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 6650-01-061-2750
NSN 6145-00-729-3702
NSN 5835-00-256-5558
NSN 6150-01-435-6554
NSN 5975-01-410-9891
NSN 5935-01-536-1556
NSN 6645-01-563-9514
NSN 5998-01-315-9212
NSN 5990-01-229-3003
NSN 5960-01-583-3127
NSN 5945-01-039-1454
NSN 5920-01-163-2491