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 6645-00-602-5968
NSN 5998-01-552-9824
NSN 6150-01-547-2225
NSN 5965-00-052-7596
NSN 2925-01-492-5342
NSN 5985-01-285-0589
NSN 6610-01-112-0447
NSN 7035-01-388-6943
NSN 6240-01-250-3574
NSN 6685-01-461-4057
NSN 6610-01-083-1446
NSN 5915-00-186-0463