螺纹钻孔直径对照表

螺纹下孔径表公制粗牙螺纹 JIS B 0209-1982(單位：mm)註(1)以下等級：5H、以上等級：6H(2)基於JIS B 0209-1982標準螺纹下孔径表螺纹下孔径表註(1)等級：6H(2)基於JIS B 0211-1982標準螺纹下孔径表美制粗牙螺纹 (單位：mm)螺纹下孔径表美制細牙螺纹 (單位：mm)螺纹下孔径表英制粗牙螺纹(單位：mm)螺纹下孔径表英制管用螺纹 (單位：mm)螺纹下孔径表美制斜行管用螺纹 (NPT‧NPS) (單位：mm)上述钻头直径來源於美制管用螺纹ANSI／ASME —1983 Pipe Threads, General Purpose (Inch)標準。

螺纹下孔径表美制管用耐密斜行螺纹(NPTF‧NPSF) (單位：mm)上述钻头直径來源於美制管用耐密斜行螺纹ANSI —1957 Dryseal Pipe Threads (Inch)標準。

螺纹下孔径表(無屑絲攻用)公制螺纹(NRT) (單位：mm)螺纹下孔径表(無屑絲攻用)美制粗牙螺纹(NRT) (單位：mm)螺纹下孔径表(無屑絲攻用)美制細牙螺纹(NRT) (單位：mm)英制管用平行螺纹(NRT) (單位：mm)螺纹下孔径表(無屑絲攻用)公制螺纹(HRT) (單位：mm)螺纹下孔径表(護套螺纹用)公制粗牙螺纹 HL-NRT (單位：mm)螺纹下孔径表(護套螺纹用)公制粗牙螺纹 (單位：mm)公制細牙螺纹 (單位：mm)螺纹下孔径表(護套螺纹用)美制粗牙螺纹 (單位：mm)各 種 換 算 表山數節距換算表管用螺絲基準寸法(mm)。

螺纹钻孔直径对照表公制螺纹公制细牙螺纹55°圆柱内螺纹（Rp)55°圆锥内螺纹（Rc)55°非密封圆柱内螺纹（G)规格钻孔直径规格钻孔直径规格钻孔直径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标准直径最大最小标准直径最大最小标准直径最大最小M10.750.7850.729M1*0.20.80.8210.7831/16-28 6.5 6.632 6.491/16-28 6.3 6.384 6.2441/16-28 6.7 6.843 6.561 M2 1.6 1.679 1.567M2*0.25 1.725 1.785 1.7291/8-288.58.6378.4951/8-288.38.3888.2491/8-288.78.8488.566 M3 2.5 2.599 2.459M3*0.35 2.7 2.721 2.6211/4-1911.411.54911.3411/4-191111.17410.9621/4-1911.711.8911.445 M4 3.3 3.422 3.242M4*0.5 3.5 3.599 3.4593/8-1914.915.04514.8463/8-1914.514.65814.4483/8-1915.215.39514.95 M5 4.2 4.334 4.134M5*0.5 4.5 4.599 4.4591/2-1418.618.77318.4891/2-1418.118.26317.9791/2-141919.17218.631 M65 5.153 4.917M6*0.75 5.3 5.378 5.1883/4-142424.25923.9753/4-1423.523.66323.3785/8-142121.12820.587 M76 6.153 5.917M7*0.75 6.3 6.378 6.1881-1130.230.47230.111-1129.629.82229.4593/4-1424.524.65824.117 M8 6.8 6.912 6.647M8*177.153 6.91711/4-1138.839.13338.77111/4-1138.238.33937.9767/8-1428.228.41827.877 M108.58.6768.376M8*0.757.37.3787.18811/2-1144.745.02644.66411/2-114444.23243.8691-1130.630.93130.291 M1210.2510.44110.106M10*1.258.88.9128.6472-1156.556.83756.4752-1155.655.84455.41211/8-1135.235.57934.939 M141212.2111.835M10*199.1538.91711/4-1139.239.59238.952 M161414.2113.835M10*0.759.39.3789.18811/2-114545.48544.845 M1815.515.74415.294M12*1.510.510.67610.37613/4-115151.42850.788 M2017.517.74417.294M12*1.2510.810.91210.6472-115757.29656.656 M2219.519.74419.294M12*11111.15310.917M242121.25220.752M14*1.512.512.67612.376M272424.25223.752M14*1.2512.812.91212.647M3026.526.77126.211M14*11313.15312.917M3329.529.77129.211M16*1.514.514.67614.376M363232.2731.67M16*11515.15314.917M393535.2734.67M18*21616.2115.835M18*1.516.516.67616.376M18*11717.15316.917M20*21818.2117.835M20*1.518.518.67618.376M20*11919.15318.917M22*22020.2119.835M22*1.520.520.67620.376M22*12121.15320.917M24*22222.2121.835M24*1.522.522.67622.376M24*12323.15322.917M27*22525.2124.835M27*1.525.525.67625.376M27*12626.15325.917M30*32727.25226.752M30*22828.2127.835M30*1.528.528.67628.376M30*12929.15328.917M33*33030.25229.752M33*23131.2130.835M33*1.531.531.67631.376M36*33333.25232.752M36*23434.2133.835M36*1.534.534.67634.376M39**33636.25235.752M39*23737.2136.835M39*1.537.537.67637.376螺纹钻孔直径对照表60°圆锥内螺纹（NPT)60°圆柱内螺纹（NPSC)统一螺纹（UNF）统一螺纹（UNC）统一螺纹（UNEF）规格钻孔直径规格钻孔直径规格钻孔直径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标准直径最大最小标准直径最大最小标准直径最大最小1/16-27 6.135 6.223 6.0461/8-278.488.88.636N0.0-80 1.25 1.305 1.18N0.1-64 1.5 1.585 1.435N0.12-32 4.722 4.816 4.628 1/8-278.488.5688.3931/4-1811.3511.4711.227N0.1-72 1.55 1.612 1.473N0.2-56 1.78 1.872 1.6941/4-32 5.585 5.679 5.491 1/4-1810.99611.12810.8643/8-1814.7714.914.656N0.2-64 1.85 1.912 1.755N0.3-48 2.14 2.04 1.945/16-327.1727.2677.079 3/8-1814.41614.54814.2841/2-1417.81318.16117.642N0.3-56 2.1 2.197 2.024N0.4-40 2.27 2.385 2.1563/8-328.768.8548.666 1/2-1417.81317.98317.6423/4-1423.12723.49523.297N0.4-48 2.4 2.458 2.271N0.5-40 2.593 2.698 2.4877/16-2810.23710.34310.13 3/4-1423.12723.29722.9571-11.529.05929.48929.266N0.5-44 2.7 2.74 2.551N0.6-32 2.77 2.899 2.651/2-2811.82411.9311.717 1-11.529.05929.26628.85111/4-11.537.78438.25237.991N0.6-40 2.9 3.022 2.817N0.8-32 3.418 3.528 3.3079/16-2413.26513.38813.142 11/4-11.537.78437.99137.57611/2-11.543.8544.32344.06N0.8-36 3.5 3.606 3.401N0.10-24 3.814 3.949 3.685/8-2414.8514.97514.729 11/2-11.543.8544.0643.6462-11.555.8656.36356.07N0.10-32 4.1 4.165 3.967N0.12-24 4.46 4.59 4.3411/16-2416.4416.56316.317 2-11.555.8656.0755.659N0.12-28 4.6 4.724 4.5031/4-20 5.121 5.267 4.9753/4-2017.82117.96717.6751/4-28 5.5 5.588 5.3675/16-18 6.571 6.733 6.4113/16-2019.40919.55519.2635/16-24 6.97.035 6.7913/8-167.9798.1587.87/8-2020.99621.1420.853/8-248.58.6368.3797/16-149.359.559.14915/16-2022.58522.73122.4397/16-209.910.0339.7381/2-1310.79811.01310.5841-2024.17224.31824.0261/2-2011.511.60711.3269/16-1212.913.08112.76111/16-1825.62225.78425.4619/16-1812.913.08112.7615/8-1113.62213.86813.37611/8-1827.2127.37127.0495/8-1814.514.68114.3483/4-1016.56616.83216.29913/16-1828.79728.95928.6363/4-1617.517.67817.337/8-919.45819.74819.16911/4-1830.39430.55530.2337/8-1420.520.67520.261-822.2822.59821.96315/16-1831.9732.13331.811-1223.323.57123.10911/8-724.99825.34924.64813/8-1833.55933.7233.39811/8-1226.526.74626.28411/4-728.17328.52427.82317/16-1835.0735.23334.9111/4-1229.629.92129.45913/8-632.831.1230.34311/2-1836.73436.89636.57313/8-1232.833.09632.63411/2-633.90734.29533.51819/16-1838.1238.48338.1611/2-353636.27135.80913/4-539.3839.8138.9515/8-1839.90940.0739.7482-41/245.14445.59844.689111/16-1841.49741.65841.336。

