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 6645-00-915-9397
NSN 6610-00-682-6215
NSN 5905-00-762-0085
NSN 5990-01-304-7597
NSN 5950-01-628-9682
NSN 5960-00-140-9583
NSN 6645-01-210-8180
NSN 5998-00-424-9174
NSN 6130-01-071-6927
NSN 5960-01-051-1454
NSN 6105-01-452-4434
NSN 5835-00-594-4921