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 5935-01-133-6642
NSN 5935-01-634-0668
NSN 6130-01-239-1445
NSN 4140-01-375-9921
NSN 7035-01-242-4913
NSN 6130-01-461-2954
NSN 5915-01-054-2050
NSN 5910-00-453-3401
NSN 5999-00-973-6309
NSN 2925-00-157-1602
NSN 5998-01-080-3692
NSN 5975-01-450-8534