螺纹：螺纹指的是在圆柱或圆锥母体表面上制出的螺旋线形的、具有特定截面的连续凸起部分。

螺纹按其母体形状分为圆柱螺纹和圆锥螺纹；按其在母体所处位置分为外螺纹、内螺纹，按其截面形状（牙型）分为三角形螺纹、矩形螺纹、梯形螺纹、锯齿形螺纹及其他特殊形状螺纹。

螺纹底径：螺纹底径=公称直径—1.08252*螺距。

底孔直径的确定丝锥在攻螺纹的过程中，切削刃主要是切削金属，但还有挤压金属的作用，因而造成金属凸起并向牙尖流动的现象，所以攻螺纹前，钻削的孔径（即底孔）应大于螺纹内径。

底孔直径：丝锥在攻螺纹的过程中，切削刃主要是切削金属，但还有挤压金属的作用，因而造成金属凸起并向牙尖流动的现象，所以攻螺纹前，钻削的孔径（即底孔）应大于螺纹内径。

底孔的直径可查手册或按下面的经验公式计算：脆性材料：钻孔直径d0=d(螺纹外径)-1.1p（螺距）塑性材料（钢、紫铜等）：钻孔直径d0=d(螺纹外径)-p（螺距）钻孔深度：攻盲孔（不通孔）的螺纹时，因丝锥不能攻到底，所以孔的深度要大于螺纹的长度，盲孔的深度可按下面的公式计算：孔的深度=所需螺纹的深度+0.7d公制螺纹的计算方法：底径=大径-1.0825*螺距英制螺纹的计算方法：底径=大径-1.28*螺距攻螺纹：攻螺纹是钳工金属切削中的重要内容之一，包括划线、钻孔、攻螺纹等环节。

