Gear accuracy: JIS B 1702-1 Before N9 grade heat treatment Heat treatment: Induction hardening on the tooth surface Tooth surface hardness: 50-60HRC Surface treatment: Black dye (no re-black dye after hardening) Module: 4 Number of teeth: 13 Standard circle diameter (mm): 73.54 Tooth width (mm):30 孔直径(mm):20 总长度(mm):50 扭曲方向:L形状:L形状:S1 boss直径(mm):60 boss长度(mm):20 boss尖端圆形直径:81.54直径尺寸将由于硬化而变形。 (孔直径尺寸公差而不是H7等级) 牙齿剖面:常规牙齿