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 6645-00-279-1777
NSN 5930-01-387-3036
NSN 6320-01-454-1965
NSN 5999-01-222-7095
NSN 5835-01-111-9838
NSN 5960-01-298-2609
NSN 7035-01-213-5590
NSN 5910-01-556-8008
NSN 6650-00-866-9947
NSN 5905-00-434-1728
NSN 6150-01-643-5394
NSN 5925-00-813-6810