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 5990-01-425-2175
NSN 5915-01-062-2103
NSN 5999-01-474-8448
NSN 5915-01-463-2465
NSN 5835-01-338-5176
NSN 5950-00-125-5142
NSN 4140-01-322-5182
NSN 5950-01-370-5979
NSN 5945-00-887-0108
NSN 5930-01-432-2699
NSN 5945-01-019-4945
NSN 5935-01-549-0381