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 5960-01-412-0619
NSN 6130-00-686-4906
NSN 6220-00-305-0801
NSN 6645-01-391-9820
NSN 5999-00-484-5325
NSN 2925-00-355-5130
NSN 5996-00-369-5299
NSN 5905-00-862-9362
NSN 6240-01-649-1520
NSN 6620-01-627-0478
NSN 5915-00-111-1905
NSN 5950-00-488-4835