Bar Material: 40Cr or 45# steel, round corner 5mm radius Helix Plate material conforms to ASTM A36 hot rolled plate helices thickness are available in 3/8 and 1/2 All helix leading edges sharpened and rock cut and 45 degrees. Corrosion protection to conform to ASTM A153 standard for hot dipped zinc coating A better conventional solid steel extra high strength helical screw pile Welded coupling for greater strength. Eliminates shaft heat damage caused by upset coupling process
