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 5935-01-498-4425
NSN 5999-00-341-3102
NSN 5910-01-337-6042
NSN 5985-01-134-5252
NSN 6645-01-052-8331
NSN 6105-01-293-5236
NSN 5999-01-348-0852
NSN 5975-00-801-0638
NSN 5925-01-334-2930
NSN 6240-00-019-5835
NSN 6645-01-121-0530
NSN 6610-01-630-6817