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 6220-01-243-8661
NSN 5945-01-323-6743
NSN 6110-01-619-0634
NSN 5960-00-797-3700
NSN 6145-01-437-8595
NSN 6135-00-269-5843
NSN 5915-00-780-9884
NSN 6145-01-204-7021
NSN 7035-01-169-6551
NSN 6685-01-447-2226
NSN 6645-01-629-9657
NSN 5895-01-530-2375