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 6320-01-606-2508
NSN 5915-01-517-6528
NSN 5990-00-576-4882
NSN 5895-01-579-2452
NSN 5895-01-591-7942
NSN 5920-00-515-3617
NSN 5935-01-412-0240
NSN 6645-01-300-7611
NSN 5998-00-186-0201
NSN 5965-01-097-4867
NSN 5895-01-269-0724
NSN 5999-01-108-9714