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 6130-01-120-8347
NSN 5895-01-445-7204
NSN 5855-01-088-3062
NSN 5905-00-314-3379
NSN 6220-01-219-9670
NSN 4140-01-420-6263
NSN 5930-01-275-3010
NSN 5910-01-382-4889
NSN 5990-01-164-8673
NSN 6150-01-062-9819
NSN 6650-01-245-0447
NSN 4140-01-077-3981