A headed externally threaded fastener whose threaded portion is of one nominal diameter with a single rectangular or triangular projection on the underside of the head.
NSN 5915-01-317-3158
NSN 5998-01-250-5842
NSN 2925-01-032-3814
NSN 5945-01-462-1555
NSN 5985-01-012-1682
NSN 5975-00-125-2347
NSN 5915-00-992-3597
NSN 6150-00-862-1081
NSN 5915-01-158-5602
NSN 5965-00-990-8669
NSN 5996-01-371-6804
NSN 5945-00-244-1212