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 5945-00-613-9056
NSN 5920-00-410-4384
NSN 6150-00-280-4500
NSN 6685-00-236-4443
NSN 6620-00-325-4693
NSN 5905-01-029-1545
NSN 5925-00-930-2265
NSN 5990-01-216-1276
NSN 6220-01-188-6962
NSN 5999-00-597-5054
NSN 5935-01-602-8714
NSN 5915-01-080-6661