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 6135-00-221-4720
NSN 6145-01-020-1787
NSN 6220-01-273-0177
NSN 6110-00-248-7475
NSN 5975-01-023-1777
NSN 6220-01-095-4860
NSN 6145-00-500-5679
NSN 5996-01-183-1205
NSN 5835-01-478-0157
NSN 6130-00-095-6501
NSN 6620-00-411-4983
NSN 5996-01-425-7097