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 6685-00-370-1612
NSN 5945-01-455-2645
NSN 6145-01-462-6972
NSN 5835-01-028-0097
NSN 6240-00-204-0459
NSN 5910-01-106-9016
NSN 2925-01-497-9381
NSN 5999-00-891-4420
NSN 5915-01-020-9805
NSN 6110-00-153-0936
NSN 5999-01-068-3639
NSN 5855-01-277-1663