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 6645-00-542-1734
NSN 5915-00-193-1440
NSN 6650-00-266-6808
NSN 5998-01-592-8704
NSN 6685-01-136-5670
NSN 7035-01-572-1045
NSN 2925-01-265-2853
NSN 6135-00-866-2311
NSN 5835-01-381-2683
NSN 5915-01-148-1891
NSN 5855-01-300-2301
NSN 5950-01-116-5641