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 5925-00-889-0932
NSN 6620-00-726-4849
NSN 5905-01-008-5287
NSN 6240-01-281-7249
NSN 6650-01-297-4376
NSN 5950-01-630-3978
NSN 5996-00-192-3597
NSN 7035-01-344-8708
NSN 6650-01-384-6595
NSN 6220-00-880-1237
NSN 5915-01-380-0657
NSN 5985-00-327-4499