3003 Aluminum Radiator Header Plate | Customized Automotive Radiator Components Product Description SUNHOPE's 3003 Aluminum Radiator Header Plate is designed for automotive radiator manufacturing and tube assembly. Made from 3003-grade aluminum, it offers high strength, heat resistance, and corrosion resistance for reliable use in radiator production. With a standard thickness of 1.5mm , this radiator header plate provides structural stability during assembly. Uniform tube