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 5925-00-624-9568
NSN 5999-01-367-2223
NSN 5915-01-052-5916
NSN 6135-01-573-7164
NSN 5960-01-495-0859
NSN 6320-00-519-0770
NSN 5950-01-357-5583
NSN 5920-01-476-2448
NSN 6110-01-156-0388
NSN 6650-00-140-8776
NSN 2925-01-100-3694
NSN 5960-01-205-0386