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 5945-00-226-8560
NSN 6240-01-165-2693
NSN 5960-00-455-9218
NSN 5999-00-290-5898
NSN 5905-01-461-3144
NSN 5910-00-699-6391
NSN 6105-01-104-6942
NSN 5975-00-736-3420
NSN 6645-00-051-2875
NSN 6240-01-109-4680
NSN 6650-01-579-3855
NSN 6320-00-553-1310