Gear accuracy: equivalent to JIS B 1702-1 N7 class Tooth profile: regular teeth Pressure angle: 20° Heat treatment: Induction hardening on the tooth surface Gear hardness: 50-60HRC Surface treatment: Black dye other than the tooth portion (the fastening parts and additional parts are not blackened) Number of teeth: 50 Shape: S1EB 标准圆直径(mm):125 牙齿宽度(mm):25 孔直径(mm):28 模块:2.5 牙齿尖端圆形直径:130