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 6610-00-150-7002
NSN 5935-00-101-7818
NSN 6105-00-008-0214
NSN 5925-01-625-8942
NSN 5950-01-403-2852
NSN 5996-00-814-5309
NSN 5945-01-189-1476
NSN 6130-01-201-9302
NSN 6105-01-634-0322
NSN 6320-00-937-5625
NSN 5998-01-537-8720
NSN 5999-01-475-4021