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 5920-01-191-9847
NSN 5920-00-411-5237
NSN 6130-01-104-9973
NSN 7035-01-227-2546
NSN 6150-00-644-0029
NSN 6130-01-441-2618
NSN 5895-01-338-7717
NSN 5998-01-484-9892
NSN 5915-01-429-3077
NSN 5998-01-344-6201
NSN 5950-01-472-3870
NSN 6130-00-900-4758