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 6685-01-646-5872
NSN 5950-00-208-6812
NSN 5835-01-325-5677
NSN 6220-01-259-2430
NSN 5960-01-254-3541
NSN 5950-01-513-2522
NSN 5945-01-463-9136
NSN 6105-01-587-8522
NSN 5835-01-485-0210
NSN 5915-00-112-3504
NSN 5855-01-400-1590
NSN 6645-01-467-9983