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 5945-00-173-2936
NSN 5835-00-440-9066
NSN 2925-01-358-8346
NSN 5935-01-128-4592
NSN 4140-00-871-9619
NSN 6150-00-461-5939
NSN 6320-01-215-1133
NSN 5975-01-152-9353
NSN 5930-00-402-1628
NSN 7035-01-196-3445
NSN 5985-00-952-5711
NSN 6220-01-594-8773