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 6220-01-023-8818
NSN 5985-01-573-5144
NSN 6685-00-976-0890
NSN 6135-00-948-7061
NSN 6610-01-358-7582
NSN 6240-01-381-1072
NSN 5990-00-197-0159
NSN 6610-01-242-9674
NSN 6650-00-590-9073
NSN 5855-01-318-7663
NSN 5905-00-277-7439
NSN 5855-01-147-6024