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 5925-01-060-3002
NSN 5999-01-237-6638
NSN 5855-01-042-7990
NSN 5975-00-841-5857
NSN 5999-00-914-1774
NSN 6645-01-438-4118
NSN 6150-01-017-8353
NSN 6650-01-522-0075
NSN 5835-01-327-6324
NSN 6240-01-419-9597
NSN 5999-01-208-1765
NSN 6685-01-164-9050