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 6130-00-288-1886
NSN 5975-00-870-6323
NSN 5985-00-083-6889
NSN 6110-01-024-5270
NSN 5945-01-328-7531
NSN 6110-01-583-8032
NSN 6110-00-307-2643
NSN 5835-00-992-0087
NSN 5905-00-666-4983
NSN 5975-00-403-4983
NSN 6620-00-147-6034
NSN 6145-01-278-6182