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 5945-01-527-4857
NSN 5930-01-367-1857
NSN 6645-01-088-5244
NSN 7035-00-421-8710
NSN 6610-01-429-2162
NSN 6620-01-508-9702
NSN 6105-01-373-1932
NSN 4140-01-167-7574
NSN 5950-01-132-3338
NSN 6110-01-277-8631
NSN 5990-01-047-4083
NSN 6320-00-521-9350