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 6320-01-411-6610
NSN 2925-00-449-2478
NSN 6240-01-425-1939
NSN 5950-01-216-6135
NSN 6220-01-282-3720
NSN 6610-01-116-2527
NSN 5930-00-201-3013
NSN 5905-00-583-8520
NSN 5965-01-594-1983
NSN 5960-00-617-3129
NSN 4140-01-571-4935
NSN 5930-00-258-7450