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 5935-01-605-1719
NSN 5960-01-429-5897
NSN 5915-01-367-2056
NSN 7035-01-019-5729
NSN 5910-00-242-2551
NSN 5999-01-225-5720
NSN 5915-00-223-5308
NSN 5975-01-146-4796
NSN 5855-01-527-9136
NSN 5990-01-351-4621
NSN 6320-01-522-0318
NSN 7035-00-529-3128