最常用螺纹底孔对照表

55°圆柱内螺纹（RP）55°圆锥内螺纹（RC）规格钻i孔直径规格钻亍孔直径直径最大最小标准直径最大最小1/16-286.56.6326.491/16-286.36.3846.2441/8-288.58.6378.4951/8-288.38.3888.2491/4-1911.411.54911.3411/4-191111.17410.96238-1914.915.04514.84638-1914.514.65814.4481/2-1418.618.77318.4891/2-1418.118.26317.97934-142424.25923.9753/4-1423.523.66323.3781-1130.230.47230.111-1129.629.82229.45911/4-1138.839.13338.77111/4-1138.238.33937.97611/2-1144.745.02644.66411/2-114444.23243.8692-1156.556.83756.4752-1155.655.84455.412公制螺纹（M）55°非密封圆柱内螺纹（G）规格钻孔直径规格钻孔直径标准直径最大最小标准直径最大最小M10.750.7850.729-286.76.8436.561M21.61.6791.5671/8-288.78.8488.566M32.52.5992.459-1911.711.8911.445M43.33.4223.2423/8-1915.215.39514.95M54.24.3344.134-141919.17218.631M655.1534.9175/8-142121.12820.587M766.1535.917-1424.524.65824.117M86.86.9126.647-1428.228.41827.877M108.58.6768.376-1130.630.93130.291M1210.2510.44110.10611/8-1135.235.57934.939M141212.2111.83511/4-1139.239.59238.952M161414.2113.835-114545.48544.845M1815.515.74415.294-115151.42850.788M2017.517.74417.2942-115757.29656.656M2219.519.74419.29460°圆锥内螺纹（NPT）M242121.25220.752M272424.25223.752规格钻孔直径M3026.526.77126.211标准直径最大最小M3329.529.77129.2111/16-276.1356.2236.046M363232.2731.671/8-278.488.5688.393M393535.2734.67-1810.99611.12810.864M4237.537.79937.1293/8-1814.41614.54814.284M4540.540.79940.129-1417.81317.98317.642M484343.29742.587-1423.12723.29722.957M524747.48746.587-11.529.05929.26628.851M5650.550.99650.046-11.537.78437.99137.576M645858.50557.50511/2-11.543.8544.0643.646M726666.50565.5052-11.555.8656.0755.659