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 5895-01-351-6551
NSN 5895-00-003-1558
NSN 6130-01-015-7413
NSN 6610-01-389-0620
NSN 5990-00-013-6862
NSN 5998-00-818-4797
NSN 6645-00-775-2172
NSN 5935-01-192-8948
NSN 5965-01-264-1738
NSN 5905-00-455-6816
NSN 5999-00-916-7992
NSN 6105-01-063-7704