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 6135-00-990-1822
NSN 4140-00-294-3654
NSN 5855-00-407-2801
NSN 5935-01-099-1662
NSN 5960-01-203-9814
NSN 6135-00-405-1989
NSN 6110-01-048-7725
NSN 5998-00-917-1393
NSN 6610-01-129-1053
NSN 6240-00-368-8541
NSN 6240-01-204-0046
NSN 6645-00-664-4665