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 6220-00-479-9171
NSN 6620-01-445-4295
NSN 5965-01-532-6779
NSN 6150-01-432-7529
NSN 6105-00-043-2566
NSN 5895-00-532-7081
NSN 5930-01-491-9893
NSN 6145-01-584-5405
NSN 6685-00-516-2173
NSN 2925-01-426-3410
NSN 5930-01-395-9111
NSN 7035-00-335-7283