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 5975-01-625-5119
NSN 6320-01-160-7757
NSN 6135-01-482-7901
NSN 5996-01-506-7585
NSN 4140-01-182-4830
NSN 5975-00-293-3995
NSN 5998-00-739-8930
NSN 6145-01-252-7675
NSN 6135-01-231-4809
NSN 6145-00-078-9917
NSN 5925-01-630-9832
NSN 6240-00-078-2360