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 5920-01-534-3806
NSN 5999-01-181-5469
NSN 6240-00-120-0140
NSN 5985-00-734-7479
NSN 6110-00-100-4775
NSN 6145-01-220-2309
NSN 5920-00-727-5862
NSN 6110-01-577-7661
NSN 5930-00-127-9959
NSN 5999-00-258-4033
NSN 6110-01-566-3973
NSN 5835-01-604-7489