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 6610-00-491-5867
NSN 6685-00-834-9187
NSN 5935-01-444-1320
NSN 6145-00-437-0025
NSN 6620-01-124-0947
NSN 6110-01-289-7666
NSN 5835-01-133-6485
NSN 4140-01-208-1851
NSN 6130-00-205-1714
NSN
NSN 5935-01-361-8008
NSN 6685-01-462-5361