A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 6620-01-396-2149
NSN 6130-00-334-0691
NSN 4140-00-225-8586
NSN 6685-01-395-6961
NSN 5930-01-422-7883
NSN 6220-00-977-8839
NSN 5910-01-473-8068
NSN 6620-01-135-7846
NSN 5910-00-054-9548
NSN 5990-00-707-0731
NSN 5945-01-039-1454
NSN 6150-00-122-0648