攻螺纹只能加工三角形螺纹，属连接螺纹，用于两件或多件结构件的连接。

螺纹的加工质量直接影响到构建的装配质量效果，所以实习教学非常重视攻螺纹各环节的教学。

简介：工作部分是一段开槽的外螺纹。

丝锥的工作部分包括切削部分和校准部分。

手用丝锥一般由两支组成一套，分为头锥和二锥。

两支丝锥的外径、中径和内径均相等，只是切削部分的长短和锥角不同。

头锥较长，锥角较小，约有6个不完整的齿，以便切入。

二锥短些，锥角大些，不完整的齿约为2个。

铰杠是扳转丝锥的工具。

常用的是可调节式，以便夹持各种不同尺寸的丝锥。

划孔位线：划线时，钻孔是攻螺纹的基础。

螺纹下孔径表公制粗牙螺纹JIS B 0209-1982(單位：mm)螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M1× 0.25 0.75 0.78 (80%) 0.729 0.7851.1 × 0.25 0.85 0.88 (80%) 0.829 0.8851.2 × 0.25 0.95 0.98 (80%) 0.929 0.9851.4 × 0.3 1.1 1.14 (80%) 1.075 1.1421.6 × 0.35 1.25 1.32 (75%) 1.221 1.3211.8 × 0.35 1.45 1.52 (75%) 1.421 1.5212× 0.4 1.6 1.65 (80%) 1.567 1.6792.2 × 0.45 1.75 1.83 (75%) 1.713 1.8382.5 × 0.45 2.1 2.13 (75%) 2.013 2.1383× 0.5 2.5 2.59 (75%) 2.459 2.5993.5 × 0.6 2.9 3.01 (75%) 2.850 3.0104× 0.7 3.3 3.39 (80%) 3.242 3.4224.5 × 0.75 3.8 3.85 (80%) 3.688 3.8785× 0.8 4.2 4.31 (80%) 4.134 4.334 6× 1 5 5.13 (80%) 4.917 5.153 7× 1 6 6.13 (80%) 5.917 6.153 8× 1.25 6.8 6.85 (85%) 6.647 6.912 9× 1.25 7.8 7.85 (85%) 7.647 7.912 10× 1.5 8.5 8.62 (85%) 8.376 8.676 11× 1.5 9.5 9.62 (85%) 9.376 9.676 12× 1.75 10.3 10.40 (85%) 10.106 10.441 14× 2 12 12.2 (85%) 11.835 12.210 16× 2 14 14.2 (85%) 13.835 14.210 18× 2.5 15.5 15.7 (85%) 15.294 15.744 20× 2.5 17.5 17.7 (85%) 17.294 17.744 22× 2.5 19.5 19.2 (85%) 19.294 19.744 24× 3 21 21.2 (85%) 20.752 21.252 27× 3 24 24.2 (85%) 23.752 24.252 30× 3.5 26.5 26.6 (90%) 26.211 26.771 33× 3.5 29.5 29.6 (90%) 29.211 29.771 36× 4 32 32.1 (90%) 31.670 32.27039 × 4 35 35.1 (90%) 34.670 35.27042 × 4.5 37.5 37.6 (90%) 37.129 37.79945 × 4.5 40.5 40.6 (90%) 40.129 40.79948 × 5 43 43.1 (90%) 42.587 43.297 註(1)M1.4以下等級：5H、M1.6以上等級：6H(2)基於JIS B 0209-1982標準螺纹下孔径表公制細牙螺纹JIS B 0211-1982(單位：mm)螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M2.5 × 0.35 2.2 2.22 (75%) 2.121 2.221 3× 0.35 2.7 2.72 (75%) 2.621 2.7213.5 × 0.35 3.2 3.22 (75%) 3.121 3.2214× 0.5 3.5 3.59 (75%) 3.459 3.5994.5 × 0.5 4 4.09 (75%) 3.959 4.0995× 0.5 4.5 4.59 (75%) 4.459 4.5995.5 × 0.5 5 5.09 (75%) 4.959 5.0996× 0.75 5.3 5.35 (80%) 5.188 5.378 7× 0.75 6.3 6.35 (80%) 6.188 6.378 8× 1 7 7.13 (80%) 6.917 7.153 8× 0.75 7.3 7.35 (80%) 7.188 7.378 9× 1 8 8.13 (80%) 7.917 8.153 9× 0.75 8.3 8.35 (80%) 8.188 8.378 10× 1.25 8.8 8.85 (85%) 8.647 8.912 10× 1 9 9.13 (80%) 8.917 9.153 10× 0.75 9.3 9.35 (80%) 9.188 9.378 11 × 1 10 10.13 (80%) 9.917 10.15311 × 0.75 10.3 10.35 (80%) 10.188 10.37812 × 1.5 10.5 10.62 (85%) 10.376 10.676 12 × 1.25 10.8 10.85 (85%) 10.647 10.912 12 × 1 11 11.13 (80%) 10.917 11.153 14 × 1.5 12.5 12.62 (85%) 12.376 12.67614 × 1 13 13.13 (80%) 12.917 13.15315 × 1.5 13.5 13.62 (85%) 13.376 13.67615 × 1 14 14.13 (80%) 13.917 14.15316 × 1.5 14.5 14.62 (85%) 14.376 14.67616 × 1 15 15.13 (80%) 14.917 15.15317 × 1.5 15.5 15.62 (85%) 15.376 15.67617 × 1 16 16.13 (80%) 15.917 16.15318 × 2 16 16.2 (85%) 15.835 16.210 18 × 1.5 16.5 16.62 (85%) 16.376 16.676 18 × 1 17 17.13 (80%) 16.917 17.153 20 × 2 18 18.2 (85%) 17.835 18.210 20 × 1.5 18.5 18.62 (85%) 18.376 18.67622 × 2 20 20.2 (85%) 19.835 20.21022 × 1.5 20.5 20.62 (85%) 20.376 20.67622 × 1 21 21.13 (80%) 20.917 21.15324 × 2 22 22.2 (85%) 21.835 22.21024 × 1.5 22.5 22.62 (85%) 22.376 22.67624 × 1 23 23.13 (80%) 22.917 23.15325 × 2 23 23.2 (85%) 22.835 23.21025 × 1.5 23.5 23.62 (85%) 23.376 23.67625 × 1 24 24.13 (80%) 23.917 24.153螺纹下孔径表公制細牙螺纹JIS B 0211-1982(單位：mm)螺纹尺寸钻头直径崁合度區分：中(注1)2級(注2)下孔径崁合度區分：中(註1)2級(註2)內螺纹小径最小直径最大直径M26 × 1.5 24.5 24.62 (85%) 24.376 24.67627 × 2 25 25.2(85%) 24.835 25.21027 × 1.5 25.5 25.62 (85%) 25.376 25.67627 × 1 26 26.13 (80%) 25.917 26.15328 × 2 26 26.2(85%) 25.835 26.21028 × 1.5 26.5 26.62 (85%) 26.376 26.67628 × 1 27 27.13 (80%) 26.917 27.15330 × 3 27 27.2 (85%) 26.752 27.25230 × 2 28 28.2 (85%) 27.835 28.21030 × 1.5 28.5 28.62 (85%) 28.376 28.67630 × 1 29 29.13 (80%) 28.917 29.15332 × 2 30 30.2 (85%) 29.835 30.21032 × 1.5 30.5 30.62 (85%) 30.376 30.67633 × 3 30 30.2 (85%) 29.752 30.25233 × 2 31 31.2 (85%) 30.835 31.21033 × 1.5 31.5 31.62 (85%) 31.376 31.67635 × 1.5 33.5 33.62 (85%) 33.376 33.67636 × 3 33 33.2 (85%) 32.752 33.25236 × 2 34 34.2 (85%) 33.835 34.21036 × 1.5 34.5 34.62 (85%) 34.376 34.67638 × 1.5 36.5 36.62 (85%) 36.376 36.67639 × 3 36 36.2 (85%) 35.752 36.25239 × 2 37 37.2 (85%) 36.835 37.21039 × 1.5 37.5 37.62 (85%) 37.376 37.67640 × 3 37 37.2 (85%) 36.752 37.25240 × 2 38 38.2 (85%) 37.835 38.21040 × 1.5 38.5 38.62 (85%) 38.376 38.67642 × 4 38 38.1 (90%) 37.670 38.27042 × 3 39 39.2 (85%) 38.752 39.25242 × 1.5 40.5 40.62 (85%) 40.376 40.676 45 × 4 41 41.1 (90%) 40.670 41.270 45 × 3 42 42.2 (85%) 41.752 42.252 45 × 2 43 43.2 (85%) 42.835 43.210 45 × 1.5 43.5 43.62 (85%) 43.376 43.676 48 × 4 44 44.1 (90%) 43.670 44.270 48 × 3 45 45.2 (85%) 44.752 45.25248 × 2 46 46.2 (85%)45.835 46.21048 × 1.5 46.5 