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 5925-01-475-0976
NSN 5950-00-167-7650
NSN 5965-00-958-7455
NSN 6135-01-017-3001
NSN 4140-01-529-6811
NSN 5999-01-362-6771
NSN 5996-01-569-4799
NSN 5990-01-199-2846
NSN 6110-01-477-2111
NSN 5935-01-133-5888
NSN 6320-01-578-6006
NSN 2925-00-816-8765