Countersink in top of head
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.
NSN 6135-01-449-2144
NSN 5998-01-446-1954
NSN 6220-01-446-3269
NSN 6105-00-908-1664
NSN 5930-01-242-4415
NSN 5905-01-347-8892
NSN 6105-01-078-1783
NSN 6685-00-342-9408
NSN 6645-01-294-6403
NSN 5950-00-764-7567
NSN 6145-01-428-7754
NSN 5835-01-155-0786