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 5960-00-306-4177
NSN 5835-01-432-1277
NSN 5905-00-601-2391
NSN 7035-00-884-8366
NSN 5835-01-606-8768
NSN 6110-00-042-0978
NSN 5990-01-606-1873
NSN 4140-01-551-1125
NSN 5998-01-441-5806
NSN 5999-01-025-9377
NSN 6650-00-605-4058
NSN 5990-01-311-7491