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 5930-01-527-0369
NSN 7035-00-206-6123
NSN 5905-00-819-2821
NSN 5895-00-119-1291
NSN 5930-01-184-7554
NSN 6320-00-194-4252
NSN 5998-00-104-0554
NSN 6145-01-381-2529
NSN 6620-01-492-9508
NSN 6105-01-300-7594
NSN 6220-01-378-2072
NSN 5950-01-063-8291