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 6135-00-078-9931
NSN 5915-01-562-1664
NSN 6145-00-248-4944
NSN 6240-01-608-4401
NSN 6650-01-441-7790
NSN 5960-01-622-0393
NSN 6320-01-170-4068
NSN 5930-01-494-9187
NSN 2925-01-556-0333
NSN 5910-01-409-9230
NSN 2925-01-459-8093
NSN 5835-01-191-3405