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 5855-01-413-5645
NSN 6620-00-583-2687
NSN 6150-00-398-0833
NSN 5925-00-267-3044
NSN 6105-00-204-5497
NSN 5965-00-208-4896
NSN 6220-00-447-1054
NSN 4140-01-319-3486
NSN 5930-00-740-9384
NSN 6320-01-328-6575
NSN 6650-00-098-6128
NSN 5965-01-285-7356