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 5935-01-616-1920
NSN 5990-01-501-5409
NSN 6150-00-800-9875
NSN 6610-01-259-5296
NSN 5905-01-556-1949
NSN 4140-00-476-8683
NSN 5990-01-426-7350
NSN 6240-01-440-2561
NSN 6110-00-972-6005
NSN 6110-01-412-3990
NSN 5998-00-408-8846
NSN 5905-00-081-2738