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 5950-01-634-0677
NSN 5975-00-518-1733
NSN 5910-01-067-8361
NSN 6645-01-519-2732
NSN 5930-01-422-4262
NSN 6685-01-446-9594
NSN 5935-01-261-3110
NSN 4140-01-333-7876
NSN 6145-00-845-1966
NSN 5930-01-465-1737
NSN 6320-01-265-0665
NSN 5975-01-298-6848