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 5999-00-455-8867
NSN 6620-00-159-0866
NSN 5965-00-067-0290
NSN 6150-01-100-4337
NSN 7035-01-411-6062
NSN 6105-00-993-5244
NSN 6220-01-360-5525
NSN 5998-01-625-2230
NSN 5998-01-400-0660
NSN 5985-01-563-5640
NSN 5935-01-629-9551
NSN 5835-01-442-6482