These are custom 17-4 stainless steel double end threaded studs made using 17-4 H1100 stainless material with heat treat required to finalize the parts.  200 pieces of the custom threaded studs were made domestically with a lead time of 2-3 weeks from confirmation.  2-1/4 inches of 1/2 coarse thread is incorporated with 1-3/4 inches of fine thread on the other side.  Full material and heat treat certs were provided with the parts and our internal part number is B6070-500.