Gear accuracy: JIS B 1704:1978 Equivalent to grade 0 Heat treatment: Carburize and harden only the teeth Tooth surface hardness: 55-60HRC Module: 4 Number of teeth: 20 Standard circle diameter (mm): 80 Hole diameter (mm): 20 Assembly distance (mm): 65 总长度(mm):38 牙齿宽度(mm):18 形状:B4K >扭曲角:35° 尖端圆形直径(mm):81 boss Diameter(mm)(mm):55 boss长度(mm):17 点击:M5 钥匙凹槽:6 x 2.8 牙齿概况:Gleason 压力角(°):20