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 5925-01-521-3915
NSN 5935-01-207-0637
NSN 5945-01-504-6254
NSN 6135-00-209-6918
NSN 6240-01-007-7987
NSN 2925-01-055-9705
NSN 6650-01-555-8819
NSN 4140-01-364-9797
NSN 6620-00-346-7591
NSN 5985-01-571-7959
NSN 6220-00-682-4848
NSN 7035-01-042-5308