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 4140-01-168-0158
NSN 6650-00-012-2430
NSN 6620-01-594-9215
NSN 5835-01-606-8768
NSN 5855-01-349-6135
NSN 6685-01-279-1994
NSN 5925-01-467-9910
NSN 5895-01-588-1217
NSN 5945-00-583-3283
NSN 6620-01-536-7799
NSN 5999-01-555-8141
NSN 6105-01-618-2735