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 5915-01-193-3213
NSN 6320-01-576-6310
NSN 5930-01-126-4046
NSN 5935-01-562-0517
NSN 5960-01-245-3942
NSN 6110-00-676-1599
NSN 5998-01-430-4653
NSN 6130-01-252-8351
NSN 5855-01-344-8688
NSN 5985-01-030-9995
NSN 6110-01-535-7162
NSN 2925-01-446-6976