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 6135-01-231-4809
NSN 5915-01-312-6715
NSN 5999-00-789-2197
NSN 6145-01-422-1830
NSN 6685-01-087-4432
NSN 4140-00-983-1597
NSN 6320-01-610-4410
NSN 6220-01-622-5158
NSN 6645-00-950-9126
NSN 5950-01-548-5211
NSN 5905-01-547-4660
NSN 6150-01-188-8232