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 6110-01-510-9585
NSN 5960-00-181-0640
NSN 5935-01-368-3084
NSN 5920-01-512-8101
NSN 2925-01-568-3705
NSN 5975-01-411-7724
NSN 5996-01-239-3928
NSN 6135-01-040-1446
NSN 6645-00-515-6148
NSN 5998-01-603-5283
NSN 5910-00-712-4066
NSN 5950-01-243-5652