A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 4140-01-392-2107
NSN 5930-01-600-3458
NSN 5975-00-056-8600
NSN 6135-01-026-9960
NSN 5855-01-646-1585
NSN 2925-01-121-0761
NSN 6685-00-198-9506
NSN 5975-00-547-8911
NSN 6105-01-526-1961
NSN 6685-00-203-2389
NSN 6130-01-579-2183
NSN 5945-00-243-8113