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 5935-00-405-5385
NSN 5935-01-239-4272
NSN 5935-00-534-8502
NSN 5975-01-173-9592
NSN 6620-00-723-2075
NSN 5960-01-383-6262
NSN 5985-01-317-6633
NSN 6645-00-445-8143
NSN 6145-00-445-7839
NSN 6240-00-960-8458
NSN 5905-00-141-1442
NSN 6645-01-033-0150