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 5965-01-653-4490
NSN 5945-01-078-8629
NSN 5855-01-657-7657
NSN 6685-01-546-3620
NSN 5915-01-546-7335
NSN 6110-01-192-3786
NSN 5996-00-151-4462
NSN 5996-01-630-8108
NSN 7035-01-241-2127
NSN 6650-01-421-0643
NSN 5985-01-460-9295
NSN 6320-01-143-3597