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 5998-01-555-8489
NSN 6135-00-935-5241
NSN 5950-01-060-1251
NSN 5895-00-916-6338
NSN 5835-01-094-2662
NSN 5975-00-023-1937
NSN 5950-01-631-6279
NSN 5990-01-411-8548
NSN 2925-00-875-5116
NSN 5985-01-289-4241
NSN 5998-01-612-6038
NSN 5835-00-957-3565