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 6110-00-146-2114
NSN 5835-01-055-6063
NSN 5985-01-479-2623
NSN 4140-01-198-9990
NSN 6240-00-768-9861
NSN 5999-01-411-4352
NSN 5930-01-285-5770
NSN 5996-00-086-9352
NSN 6685-01-391-9546
NSN 5835-01-328-6626
NSN 6105-01-508-7921
NSN 5950-01-612-6197