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 6220-00-271-9553
NSN 6240-01-493-8365
NSN 5999-00-279-2020
NSN 6685-01-226-2791
NSN 2925-00-115-5857
NSN 6130-01-463-2249
NSN 5960-01-163-3847
NSN 4140-01-511-6039
NSN 6620-00-113-5900
NSN 5998-00-280-7270
NSN 5975-01-134-6652
NSN 6240-01-513-5435