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 4140-01-565-5580
NSN 6610-00-019-8433
NSN 6320-01-212-8749
NSN 5920-00-390-3437
NSN 6150-00-508-5096
NSN 5935-01-218-9158
NSN 6320-00-583-3104
NSN 4140-01-388-2007
NSN 5855-01-361-2362
NSN 5965-00-226-0209
NSN 5915-01-498-3512
NSN 6610-00-511-3328