46.62 (85%) 46.376 46.67650 × 3 47 47.2 (85%) 46.752 47.25250 × 2 48 48.2 (85%) 47.835 48.21050 × 1.5 48.5 48.62 (85%) 48.376 48.676註(1)等級：6H(2)基於JIS B 0211-1982標準螺纹下孔径表美制粗牙螺纹(單位：mm)螺纹尺寸钻头直径2B級螺纹下孔径內螺纹小径最小直径最大直径NO.1 -64UNC 1.55 1.57 (65%) 1.425 1.5822 -56 1.8 1.86 (65%) 1.695 1.8713 -48 2.1 2.14 (65%) 1.941 2.1464 -40 2.3 2.36 (70%) 2.157 2.3855 -40 2.6 2.69 (70%) 2.487 2.6976 -32 2.8 2.86 (75%) 2.642 2.8958 -32 3.4 3.52 (75%) 3.302 3.53010 -24 3.9 3.91 (80%) 3.683 3.96212 -24 4.5 4.57 (80%) 4.344 4.5971/4-20 5.1 5.25 (80%) 4.979 5.257 5/16-18 6.6 6.72 (80%) 6.401 6.731 3/8-16 8 8.15 (80%) 7.798 8.153 7/16 -14 9.4 9.50 (80%) 9.144 9.550 1/2-13 10.8 11.0 (80%) 10.592 11.023 9/16 -12 12.2 12.3 (85%) 11.989 12.446 5/8-11 13.6 13.8 (85%) 13.386 13.868 3/4-10 16.5 16.8 (80%) 16.307 16.840 7/8-9 19.5 19.6 (85%) 19.177 19.7611 -8 22.2 22.5 (85%) 21.971 22.60611/8 -7 25 25.2 (85%) 24.638 25.349 11/4 -7 28.2 28.4 (85%) 27.813 28.524 13/8 -6 30.8 31.0 (85%) 30.353 31.115 11/2 -6 34 34.2 (85%) 33.528 34.290 13/4 -5 39.5 39.8 (85%) 38.964 39.8272 - 4 45.2 45.3 (90%) 44.679 45.593螺纹下孔径表美制細牙螺纹(單位：mm)螺纹尺寸钻头直径2B級螺纹下孔径內螺纹小径最小直径最大直径NO.0-80UNF1.25 1.30 (65%) 1.182 1.3051 -72 1.55 1.61 (65%) 1.474 1.6122 -64 1.85 1.90 (65%) 1.756 1.9123 -56 2.1 2.17 (70%) 2.025 2.1974 -48 2.4 2.44 (70%) 2.271 2.4585 -44 2.7 2.74 (70%) 2.551 2.7406 -40 2.9 3.02 (70%) 2.820 3.0228 -36 3.5 3.59 (75%) 3.404 3.60610 -32 4.1 4.14 (80%) 3.963 4.16512 -28 4.6 4.70 (80%) 4.496 4.7241/4-28 5.5 5.56 (80%) 5.360 5.5885/16-24 6.9 7.02 (80%) 6.782 7.035 3/8-24 8.5 8.61 (80%) 8.382 8.6367/16-20 9.9 10.01 (80%) 9.729 10.033 1/2-20 11.5 11.60 (80%) 11.329 11.6079/16-18 12.9 13.07 (80%) 12.751 13.081 5/8-18 14.5 14.65 (80%) 14.351 14.681 3/4-16 17.5 17.59 (85%) 17.323 17.678 7/8-14 20.5 20.6(85%) 20.270 20.675 1-12 23.2 23.5(85%) 23.114 23.5711 1/8 -12 26.5 26.7(80%) 26.289 26.7461 1/4 -12 29.5 29.9(80%) 29.464 29.9211 3/8 -12 32.8 33.0(85%) 32.639 33.0961 1/2 -12 36 36.2(85%) 35.814 36.271螺纹下孔径表英制粗牙螺纹(單位：mm)螺纹尺寸下孔径嵌合率A列(硬材質) B列(軟材質) A列直径B列直径內螺纹最小径內螺纹最大径W 1/8 2.6 2.5 70.7 83.0 70.0 88.3 3/16 3.7 3.6 78.4 85.8 70.0 88.3 1/4 5.1 5.0 76.9 83.0 70.5 88.3 5/16 6.6 6.5 74.0 99.5 70.1 88.4 3/8 8.0 7.9 75.0 80.0 69.5 88.2 7/16 9.4 9.3 73.7 80.0 69.0 88.81/2 10.7 10.5 73.8 81.2 69.0 88.29/16 12.3 12.0 73.4 84.4 69.0 88.25/8 13.7 13.5 73.5 80.3 69.6 88.53/4 16.7 16.5 72.3 78.4 69.6 88.37/8 19.5 19.3 75.4 80.9 70.1 88.41 22.4 22.0 73.8 83.6 71.0 88.21 1/825.0 24.8 76.9 81.3 72.0 88.41 1/428.3 28.0 74.3 80.7 72.0 88.41 3/830.5 30.3 81.6 85.3 73.8 88.61 1/233.8 33.5 79.3 84.8 73.8 88.61 5/836.0 35.7 81.1 85.7 74.8 88.31 3/439.2 39.0 80.7 83.8 74.8 88.31 7/841.8 41.5 80.6 84.7 74.7 88.42 45.0 44.7 80.2 84.4 74.7 88.4螺纹下孔径表英制管用螺纹(單位：mm)管用螺纹尺寸JIS B 0203 JIS B 2301 錐管內螺纹Rc(PT) 平行內螺纹Rp(PS) 錐管內螺纹計算值下孔径計算值下孔径計算值下孔径1/16 6.230 6.2 6.490 6.5 －－1/8 8.235 8.2 8.495 8.5 8.191 8.2 1/4 10.941 10.9 11.341 11.4 10.945 10.9 3/8 14.428 14.4 14.846 14.9 14.388 14.4 1/2 17.950 18 18.489 18.5 17.943 18 3/4 23.349 23 23.975 24 23.305 23 1 29.423 29 30.111 30 29.353 29 1 1/437.940 38 38.772 39 37.890 381 1/243.833 44 44.565 45 43.720 432 55.412 55 56.476 56 55.406 552 1/270.701 71 72.009 72 70.788 703 83.201 83 84.709 85 83.364 833 1/295.547 96 97.155 97 95.747 954 107.834 108 109.855 110 108.322 1085 133.110 133 135.255 135 133.597 1336 158.510 159 160.655 161 158.810 1587 183.360 183 185.954 1868 208.560 209 211.354 2129 233.960 234 236.754 23710 259.166 259 262.154 26212 309.747 310 312.875 313螺纹下孔径表英制平行管用螺纹PF(G) (單位：mm) 螺纹下孔径內螺纹小径(參考)尺寸大径標準嵌合高度H系列100 95 90 85 80 75 70 65 60 最小直径最大直径G 1/16 7.723 0.5808 6.56 6.62 6.68 6.74 6.79 6.85 6.91 6.97 7.03 6.843 6.561 G(PF)1/8 9.728 〞8.57 8.62 8.68 8.74 8.80 8.86 8.92 8.97 9.03 8.848 8.566 1/4 13.157 0.8560 11.53 11.62 11.70 11.79 11.87 11.96 12.04 12.13 11.890 11.445 3/8 16.662 〞14.95 15.04 15.12 15.21 15.29 15.38 15.46 15.55 15.64 15.395 14.950 1/2 20.955 1.1618 18.8 18.9 19.0 19.1 19.2 19.3 19.4 19.6 19.172 18.631 5/8 22.911 〞20.6 20.7 20.8 20.9 21.0 21.2 21.3 21.4 21.5 21.130 20.589 3/4 26.441 〞24.2 24.4 24.5 24.6 24.7 24.8 24.9 25.0 24.658 24.117 7/8 30.201 〞27.9 28.0 28.1 28.2 28.3 38.5 28.6 28.7 28.8 28.418 27.877 1 33.249 14.786 30.3 30.4 30.6 30.7 30.9 31.0 31.2 31.3 31.5 30.931 30.2911 1/837.897 〞35.1 35.2 35.4 35.5 35.7 35.8 35.9 36.5 35.579 34.939 1 1/441.910 〞39.0 39.1 39.2 39.4 39.6 39.7 39.8 40.0 40.1 39.592 38.952 1 3/844.323 〞41.4 41.5 41.7 41.8 42.0 42.1 42.2 42.4 42.6 42.005 41.3651 1/247.803 〞45.0 45.1 45.3 45.4 45.6 45.7 45.9 46.0 45.485 49.0231 5/851.910 〞49.2 49.3 49.5 49.6 49.8 49.9 50.0 50.2 49.672 50.7881 3/453.746 〞50.8 50.9 51.1 51.2 51.4 51.5 51.7 52.0 52.0 51.428 56.6562 59.614 〞56.8 57.0 57.1 57.2 57.4 57.5 57.8 57.8 57.296使用粗線左側數據作為攻絲前的底孔直径，可加工符合JIS B 0202的A級或B級的內螺纹小径。

