Special Features:

Self locking element shall be 0.240 min and 0.266 max dia, 1.487 min and 1.503 max height above base of threads, 0.452 min and 0.516 max distance from end of fastener to the inner edge of the element, fastener shal; l be marked on the top surface of the head with a of 6 dots in a circle either raised or depressed

Properties:

An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. the threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. for items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.