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 5999-00-355-9849
NSN 5910-01-441-3060
NSN 5950-01-146-4329
NSN 5935-00-375-5189
NSN 6105-00-722-4932
NSN 6320-01-567-9792
NSN 6320-00-036-3688
NSN 7035-01-537-2644
NSN 5835-00-864-0694
NSN 5835-01-572-9308
NSN 6645-01-500-0827
NSN 6650-01-041-0296