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 6145-00-815-7154
NSN 5965-00-228-8336
NSN 5945-00-052-4831
NSN 5855-01-147-4785
NSN 5985-00-305-6214
NSN 6650-00-175-1342
NSN 5925-00-135-3440
NSN 5905-01-487-8647
NSN 5835-01-209-6410
NSN 5895-00-855-1083
NSN 6240-01-650-5348
NSN 5975-01-640-6894