螺纹攻牙-钻孔直径对照表螺纹攻牙钻孔径和滚造径对照表.某某某某某某本表依据二级牙制订公制粗螺纹规格M1.0某0.25M1.1某0.25M1.2某0.25M1.4某0.3M1.6某0.35M1.7某0.35M1.8某0.35M2.0某0.4M2.2某0.45M2.3某0.4M2.5某0.45M2.6某0.45M3.0某0.5M3.0某0.6M3.5某0.6M4.0某0.7M4.0某0.75M4.5某0.75M5.0某0.8M5.0某0.9M6.0某1.0M7.0某1.0M8.0某1.25M9.0某1.25M10某1.5M11某1.5M12某1.75M14某2.0M16某2.0M18某2.5M20某2.5M22某2.5M24某3.0M27某3.0M30某3.5标准径0.750.850.951.101.251.351.451.601.751.902.102.202.502.402.903.30 3.253.804.204.105.006.006.807.808.509.5010.3012.0014.0015.5017.5 019.5021.0024.0026.50二级牙钻孔径最大0.7850.8850.9851.1421.3211.4211.5211.6791.8381.9792.1382.2382.59 92.4403.0103.4223.3263.8784.3344.1705.1536.1536.9127.9128.6769.6 7610.44112.21014.21015.74417.74419.74421.25224.25226.771最小0.7290.8290.9291.0751.2211.3211.4211.5671.7131.8672.0132.1132.45 92.2802.8503.2423.1063.6884.1343.9304.9175.9176.6477.6478.3759.3 7610.10611.83513.83515.29417.29419.29420.75223.75226.211M12某1.0M12某0.5M14某1.5M14某1.0M15某1.5M15某1.0M16某1.5M16某1.0M17某1.5M17某1.0M18某2.0M18某1.5M18某1.0M20某2.0M20某1.5M20某1.0M22某2.0M22某1.5M22某1.0M24某2.0M24某1.5M24某1.0M25某2.0M25某1.5M25某1.0M26某1.5M27某2.0M27某1.5M27某1.0M28某2.0M28某1.5M28某1.0M30某3.0M30某2.0M30某1.5M30某1.0M32某2.0M32某1.5M33某3.0M33某2.0M33某1.5M35某1.5M36某3.0M36某2.0M36某1.511.0011.5012.5013.0013.5014.0014.5015.0015.5016.0016.0016.5017.0018.0018.5019.0020.0020.5021.0022.0022.5023.0023.0023.5024.00 24.5025.0025.5026.0026.0026.5027.0027.0028.0028.5029.0030.0030.5 030.0031.0031.5033.5033.0034.0034.50公制细螺纹规格标准径二级牙钻孔径最大11.15311.52012.67613.15313.67614.15314.67615.15315.67616.15316. 21016.67517.15318.21018.67619.15320.21020.67621.15322.21022.676 23.15323.21022.67624.15324.67625.21025.67626.15326.21026.67627. 15327.25228.21028.67629.15330.21030.67630.25231.21031.67633.676 33.25234.21034.676最小10.91711.40012.37612.91713.37613.91714.37614.91715.37615.91715. 83516.37616.91717.83518.37618.91719.83520.37620.91721.83523.376 22.91722.83523.37623.91724.37624.83525.37625.91725.83526.37626. 91726.75227.83528.37628.91729.83530.37629.75230.83531.37633.376 32.75233.83534.376公制迫牙丝攻钻孔径规格G1-G6M1.0某0.25M1.1某0.25M1.2某0.25M1.4某0.3M1.6某0.35M1.7某0.35M1.8某0.35M2.0某0.4M2.2某0.45M2.3某0.4M2.5某0.45M2.6某0.45M3.0某0.5M3.5某0.6M4.0某0.7M5.0某0.8M6.0某1.0M7.0某1.0M8.0某1.25M10某1.5M10某1.25M12某1.75M12某1.250.860.961.061.241.411.511.611.781.952.082.252.352.733.173.6 24.565.456.457.319.189.3111.0411.31美制迫牙丝攻钻孔径规格G9............................3.694.645.556.557.449.329.4411.21 11.44NO.2-56UNCNO.3-48NO.4-40NO.5-40NO.6-32NO.8-32NO.10-24NO.12-241/43/81/2-20-16-135/16-187/16-14NO.2-64UNFNO.3-56NO.4-48NO.5-44NO.6-40NO.8-36NO.10-32NO.12-291/43/81/2-28-24-205/16-247/16-20英制螺纹规格G9....................8.8110.3011.82......................10.5412.13W1/8-40W5/32-32W3/16-24W1/4-20W5/16-18W3/8-16W7/16-14W1/2-12W9/16-12W5/8-11W3/4-10W7/8W1-9-8精度等级G7-G80.880.981.081.251.431.531.631.801.982.102.282.382.753.203.654 .605.506.507.389.259.3811.1211.38精度等级G1-G61.942.232.502.833.073.734.244.90..........1.972.272.562.863.16 3.784.394.995.857.36......钻孔径硬材2.653.253.755.106.608.009.4010.7012.3013.7016.7019.5022.4025.002 8.30G7-G8..........3.774.304.965.727.248.7410.2011.27............4.435 .045.907.419.0010.4812.07W1-1/8-7W1-1/4-7针车用螺纹规格SM1/8SM1/8-40-44滚造径2.735-2.6882.769-2.7223.128-3.0833.855-3.8054.205-4.1554.143-4.0935.325-5.5705.890-5.7355.721-5.3666.508-6.6488.092-8.4328.880-8.01510.466-10.40110.037-9.95711.319-11.74913.400-13.425SM9/64-40SM11/64-40SM3/16-32美制粗螺纹规格(UNC)NO.1-64(1.854)NO.2-56(2.184)NO.3-48(2.515)NO.4-40(2.845)NO.5-40(3.175)NO.6-32(3.505)NO.8-32(4.166)NO.10-24(4.826)NO.12-24(5.486)1/45/163/87/161/29/165/83/47/811-1/81-1/41-3/81-1/21-3/4-20-18-16-14-13-12-11-10-9-8-7-6-5SM3/16-28标准径1.551.802.102.302.602.803.403.904.505.106.608.009.4010.8012.2013 .6016.5019.5022.2025.0028.2030.8034.0039.5045.20二级牙钻孔径最大1.5821.8712.1462.3852.6972.8953.5303.9624.5975.2576.7318.1539.5 5011.02312.44612.86818.84019.76122.60625.34928.52431.11534.2903 9.82745.593英制管螺纹规格PS1/16-28PSPSPSPSPSPS1/8-281/4-193/8-191/2-143/4-141-11SM7/22-最小1.4521.6951.9412.1572.4872.6423.3023.6834.3444.9796.4017.7989.1 4410.59211.98911.38616.30719.17721.97124.63827.81330.35333.5283 8.96444.679标准径6.508.5011.4015.0018.5024.0030.2038.8044.8056.50钻孔径最大6.6328.63711.54915.05418.77324.25930.47139.13245.02556.836SM15/64-28SM1/4SM1/4-40-28最小6.4908.49511.34114.84618.48923.97530.11138.77244.66556.476SM9/32-28SM11/32-28SM3/8-28公制细螺纹规格M1.0某0.2M1.1某0.2M1.2某0.2M1.4某0.2M1.6某0.2M1.7某0.2M1.8某0.2M2.0某0.25M2.2某0.25M2.3某0.25M2.5某0.35M2.6某0.35M3.0某0.35M3.5某0.35M4.0某0.5M4.5某0.5M5.0某0.5M5.5某0.5M6.0某0.75M6.0某0.5M7.0某0.75M7.0某0.5M8.0某1.0M8.0某0.75M8.0某0.5M9.0某1.0M9.0某0.75M10某1.25M10某1.0M10某0.75M10某0.5M11某1.0M11某0.75M12某1.5M12某1.25SM7/16-28SM7/16-16SM1/2-20标准径0.800.901.001.201.401.451.601.751.952.052.202.202.703.203.504.0 04.505.005.305.506.306.507.007.307.508.008.308.809.009.309.5010.0010.3010.5010.80二级牙钻孔径最大0.8210.9211.0211.2211.4211.5001.6211.7851.9852.0612.2212.2462.7 213.2213.5994.0994.5995.0995.3785.5506.3786.5507.1537.3787.5208 .1538.3788.9129.1539.3788.52010.15310.37810.67610.912最小0.7830.8830.9831.1831.3831.4601.5831.7291.9292.0012.1212.1862.6 213.1213.4593.9594.4594.9595.1885.4006.1886.4006.9177.4887.4007 .9178.1888.6478.9179.1889.4009.91710.18810.37510.647PS1-1/4-11PS1-1/2-11PS2-11SM9/16-20英制管螺纹规格PT1/16-28PT1/8PT1/4PT3/8PT1/2PT3/4PT1-28-19-19-14-14-11标准径最大6.108.1010.7014.2017.6023.0029.0037.5043.4054.90最小6.208.2011.0014.5018.0023.5029.5038.0044.0055.5006.2448.24910.96214.44817.97923.37829.45937.97643.86955.4126.3848.38811.17414.65818.26323.66329.82238.33944.23255.844公制螺纹规格M3某0.5M3.0某0.6M3.5某0.6M4.0某0.7M4.0某0.75M4.5某0.75M5.0某0.8M5.0某0.9M6.0某1.0M7.0某1.0M8.0某1.0M8.0某1.25美制细螺纹规格(UNF)NO.0-80(1.524)NO.1-72(1.854)NO.2-64(2.184)NO.3-56(2.515)NO.4-48(2.845)NO.5-44(3.175)NO.6-40(3.505)NO.8-36(4.166)NO.10-32(4.826)NO.12-28(5.846)1/43/81/25/83/47/81-28-24-20-18-16-14-125/16-247/16-203/16-18滚造径2.63-2.602.56-2.533.06-3.033.49-3.453.45-3.413.96-3.924.43-4.384.36-4.345.30-6.256.30-6.257.28-7.237.12-7.07标准径1.251.551.852.102.402.702.903.504.104.605.505.908.509.9011.5012. 9014.5017.5020.5023.2026.5029.5032.8036.00二级牙钻孔径最大1.3051.6121.9122.1972.4582.7403.0223.6064.1654.7245.5887.0358.6 3610.03311.60713.08114.68117.67820.67523.57126.74629.92133.0963 6.271最小1.1821.4741.7562.0252.2712.5512.8203.4043.9634.4962.3605.7828.3 829.72911.32912.75114.35117.32320.27023.11426.28929.46432.63935 .814PT1-1/4-11PT1-1/2-11PT2-112-4-1/2美制特细螺纹规格(UNEF)NO.12-321/45/163/87/161/29/165/83/47/81-32-32-32-28-28-24-24-20-20-20英制管螺纹钻孔径规格1/16-271/81/43/81/23/41-27-18-18-14-14-11-1/26.108.3310.7214.2717.4822.6328.5837.3143.6655.58标准径4.705.607.108.7010.2011.8013.2014.8017.8021.0024.00二级牙钻孔径最大4.8255.6907.2648.86510.33811.93813.38614.98617.95821.13324.308NPT6.258.4311.1314.2717.8623.0128.9837.6944.0455.96NPS6.358.7411.1314.6818.2523.4229.3638.1044.4556.36英制电器螺纹规格28A38A48A58A68A钻孔径4.0-4.23.0-3.22.7-2.82.4-2.51-1/8-121-1/4-121-3/8-121-1/2-121-1/4-11-1/21-1/2-11-1/22-11-1/2螺纹攻牙钻孔径和滚造径对照表.某某某某某某本表依据二级牙制订径和滚造径对照表.英制螺纹钻孔径软材2.603.203.705.006.507.909.3010.5012.0013.5016.5019.3022.0024.802 8.00针车用螺纹滚造径2.735-2.6882.769-2.7223.128-3.0833.855-3.8054.205-4.1554.143-4.0935.325-5.5705.890-5.7355.721-5.3666.508-6.6488.092-8.4328.880-8.01510.466-10.40110.037-9.95711.319-11.74913.400-13.425公制螺纹滚造径2.63-2.602.56-2.533.06-3.033.49-3.453.45-3.413.96-3.924.43-4.384.36-4.345.30-6.256.30-6.257.28-7.237.12-7.07英制电器螺纹钻孔径4.0-4.23.0-3.22.7-2.82.4-2.5径和滚造径对照表.纹纹螺。

