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 5975-00-171-1344
NSN 5975-01-139-6797
NSN 5915-01-321-1892
NSN 6110-01-063-8309
NSN 6685-00-400-8389
NSN 6110-01-436-3810
NSN 5975-01-581-8127
NSN 6110-01-386-4055
NSN 4140-01-005-0154
NSN 6320-01-021-6633
NSN 5975-01-536-9904
NSN 5835-01-383-1313