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 5905-00-911-3469
NSN 6220-00-541-8515
NSN 6135-00-182-7008
NSN 6105-00-546-2110
NSN 6610-01-524-0636
NSN 5905-00-517-8731
NSN 5835-01-606-8768
NSN 6685-00-981-2113
NSN 5835-00-729-9305
NSN 5920-00-725-1804
NSN 5905-01-197-0217
NSN 6220-01-338-2062