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 5930-00-422-0682
NSN 6110-00-057-2432
NSN 6110-01-458-1006
NSN 7035-00-585-2113
NSN 5996-00-143-9377
NSN 6320-01-443-8676
NSN 5945-00-147-2068
NSN 6105-01-035-5387
NSN 6130-01-280-9315
NSN 6150-01-336-2785
NSN 5915-00-723-0570
NSN 6240-01-236-9330