Special Features:

Undercut beneath bearing surface of head diameter 0.475 inches, width 0.031 inches, at a distance of 1.724 inches from bearing surface item is grooved 0.219 inches wide by 0.031 to 0.036 inches in depth, between these two points the diameter has been machined to a diameter of 0.490 to 0.495 inches

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.