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 6130-01-179-8480
NSN 5996-00-623-6651
NSN 6620-01-544-4857
NSN 5975-00-189-0093
NSN 5985-01-601-9178
NSN 5925-01-483-2007
NSN 6240-01-645-4797
NSN 5996-01-164-8266
NSN 5945-00-316-0924
NSN 5960-00-962-5391
NSN 5999-00-481-5610
NSN 6240-01-534-5829