Tapping a 7/16" X 20 TPI thread into 1/2" mild steel
7/16" X 20 holes in a 1/2"-thick fixture and pulling plate, made from common "fish plate". I'm going to drill the proper size holes with a 25/64" bit, tap the hole all the way through the 1/2" plate, and then bolt things to it for straightening, pulling and repair. I'm sure it will also serve as a fireproof welding table.
7/16" X 20 holes in a 1/2"-thick fixture and pulling plate, made from common "fish plate". I'm going to drill the proper size holes with a 25/64" bit, tap the hole all the way through the 1/2" plate, and then bolt things to it for straightening, pulling and repair. I'm sure it will also serve as a fireproof welding table.
