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 5930-00-857-8809
NSN 7035-01-364-8454
NSN 5960-01-449-1310
NSN 6150-00-128-5992
NSN 5835-00-850-1475
NSN 5945-00-561-7868
NSN 5925-00-451-2061
NSN 5945-00-615-9218
NSN 2925-01-333-6346
NSN 5965-00-404-6809
NSN 5920-00-140-8912
NSN 5855-00-149-0766