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 6320-01-521-1764
NSN 6685-01-149-6494
NSN 5998-01-228-7633
NSN 6650-00-324-4973
NSN 6320-00-483-0451
NSN 5920-01-263-2781
NSN 4140-00-905-6570
NSN 6135-01-104-3790
NSN 2925-01-027-1293
NSN 6650-01-548-3495
NSN 5895-01-516-4721
NSN 2925-01-011-2325