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 6610-01-114-7815
NSN 6610-00-548-3452
NSN 5930-01-603-2260
NSN 5905-00-848-1847
NSN 6620-00-060-6801
NSN 6650-00-989-1103
NSN 6650-01-250-5164
NSN 6220-01-274-7788
NSN 5895-00-188-8156
NSN 5985-00-584-3795
NSN 6320-01-054-3046
NSN 5990-01-174-6851