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 5915-01-576-8602
NSN 6220-01-021-0181
NSN 5935-01-534-9996
NSN 6650-01-052-8522
NSN 4140-00-376-5712
NSN 5910-01-423-7711
NSN 5950-01-537-1110
NSN 6105-01-523-3733
NSN 2925-01-094-4771
NSN 6145-01-587-4677
NSN 5990-01-448-2751
NSN 5920-01-643-5512