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 6610-01-027-1641
NSN 2925-00-829-9082
NSN 6130-01-437-3068
NSN 5920-01-129-1473
NSN 5895-00-229-7167
NSN 5950-00-683-8304
NSN 6110-01-410-7637
NSN 6110-01-363-6914
NSN 5905-01-029-9107
NSN 5960-01-622-0393
NSN 5985-01-424-7821
NSN 5996-01-054-2820