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 5905-01-629-2075
NSN 5910-01-551-2537
NSN 5905-01-418-3868
NSN 4140-00-171-1387
NSN 6610-01-594-6999
NSN 6150-01-406-1815
NSN 6685-01-593-4511
NSN 5835-01-090-0784
NSN 2925-01-331-5039
NSN 5985-01-425-0775
NSN 5999-01-395-4948
NSN 6650-01-195-3957