... . 3. 110ton, 160ton, 200ton, 250ton 1. With high rigidity design in machine frame, the machine body is welded of quality steel sheet ... tension elimination, improve stability and reliability of precision of the machine.2. With the optimization design, used high-grade alloy steel, double ... low cost, save energy. 110ton, 160ton, 200ton, 250ton double points open style stee c frame punching machine