Gear accuracy: JIS B 1702-1 N8 equivalent Tooth profile: Ordinary teeth Pressure angle: 20° Heat treatment: None Tooth surface hardness: (194HB or less) Surface treatment: Black dye (no black dyeing in additional parts) Number of teeth: 50 Shape: S5K Standard circle diameter (mm): 250 牙齿宽度(mm):50 孔直径(mm):32 模块:5 牙齿尖端圆直径:260 总长度(mm):50 键groove b2 x t2(mm)