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 6150-01-433-2107
NSN 6610-01-387-7517
NSN 5999-00-202-0788
NSN 6610-01-375-1527
NSN 6650-01-517-9452
NSN 6645-01-573-2536
NSN 5915-01-416-1528
NSN 6150-01-410-8215
NSN 5895-01-112-5621
NSN 5920-01-111-1214
NSN 5895-01-604-9279
NSN 6620-01-481-1358