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 6645-01-416-9207
NSN 6135-00-461-3590
NSN 5935-00-822-8282
NSN 5925-00-160-4747
NSN 7035-00-546-2560
NSN 5965-01-334-7456
NSN 5895-00-599-4394
NSN 6645-01-050-5221
NSN 6620-00-321-0134
NSN 5998-01-333-2825
NSN 7035-01-129-7834
NSN 6620-01-043-6424