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 6240-00-627-1071
NSN 5910-01-059-2483
NSN 5925-00-360-6785
NSN 4140-01-375-0782
NSN 6650-01-315-6609
NSN 4140-01-630-6991
NSN 5910-00-096-5160
NSN 6220-01-083-3092
NSN 5950-01-559-3299
NSN 5925-01-351-9405
NSN 6105-01-427-2336
NSN 6685-01-176-8623