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 5999-00-313-3341
NSN 5915-01-104-4977
NSN 5950-01-338-9496
NSN 5996-01-434-7417
NSN 7035-01-256-9598
NSN 5998-01-356-9230
NSN 5925-01-081-0436
NSN 6650-00-292-9106
NSN 5998-01-200-8486
NSN 5975-01-629-6838
NSN 6240-00-908-5069
NSN 6240-01-426-5581