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 6130-01-583-6348
NSN 6645-01-379-0593
NSN 2925-01-493-9904
NSN 6320-01-441-2438
NSN 6105-00-435-0693
NSN 6610-01-212-9817
NSN 5920-01-533-6743
NSN 5950-00-167-2490
NSN 6645-00-467-6094
NSN 5965-01-419-8200
NSN 5999-01-414-3375
NSN 6145-00-635-7998