同步轮规格T2.5理论尺寸表同步轮各种规格主要部位理论尺寸表（挡边尺寸仅供参考）T2.5型（节距=2.50mm）同步轮规格齿数节径d外径do档边直径df档边内径db档边厚度h18-T2.51814.3213.791811119-T2.51915.1214.591812.5120-T2.52015.9215.391812.5121-T2.52116.7116.181812.5122-T2.52217.5116.982213123-T2.52318.3017.772213124-T2.52419.1018.572213125-T2.52519.8919.362213126-T2.52620.6920.162515127-T2.52721.4920.962515128-T2.52822.2821.752515129-T2.52923.0822.552515130-T2.53023.8723.342921132-T2.53225.4624.932921134-T2.53427.0626.533221136-T2.53628.6528.123221138-T2.53830.2429.713221140-T2.54031.8331.3034.524.5142-T2.54233.4232.8937.524.5144-T2.54435.0134.484027146-T2.54636.6136.084027148-T2.54838.2037.674027150-T2.55039.7939.264432160-T2.56047.7547.2251361.2)