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 6105-01-131-9677
NSN 6610-00-105-1677
NSN 5935-01-658-5314
NSN 5910-01-581-8445
NSN 6610-01-211-6182
NSN 6135-01-463-2445
NSN 6150-00-159-8520
NSN 6220-01-332-0524
NSN 5960-01-359-6630
NSN 6620-00-643-1402
NSN 6110-01-042-0510
NSN 5985-00-149-1675