螺丝攻牙钻孔径和滚丝径对照表公制粗螺纹 2 级牙钻孔径 规格 M1.0× 0.25 M1.1× 0.25 M1.2× 0.25 M1.4× 0.3 M1.6× 0.35 M1.7× 0.35 M1.8× 0.35 M2.0× 0.4 M2.2× 0.45 M2.3× 0.4 M2.5× 0.45 M2.6× 0.45 M3.0× 0.5 M3.0× 0.6 M3.5× 0.6 M4.0× 0.7 M4.0× 0.75 标准径 最大 0.75 0.85 0.95 1.10 1.25 1.35 1.45 1.60 1.75 1.90 2.10 2.20 2.50 2.40 2.90 3.30 3.25 0.785 0.885 0.985 1.142 1.321 1.421 1.521 1.679 1.838 1.979 2.138 2.238 2.599 2.440 3.010 3.422 3.326 最小 0.729 0.829 0.985 1.075 1.221 1.321 1.421 1.567 1.713 1.867 2.013 2.113 2.459 2.280 2.850 3.242 3.106 NO.1-64(1.854) NO.2-56(2.184) NO.3-48(2.515) NO.4-40(2.845) NO.5-40(3.175) NO.6-32(3.505) NO8-32(4.166) NO.10-24(4.826) NO.12-24(5.486) 1/4-20 5/16-18 3/8-16 7/16-14 1/2-13 9/16-12 5/8-11 3/4-101美制粗螺纹 2 级牙钻孔径 规格（UNC） 标准径 最大 1.55 1.80 2.10 2.30 2.60 2.80 3.40 3.90 4.50 5.10 6.60 8.00 9.40 10.80 12.20 13.60 16.50 1.582 1.871 2.146 2.385 2.697 2.895 3.53 3.962 4.597 5.257 6.731 8.153 9.55 11.023 12.446 12.868 18.840 最小 1.425 1.695 1.941 2.157 2.487 2.642 3.302 3.683 4.344 4.979 6.401 7.798 9.144 10.592 11.989 13.386 16.307M4.5× 0.75 M5.0× 0.8 M5.0× 0.9 M6.0× 1.0 M7.0× 1.0 M8.0× 1.25 M9.0× 1.25 M10× 1.5 M11× 1.5 M12× 1.75 M14× 2.0 M16× 2.0 M18× 2.5 M20× 2.5 M22× 2.5 M24× 3.0 M27× 3.0 M30× 3.5签名档：3.80 4.20 4.10 5.00 6.00 6.80 7.80 8.50 9.50 10.30 12.00 14.00 15.50 17.50 19.50 21.00 24.00 26.503.878 4.334 4.170 5.153 6.153 6.912 7.912 8.676 9.676 10.441 12.210 14.210 15.744 17.744 19.744 21.252 24.252 26.7713.688 4.134 3.930 4.917 5.917 6.647 7.647 8.376 9.376 10.106 11.835 13.835 15.294 17.294 19.294 20.752 23.752 26.2117/8-9 1 1-1/8-7 1-1/4-7 1-3/8-6 1-1/2-6 1-3/4-5 2-4-1/219.50 22.20 25.00 28.20 30.80 34.00 39.50 45.2019.761 22.606 25.349 28.524 31.115 34.290 39.827 45.59319.177 21.971 24.638 27.813 30.353 33.528 38.964 44.6792螺丝攻牙钻孔径和滚丝径对照表公制细螺纹 2 级牙钻孔径 规格 M1.0× 0.2 M1.1× 0.2 M1.2× 0.2 M1.4× 0.2 M1.6× 0.2 M1.7× 0.2 M1.8× 0.2 M2.0× 0.25 M2.2× 0.25 M2.3× 0.25 M2.5× 0.35 M2.6× 0.35 M3.0× 0.35 M3.5× 0.35 M4.0× 0.5 M4.5× 0.5 M5.0× 0.5 标准径 最大 0.80 0.90 1.00 1.20 1.40 1.45 1.60 1.75 1.95 2.05 2.20 2.20 2.70 3.20 3.50 4.00 4.50 0.821 0.921 1.021 1.221 1.421 1.500 1.621 1.785 1.985 2.061 2.221 2.246 2.721 3.221 3.599 4.099 4.599 最小 0.783 0.883 0.983 1.183 1.383 1.460 1.583 1.729 1.929 2.001 2.121 2.186 2.621 3.121 3.459 3.959 4.459 NO.0-80(1.524) NO.1-72(1.854) NO.2-64(2.184) NO.3-56(2.515) NO.4-48(2.845) NO.5-44(3.175) NO.6-40(3.505) NO.8-36(4.166) NO.10-32(4.826) NO.12-28(5.846) 1/4-28 5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 5/8-183美制细螺纹 2 级牙钻孔径 规格（UNC） 标准径 最大 1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 1.305 1.612 1.912 2.197 2.458 2.740 3.022 3.606 4.165 4.724 5.588 7.035 8.636 10.033 11.607 13.081 14.681 最小 1.182 1.474 1.756 2.025 2.271 2.551 2.820 3.404 3.963 4.496 5.360 6.782 8.382 9.729 11.329 12.751 14.351M5.5× 0.5 M6.0× 0.75 M6.0× 0.5 M7.0× 0.75 M7.0× 0.5 M8.0× 1.0 M8.0× 0.75 M8.0× 0.5 M9.0× 1.0 M9.0× 0.75 M10× 1.25 M10× 1.0 M10× 0.75 M10× 0.55.00 5.30 5.50 6.30 6.50 7.00 7.30 7.50 8.00 8.30 8.80 9.00 9.30 9.505.099 5.378 5.550 6.378 6.550 7.153 7.378 7.520 8.153 8.378 8.912 9.153 9.378 9.5204.959 5.188 5.400 6.188 6.400 6.917 7.188 7.400 7.917 8.188 8.647 8.917 9.188 9.4003/4-16 7/8-14 1-12 1-1/8-12 1-1/4-12 1-3/8-12 1-1/2-1217.50 20.50 23.20 26.50 29.50 32.80 36.0017.678 20.675 23.571 26.746 29.921 33.096 36.27117.323 20.270 23.114 26.289 29.464 32.639 35.814螺丝攻牙钻孔径和滚丝径对照表 公制细螺纹 2 级牙钻孔径 规格 M11× 1.0 标准径 最大 10.00 10.153 最小 9.9174美制细螺纹 2 级牙钻孔径 规格（UNC） 标准径 最大 最小M11× 0.75 M12× 1.5 M12× 1.25 M12× 1.0 M12× 0.5 M14× 1.5 M14× 1.0 M15× 1.5 M15× 1.0 M16× 1.5 M16× 1.0 M17× 1.5 M17× 1.0 M18× 2.0 M18× 1.5 M18× 1.0 M20× 2.0 M20× 1.5 M20× 1.0 M22× 2.0 M22× 1.510.30 10.50 10.80 11.00 11.50 12.50 13.00 13.50 14.00 14.50 15.00 15.50 16.00 16.00 16.50 17.00 18.00 18.50 19.00 20.00 20.5010.378 10.676 10.912 11.153 11.520 12.676 13.153 13.676 14.153 14.676 15.153 15.676 16.153 16.210 16.676 17.153 18.210 18.676 19.153 20.210 20.67610.188 10.376 10.647 10.917 11.400 12.376 12.917 13.376 13.917 14.376 14.917 15.376 15.917 15.835 16.376 16.917 17.835 18.376 18.917 19.835 20.3765M22× 1.0 M24× 2.0 M24× 1.5 M24× 1.0 M25× 2.0 M25× 1.5 M25× 1.0 M26× 1.5 M27× 2.0 M27× 1.5 M27× 1.0 M28× 2.0 M28× 1.5 M28× 1.0 M30× 3.0 M30× 2.0 M30× 1.5 M30× 1.0 M32× 2.0 M32× 1.5 M33× 3.021.00 22.00 22.50 23.00 23.00 23.50 24.00 24.50 25.00 25.50 26.00 26.00 26.50 27.00 27.00 28.00 28.50 29.00 30.00 30.50 30.0021.153 22.210 22.676 23.153 23.210 23.676 24.153 24.676 25.210 25.676 26.153 26.210 