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 6620-01-486-2555
NSN 6320-01-412-2973
NSN 2925-00-115-5857
NSN 6105-01-068-8143
NSN 6220-01-466-5084
NSN 6685-00-708-8162
NSN 5965-00-412-4402
NSN 5855-00-131-6338
NSN 6240-01-440-9827
NSN 6130-00-518-1884
NSN 6320-01-418-6681
NSN 5975-01-523-4600