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 5835-01-364-6830
NSN 6685-00-202-3966
NSN 6620-01-435-7083
NSN 5905-01-646-1255
NSN 6650-00-170-5095
NSN 6110-00-763-4899
NSN 6685-01-578-2269
NSN 5960-00-055-8010
NSN 4140-01-411-6666
NSN 5990-00-530-3855
NSN 5920-01-074-6865
NSN 5996-00-821-5131