26.676 27.153 27.252 28.210 28.676 29.153 30.210 30.676 30.25220.917 21.835 22.376 22.917 22.835 23.376 23.917 24.376 24.835 25.376 25.917 25.835 26.376 26.917 26.752 27.835 28.376 28.917 29.835 30.376 29.7526M33× 2.0 M33× 1.5 M35× 1.5 M36× 3.0 M36× 2.0 M36× 1.5 签名档：31.00 31.50 33.50 33.00 34.00 34.5031.210 31.676 33.676 33.252 34.210 34.67630.835 31.376 33.376 32.752 33.835 34.376螺丝攻牙钻孔径和滚丝径对照表 公制挤压丝攻钻孔径 精度等级 规格 G4-G6 M1.0× 0.25 M1.1× 0.25 M1.2× 0.25 M1.4× 0.3 M1.6× 0.35 M1.7× 0.35 M1.8× 0.35 0.86 0.96 1.06 1.24 1.41 1.51 1.61 G7-G8 0.88 0.98 1.08 1.25 1.43 1.53 1.63 － － － － － － － G9 NO.2-56UNC NO.3-48 NO.4-40 NO.5-40 NO.6-32 NO.8-32 NO.10-24 规格（UNC） G4-G6 1.94 2.23 2.50 2.83 3.07 3.73 4.24 G7-G8 － － － － － 3.77 4.3 － － － － － － － G9 美制挤压丝攻钻孔径 精度等级7M2.0× 0.4 M2.2× 0.45 M2.3× 0.4 M2.5× 0.45 M2.6× 0.45 M3.0× 0.5 M3.5× 0.6 M4.0× 0.7 M5.0× 0.8 M6.0× 1.0 M7.0× 1.0 M8.0× 1.25 M10× 1.5 M10× 1.25 M12× 1.75 M12× 1.251.78 1.95 2.08 2.25 2.35 2.73 3.17 3.62 4.56 5.45 6.45 7.31 9.18 9.31 11.04 11.311.80 1.98 2.10 2.28 2.38 2.75 3.20 3.65 4.60 5.50 6.50 7.38 9.25 9.38 11.12 11.38－ － － － － － － 3.69 4.64 5.55 6.55 7.44 9.32 9.44 11.21 11.44NO.12-24 1/4-20 5/16-18 3/8-16 7/16-14 1/2-13 NO.2-64UNF NO.3-56 NO.4-48 NO.5-44 NO.6-40 NO.8-36 NO.10-32 NO.12-28 1/4-28 5/16-24 3/8-24 7/16-20 1/2-204.90 － － － － － 1.97 2.27 2.56 2.86 3.16 3.78 4.39 4.99 5.85 7.36 － － －4.96 5.72 7.24 8.74 10.20 11.27 － － － － － － 4.43 5.04 5.90 7.41 9.00 10.48 12.07－ － － 8.81 10.30 11.82 － － － － － － － － － － － 10.54 12.13签名档：8美制特细螺纹 2 级牙钻孔径 规格 NO.12-32 1/4 -32 标准径 最大 4.70 5.60 7.10 8.70 10.20 11.80 13.20 14.80 17.80 21.00 24.00 4.826 5.690 7.264 8.865 10.338 11.938 13.386 14.986 17.958 21.133 24.308 最小 4.623 5.486 7.087 8.661 10.135 11.709 13.132 14.732 17.678 20.853 24.028 2BA 3BA 4BA 5BA 6BA英制电器螺纹 规格 钻孔径 4.0-4.25/16 -32 3/8 -323.0-3.2 2.7-2.8 2.4-2.57/16 -28 1/2 9/16 5/8 3/4 7/8 1 -28 -24 -24 -20 -20 -20签名档：9螺丝攻牙钻孔径和滚丝径对照表 英制螺纹 钻孔径 规格(UNEF) 硬材 W 1/8 - 40 W 5/32 - 32 W 3/16 - 24 W 1/4 - 20 W 5/16 - 18 W 3/8 - 16 W 7/16 - 14 W 1/2 - 12 W 9/16 - 12 W 5/8 - 11 W 3/4 - 10 W 7/8 - 9 W1 - 8 W 1-1/8 - 7 W 1 - 1/4 - 7 2.65 3.25 3.75 5.10 6.60 8.00 9.40 软材 2.60 3.20 3.70 5.00 6.50 7.90 9.30 M3× 0.5 M3.0× 0.6 M3.5× 0.6 M4.0× 0.7 M4.0× 0.75 M4.5× 0.75 M5.0× 0.8 2.63-2.60 2.56-2.53 3.06-3.03 3.49-3.45 3.45-3.41 3.96-3.92 4.43-4.38 4.36-4.31 5.30-5.25 6.30-6.25 7.28-7.23 7.12-7.07 SM1/8-40 SM1/8-44 SM9/64-40 SM11/64-40 SM3/16-32 SM3/16-28 SM7/32-32 SM15/64-28 SM1/4-40 SM1/4-28 SM9/32-28 SM11/32-28 SM3/8-28 SM7/16-28 SM7/16-1610公制螺纹 规格 滚丝径 规格针车用螺纹 滚丝径 2.735-2.688 2.769-2.722 3.128-3.083 3.855-3.805 4.205-4.155 4.143-4.093 5.003-4.955 5.325-5.570 5.890-5.735 5.721-5.366 6.508-6.648 8.092-8.432 8.880-8.015 10.466-10.401 10.037-9.96710.70 10.50 M5.0× 0.9 12.30 12.00 M6.0× 1.0 13.70 13.50 M7.0× 1.0 16.70 16.50 M8.0× 1.0 19.50 19.30 M8.0× 1.25 22.40 22.00 25.00 24.80 28.30 28.00SM1/2-20 SM9/26-2011.819-11.749 13.400-13.425签名档：英制管螺纹 钻孔径英制管螺纹 标准径 有交 标准 牙部 长度 之长 （最美制管螺纹 钻孔径 NPT标准 规格 径 最大 最小 规格使用 不用 度（最 小）中 绞刀 绞刀 小）中 之毋 时 时 之毋 螺牙 螺牙 内径 内径 时 时 绞刀 绞刀 规格 使用 不用 NPSPS 1/16 6.50 6.632 6.490 28 PS 1/8 8.50 8.637 8.495 28PT 1/16 6.10 6.20 6.244 6.384 1/16 - 27 28 PT 1/8 8.10 8.20 8.249 8.388 1/8 - 27 28 8.33 8.43 8.74 6.10 6.25 6.3511PS 1/4 11.40 11.549 11.341 19 PS 3/8 15.00 15.054 14.846 19 PS 1/2 18.50 18.773 18.489 14 PS 3/4 24.00 24.259 23.975 -14PT 1/4 10.70 11.00 10.962 11.174 1/4 - 18 19 PT 3/8 14.20 14.50 14.448 14.658 3/8 - 18 19 PT 1/2 17.60 18.00 17.979 18.263 1/2 - 14 14 PT 3/4 23.00 23.50 23.378 23.663 3/4 - 14 14 28.58 28.98 29.36 22.63 23.01 23.42 17.48 17.86 18.26 14.27 14.27 14.68 10.72 11.13 11.13PS 1 - 11 30.20 30.471 30.111 PT 1- 11 29.00 29.50 29.459 29.822 1 - 11-1/2 PS 1-1/4 38.80 39.132 38.772 - 11 PS 1-1/2 44.80 45.025 44.665 - 11 - 11 - 11 PT 1-1/2 PT 1-1/437.50 38.00 37.976 38.339 1-1/4-11-1/2 37.31 37.69 38.1043.40 44.00 43.869 44.232 1-1/2-11-1/2 43.66 44.04 44.45PS 2 - 11 56.50 56.836 56.476 PT 2 - 11 54.90 55.50 55.412 55.844 2 - 11 - 1/2 55.58 55.96 56.36 签名档：12英制螺纹螺母孔径 英 制 纹 钻 螺纹直径 （英寸） 每英寸 牙数 头 直 径 螺纹直 （毫米） 径（英 铸铁、 黄 钢、 可锻 寸） 铜、 青铜 铸铁 3/16 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 11/8 11/4 11/2 13/4 2 24 20 18 16 12 11 10 9 8 7 7 6 5 41/2 3.8 5.1 6.6 8 10.6 13.6 16.6 19.5 22.3 25 28.2 34 39.5 45.3 3.9 5.2 6.7 8.1 10.7 13.8 16.8 19.7 22.5 25.2 28.4 34.2 39.7 45.6 1/8 1/4 3/8 1/2 3/4 1 11/4 13/8 11/2 28 19 19 14 14 11 11 11 11 8.8 11.7 15.2 18.9 24.4 30.6 39.2 41.6 45.1 牙数 米） 每英寸 径（毫 钻头直 螺 圆 螺 拄 纹 管13。

