1. Product name Spur gear, cylindrical gear, ring gears, involute gear ring, involute cylindrical gear. 2. Industrial Applications Metallurgy machinery, mining machinery, steel rolling equipment. 3. Manufacturing Capacity/Size Module 20 Pressure angle 20° Number of teeth 78 Accuracy DIN 8 4. Material ASTM 4140, ASTM 1045. Chinese standard: 42CrMo, 45#. We also manufacturer custom gears according ...