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 6240-01-426-5581
NSN 6645-01-518-4296
NSN 2925-01-419-3805
NSN 6620-01-352-5640
NSN 6220-00-283-5050
NSN 6150-01-323-0007
NSN 6150-01-124-8039
NSN 6650-01-050-2907
NSN 6110-01-310-4986
NSN 5960-01-431-4291
NSN 6650-01-332-3799
NSN 6130-01-462-0634