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 5935-01-528-6721
NSN 6145-00-330-7581
NSN 6685-01-221-0209
NSN 5950-00-419-0172
NSN 6110-01-225-4481
NSN 5998-01-162-9439
NSN 5910-01-519-2308
NSN 5910-00-755-9058
NSN 6105-00-200-7391
NSN 6105-01-460-5496
NSN 5999-00-145-7783
NSN 5999-00-923-8966