螺纹底孔直径对照表

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1、螺纹底孔直径公制普通粗牙螺纹钻头直径螺纹代号HSS硬质合金M2×0.41.61.65M3×0.52.52.55M4×0.73.33.4M5×0.84.24.3M6×1.05.05.1M8×1.256.86.9M10×1.58.58.7M12×1.7510.310.5M14×2.012.012.2M16×2.014.014.2M18×2.515.515.7M20×2.517.517.7M24×3.021.0……M30×3.526.5……M36×4.032.0……M42×4.537.5……M45×4.540.5……M48×5.043.0……公制细牙螺纹钻头直径M20×1.0

2、1919.1螺纹代号HSS硬质合金M24×2.022.0……M2×0.251.751.75M24×1.522.5……M3×0.352.72.7M24×1.023.0……M4×0.53.53.55M30×327……M5×0.54.54.55M30×228……M6×0.756.36.35M30×1.528.5……M8×1.077.1M30×1.529……M8×0.757.37.35M36×3.033.0……M10×1.099.1M36×234.0……M10×1.258.88.9M36×1.534.5……M10×0.759.39.35M42×438……M12×1.510.51

3、0.7M42×339……M12×1.2510.810.9M42×240……M12×1.01111.1M42×1.540.5……M14×1.512.512.7M45×441……M14×1.013.013.1M45×342……M16×1.514.514.7M45×243……M16×1.015.015.1M45×1.543.5……M18×1.516.516.7M48×444.0……M18×1.01717.1M48×345.0……M20×2.01818.3M48×246.0……M20×1.518.518.7M48×1.546.5……（1）普通螺纹攻螺纹前底孔的钻头直径攻螺纹前底

4、孔直径的确定（2）非螺纹密封的管螺纹攻螺纹前钻底孔的钻头直径螺纹公称直径1/81/43/81/23/4111/413/811/2（"）每25.4mm内牙数281919141411111111钻头直径（mm）8.811.715.218.924.430.639.241.345.1（3）英制锥管螺纹和英制锥螺纹攻丝前钻底孔的钻头直径英制锥管螺纹英制锥螺公称直径每25.4mm钻头直径公称直径每25.4mm钻头直径（"）内牙数（mm）（"）内牙数（mm）1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.31/2

5、1417.93/41423.63/41423.211129.71111/229.211/41138.311/4111/237.911/21144.111/2111/243.921155.82111/256