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 6110-01-144-5970
NSN 5999-01-406-4140
NSN 6220-00-001-6466
NSN 5996-01-227-1605
NSN 6620-01-050-2866
NSN 5998-00-969-9869
NSN 6105-01-251-9490
NSN 5945-01-306-0300
NSN 5835-00-518-4507
NSN 6620-00-948-6751
NSN 5835-01-116-2369
NSN 6110-01-026-1236