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 6610-00-264-0961
NSN 6110-01-566-6850
NSN 6110-01-129-1409
NSN 5985-01-612-7141
NSN 6135-01-467-5100
NSN 5935-00-707-6148
NSN 6610-00-170-6715
NSN 5925-00-553-2274
NSN 5905-00-350-4105
NSN 5910-00-725-1091
NSN 6645-01-606-7684
NSN 6220-00-434-7364