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 5960-01-444-2205
NSN 2925-00-912-3993
NSN 5930-01-506-4518
NSN 5999-01-395-6411
NSN 5990-01-625-5923
NSN 6610-01-010-4516
NSN 6145-01-037-9291
NSN 5998-00-622-4648
NSN 5835-00-061-5717
NSN 6105-01-244-0197
NSN 6130-01-064-2874
NSN 5920-00-997-0157