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 7035-00-166-0339
NSN 6135-01-270-8601
NSN 5925-01-043-5270
NSN 5925-00-525-4037
NSN 5935-00-518-5027
NSN 5895-01-384-8500
NSN 5990-01-382-5364
NSN 6220-01-155-0628
NSN 6220-00-987-3806
NSN 2925-00-942-8541
NSN 5915-01-329-7559
NSN 6240-01-400-1311