A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 2925-01-206-7948
NSN 5945-01-510-9223
NSN 7035-01-169-6551
NSN 6620-00-832-2556
NSN 5975-00-007-1925
NSN 7035-00-800-0770
NSN 5965-00-702-7257
NSN 5985-01-092-2029
NSN 5950-00-543-3447
NSN 6130-01-062-2244
NSN 5835-01-226-2337
NSN 5985-01-634-0635