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 5910-01-388-6905
NSN 6220-00-451-7065
NSN 6240-01-224-6941
NSN 6220-01-254-9246
NSN 5910-01-236-4969
NSN 6620-01-483-1138
NSN 5996-00-372-4528
NSN 5895-01-476-7806
NSN 5996-00-484-6347
NSN 6320-00-242-3300
NSN 5996-00-081-2564
NSN 6150-01-358-1464