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 5960-00-504-8790
NSN 6645-01-294-6403
NSN 6620-00-232-2048
NSN 5998-01-444-1434
NSN 6105-00-035-8809
NSN 6645-01-271-0248
NSN 5945-01-237-7303
NSN 6150-00-753-3950
NSN 5985-01-116-2363
NSN 6685-00-390-0912
NSN 5835-01-132-5894
NSN 2925-01-443-5929