Hex-head bolt
A hex-head bolt is an externally threaded fastener with a hexagonal head for tool-applied torque, used with either a nut or a tapped hole. Its head, threaded length, shank and engagement distinguish it from a fully threaded stud. Diameter, pitch, length, grade, finish and the nut-and-washer assembly must follow the joint design.
Application and duty
Bolted joints requiring a hexagonal head and thread engagement defined by the design