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 5935-00-405-3058
NSN 6320-01-320-3305
NSN 5965-00-894-0015
NSN 5950-01-603-1584
NSN 5999-01-012-2449
NSN 5950-01-449-3502
NSN 5935-00-827-4019
NSN 5920-01-053-9797
NSN 5960-01-495-0859
NSN 6240-01-595-0803
NSN 5999-01-495-0468
NSN 4140-00-925-4149