同步带轮规格T20理论尺寸表同步带轮规格主要部位理论尺寸表（挡边尺寸仅供参考）同步带轮规格T20型（节距=20.00mm）同步带轮规格齿数节径d外径do档边直径df档边内径db档边厚度h18-T2018114.59111.76124984.519-T2019120.96118.131301044.520-T2020127.35124.491391101.521-T2021133.69130.861431174.522-T2022140.06137.231491234.523-T2023146.42143.591561304.524-T2024152.79149.961641341.525-T2025159.15156.321691351.526-T2026165.52162.691751431.527-T2027171.89169.061811554.528-T2028178.25175.421871614.529-T2029184.62181.791941684.530-T2030190.99188.162001744.532-T2032203.72200.8934-T2034216.45213.6236-T2036229.18226.3538-T2038241.92239.0940-T2040254.65251.8242-T2042267.38264.5544-T2044280.11277.2846-T2046292.85290.0248-T2048305.58302.7550-T2050318.31315.4860-T2060381.97379.14)