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 5915-00-130-1796
NSN 6220-01-268-8795
NSN 5895-01-101-5153
NSN 6685-01-106-6565
NSN 5975-01-613-7922
NSN 5999-01-533-2548
NSN 5855-00-763-2155
NSN 6150-00-195-1827
NSN 5985-01-426-5198
NSN 5855-01-464-3152
NSN 5920-01-494-5602
NSN 5990-01-476-0722