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 5975-01-107-1758
NSN 6150-01-350-4072
NSN 5935-01-481-9168
NSN 6135-01-471-7325
NSN 6145-00-959-1481
NSN 6150-01-284-1052
NSN 5985-01-469-1329
NSN 5930-01-601-2296
NSN 5855-01-147-4785
NSN 6685-01-495-5653
NSN 6320-01-054-3046
NSN 5965-01-198-3256