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 5855-00-055-1579
NSN 6240-01-190-5344
NSN 5905-01-423-8857
NSN 5950-01-528-7143
NSN 6685-00-088-8285
NSN 5998-01-126-0433
NSN 5925-01-104-4893
NSN 5835-00-787-8122
NSN 5905-01-349-5429
NSN 6650-00-220-2839
NSN 5999-01-522-5505
NSN 5895-00-896-1877