A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 6650-01-545-4037
NSN 6145-00-054-7797
NSN 5998-01-622-0466
NSN 5855-01-337-0245
NSN 5925-01-660-6739
NSN 6240-01-051-2557
NSN 5998-01-538-2785
NSN 5975-01-323-9909
NSN 5835-01-350-0566
NSN 2925-00-574-3883
NSN 5920-00-861-6091
NSN 5895-01-591-9793