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 5950-01-568-1427
NSN 5945-00-244-1212
NSN 5990-01-443-2931
NSN 5935-00-909-0584
NSN 5990-01-251-7313
NSN 6220-01-390-4090
NSN 6685-01-277-9296
NSN 5905-01-590-8668
NSN 5855-00-797-8217
NSN 6105-01-429-8577
NSN 5895-00-449-7972
NSN 5935-01-076-4613