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 5999-01-068-0114
NSN 6130-01-284-4195
NSN 6240-00-244-0483
NSN 5999-01-415-1515
NSN 5935-00-794-8927
NSN 5950-01-293-5994
NSN 5895-01-496-3938
NSN 5925-01-564-3707
NSN 2925-00-275-1807
NSN 5905-00-931-4069
NSN 6645-00-441-8008
NSN 5935-01-054-4234