US Patent 6941758 Internally coolable screw

A screw includes a head and a shank, and includes a coolant passage which has an inflow opening and an outflow opening. The cooling pasage does not pass axially through the entire head and shank. By avoiding a coolant flow which passes axially through the entire screw, especially effective utilization of a coolant is achieved, in particular by coolant which also flows on the outer surface of the screw.