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 7035-00-541-8516
NSN 6610-00-942-3383
NSN 5835-01-218-5560
NSN 6130-00-905-9936
NSN 6685-01-408-5553
NSN 5999-01-477-5922
NSN 6220-01-430-7021
NSN 5855-00-400-2622
NSN 5965-01-026-9865
NSN 6685-01-397-6721
NSN 5855-01-388-4345
NSN 6620-00-475-9985