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 5965-01-125-5367
NSN 5999-01-468-4539
NSN 6135-00-315-1187
NSN 5925-01-388-9679
NSN 7035-01-423-8343
NSN 5920-01-031-7360
NSN 4140-01-118-8918
NSN 6240-01-576-8356
NSN 5920-00-781-1928
NSN 6650-01-207-2905
NSN 6610-01-334-8883
NSN 5935-01-113-9391