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 5930-00-278-7731
NSN 6110-01-025-6139
NSN 6150-00-096-6477
NSN 6105-01-269-5427
NSN 2925-01-159-0506
NSN 6105-01-380-4392
NSN 5835-01-490-9751
NSN 5835-01-426-6573
NSN 6645-00-262-7448
NSN 6220-01-398-5998
NSN 5915-01-541-1312
NSN 5835-01-502-9228