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 6110-01-363-0497
NSN 5965-01-415-6351
NSN 6240-00-269-9477
NSN 2925-00-827-2326
NSN 6150-01-363-8650
NSN 6320-01-541-7585
NSN 5990-01-364-1942
NSN 6145-01-037-7602
NSN 5975-00-952-1791
NSN 6130-01-601-7988
NSN 6240-01-160-7388
NSN 5935-01-257-6965