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 4140-01-538-7421
NSN 7035-00-238-3662
NSN 6150-00-947-5736
NSN 4140-00-669-6109
NSN 6105-00-542-7948
NSN 7035-00-870-0290
NSN 5855-01-100-3272
NSN 5998-00-675-3560
NSN 2925-01-467-1192
NSN 5925-01-452-4493
NSN 6110-00-820-6264
NSN 5910-01-025-6987