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 6620-01-573-1952
NSN 5950-00-226-9320
NSN 5965-00-510-4301
NSN 5990-01-430-9177
NSN 6110-01-417-6108
NSN 6105-00-588-4686
NSN 5905-00-376-5220
NSN 6135-00-182-7008
NSN 5935-01-633-7948
NSN 6110-01-206-3733
NSN 6620-01-243-5281
NSN 5999-00-134-7014