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 7035-00-908-4933
NSN 5920-01-446-4524
NSN 5910-01-072-5758
NSN 6105-01-528-6793
NSN 6150-00-766-8560
NSN 6320-01-399-6177
NSN 5835-00-954-1190
NSN 6610-01-499-6276
NSN 5925-01-298-3422
NSN 5945-01-347-0531
NSN 5998-00-741-2321
NSN 5855-01-241-1054