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 5835-01-647-6426
NSN 5835-01-578-3443
NSN 5990-01-352-5255
NSN 6135-00-777-5562
NSN 5935-01-289-6336
NSN 6645-01-475-4723
NSN 6650-01-563-5287
NSN 6135-00-276-7625
NSN 5835-00-969-1920
NSN 5985-00-648-2081
NSN 6130-00-411-1636
NSN 5960-00-215-5884