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 6620-01-142-6216
NSN 5975-01-295-9198
NSN 6105-01-111-4344
NSN 6620-01-070-2215
NSN 4140-01-428-8785
NSN 5996-00-176-0999
NSN 5835-01-176-5422
NSN 5999-01-034-0716
NSN 6150-01-350-4463
NSN 5920-01-364-9528
NSN 6135-00-753-2276
NSN 4140-00-938-2011