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 5999-01-469-1883
NSN 5930-01-217-6877
NSN 5998-01-036-0630
NSN 6220-00-887-9372
NSN 5985-01-091-8100
NSN 6320-00-082-5868
NSN 5920-00-087-0274
NSN 5925-00-154-0372
NSN 5925-00-536-7651
NSN 5996-01-579-2986
NSN 4140-00-557-7001
NSN 5935-01-522-1289