公制普通粗牙螺纹螺纹底孔直径
公制细牙螺纹
1919.1M48×1.546.5……
P＜1mm P＞1mm
M20×1.0钻孔深度=所需螺孔深度+0.7d
do=d-（1.04～1.06）P
P-螺距（mm）（1）普通螺纹攻螺纹前底孔的钻头直径
攻不通孔螺纹
攻螺纹前底孔直径的确定
攻米制螺纹式中
do=d-P
do-钻头直径（mm）d-螺纹公称直径（mm)
螺纹公称直径（"） 1/8 1/4 3/8 1/2 3/41 1 1/4 1 3/8 1 1/2每25.4mm 内牙数281919141411111111钻头直径（mm）
8.8
11.7
15.2
18.9
24.4
30.6
39.2
41.3
45.1
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） 1/8288.4 1/8278.6 1/4
1911.2 1/4
1811.1 3/8
1914.7 3/8
1814.5 1/2
1418.3 1/2
1417.9 3/4
1423.6 3/4
1423.211129.71111/229.21 1/4
1138.3
1 1/4
111/237.9
英制锥管螺纹英制锥螺纹（3）英制锥管螺纹和英制锥螺纹攻丝前钻底孔的钻头直径
（2）非螺纹密封的管螺纹攻螺纹前钻底孔的钻头直径。