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 6320-00-422-9006
NSN 5835-00-198-4936
NSN 2925-01-543-0073
NSN 6220-01-092-5177
NSN 5975-00-276-7559
NSN 5935-01-116-0927
NSN 5855-01-438-4588
NSN 5960-00-021-5618
NSN 6620-00-407-0102
NSN 6105-01-487-7484
NSN 5935-01-224-7071
NSN 5985-01-575-8305