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 5998-00-283-1129
NSN 6110-01-179-7024
NSN 5965-01-495-1170
NSN 5855-01-278-8922
NSN 6220-01-103-3059
NSN 5975-01-571-7912
NSN 5925-01-198-9910
NSN 5855-01-259-0151
NSN 5998-00-328-8945
NSN 5895-00-287-6375
NSN 5895-00-514-0616
NSN 6240-01-340-6265