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 5930-00-623-0416
NSN 5920-00-728-3005
NSN 5985-01-304-8855
NSN 7035-01-656-8917
NSN 5960-00-496-9500
NSN 5835-01-442-6482
NSN 4140-01-227-4674
NSN 5998-01-077-0662
NSN 6320-01-119-3935
NSN 5975-01-607-0087
NSN 6130-00-518-1723
NSN 5910-00-874-1048