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 5945-01-172-5754
NSN 5935-01-023-8282
NSN 5910-01-044-5886
NSN 2925-01-455-1270
NSN 5990-01-616-5242
NSN 5910-01-537-0532
NSN 5910-00-846-8099
NSN 7035-01-344-8708
NSN 6105-00-024-7856
NSN 6645-01-091-0009
NSN 6685-00-932-1322
NSN 6610-01-013-8922