Stainless Steel Button-Head Socket Cap Screws

A cap screw is threaded along the whole length of its shank and held by threads tapped in the hole in which it is screwed. These screws provide high-torque capability, and the drive system is a hexagon-shaped hole. Cap screws carry a recessed internal socket drive to add strength. They are commonly used on machine parts, manufacturing equipment, and other mechanical applications.