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 6610-01-502-5952
NSN 5990-00-033-8128
NSN 6110-01-658-7426
NSN 6685-01-580-0311
NSN 2925-00-795-4063
NSN 5930-00-295-3859
NSN 4140-00-446-1024
NSN 6610-01-178-0333
NSN 5945-01-527-0936
NSN 6220-00-734-8874
NSN 6685-00-103-2854
NSN 5925-01-229-7536