模数m齿数z外径d压力角a变位系数x精度等级0.2510-50ø3-ø1320°04-60.310-50ø3.6-ø15.620°04-60.410-50ø4.8-ø20.820°04-60.510-50ø6-ø2620°04-60.610-50ø7.2-ø31.220°04-60.710-50ø8.4-ø36.420°04-60.810-50ø9.6-ø41.620°04-6110-50ø12-ø5220°04-6Gear'sModulusmNumberofteethzExternaldiameterdPressureangleaChange-sitecoefficientxprecisionclass0.2510-50ø3-ø1320°04-60.310-50ø3.6-ø15.620°04-60.410-50ø4.8-ø20.820°04-60.510-50ø6-ø2620°04-60.610-50ø7.2-ø31.220°04-60.710-50ø8.4-ø36.420°04-60.810-50ø9.6-ø41.620°04-6110-50ø12-ø5220°04-6)