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 5905-01-213-6100
NSN 5855-00-058-1293
NSN 5930-01-533-3784
NSN 5975-01-265-5055
NSN 6320-01-072-2073
NSN 5915-00-947-6551
NSN 5935-01-140-3736
NSN 7035-00-371-7749
NSN 2925-01-205-4584
NSN 4140-01-597-2287
NSN 5920-01-293-9921
NSN 5935-00-914-1773