XXH型(节距=31.750mm) 规格节线长(mm)齿数625XXH1588.0050650XXH1651.0052700XXH1778.0056800XXH2032.0064900XXH2286.0072950XXH2413.00761000XXH2540.00801050XXH2667.00841200XXH3048.00961250XXH3175.001001400XXH3556.001121563XXH3968.751251600XXH4064.001281700XXH4318.001361800XXH4572.001441925XXH4889.501542000XXH5080.00160