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 6110-00-061-9239
NSN 5960-01-052-9577
NSN 6130-01-474-8638
NSN 5915-00-926-2471
NSN 5925-01-193-7428
NSN 5985-01-075-4699
NSN 5835-01-213-0833
NSN 6145-00-699-8963
NSN 5985-01-552-7217
NSN 5965-01-447-2992
NSN 4140-01-463-6377
NSN 5925-01-098-3019