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 6150-00-915-8448
NSN 5996-01-420-8231
NSN 5985-00-781-5397
NSN 6130-01-064-7351
NSN 5990-00-104-1617
NSN 5930-00-293-2492
NSN 5835-01-186-4961
NSN 5945-00-707-3384
NSN 5935-00-178-8090
NSN 5835-01-497-5029
NSN 5920-00-711-1741
NSN 5920-00-196-3631