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 5960-01-411-5899
NSN 5920-00-438-4973
NSN 5920-00-655-4251
NSN 6220-01-408-3017
NSN 4140-01-136-2204
NSN 6110-00-549-6662
NSN 5998-01-543-0013
NSN 5996-00-111-5537
NSN 5895-00-075-5551
NSN 6110-00-026-8262
NSN 5996-01-350-3345
NSN 5998-01-503-0427