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1、 螺纹底孔直径 螺纹底孔直径 一、螺纹底孔直径计算式 螺纹底孔直径可参照表 1、表 2 的公式计算，也可查表 3 至表11。表 1 加工米制普通螺纹底孔钻头直径 D 的计算公式 适用范围 1 D=d t 式中 d：螺纹的公称直径 t：螺距（1）螺距 t1；（2）工件材料塑性较大；（3）孔扩张量适中。2 D=d (1.041.08)t（1）螺距 t1；（2）工件材料塑性较小；（3）孔扩张量较小。表 2 加工英制螺纹底孔钻头直径的计算公式(mm)螺纹公称直径(英寸)铸铁与青铜 钢与黄铜 3/16 5/8 D=25.4(d-1/n)D=25.4(d-1/n)+0.13/4 1 1/2 D=25.4(
2、d-1/n)D=25.4(d-1/n)+0.2注：n每英寸牙数 2 二、螺纹底孔直径表 表 3 米制粗牙螺纹攻丝前用的钻头直径(mm)螺 纹 小 直 径 级 别 公称直径 螺距5H max 6H max 7H max 5H、6H、7Hmin 钻头直径1 1.2 1.6 2 2.5 3 4 5 6 8 10 12 14 16 18 20 22 24 0.25 0.25 0.35 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 0.7850.9851.3011.6572.1122.5713.3824.2945.0076.8598.612
3、10.37112.13514.13515.64917.64919.64921.1521.3211.6792.1382.5993.4224.3345.1536.9128.67610.44112.21014.21015.74417.74419.74421.2522.6393.4664.3845.2176.9828.75110.53112.31014.31015.85417.85419.85421.3820.729 0.929 1.221 1.561 2.013 2.459 3.242 4.134 4.917 6.647 8.376 10.106 11.835 13.835 15.294 17.29
4、4 19.294 20.754 0.750.951.251.602.052.503.304.205.006.808.5010.212.014.015.517.519.521.0 3表 4 米制细牙螺纹攻丝前用的钻头直径(mm)螺 纹 小 直 径 级 别 公称直径 螺距 5H max 6H max 7H max 5H、6H、7Hmin 钻头直径2.5 3 0.35 2.201 2.701 2.221 2.721 2.121 2.621 2.152.654 5 0.5 3.571 4.571 3.599 4.599 3.639 4.639 3.459 4.459 3.504.506 8 10 0.
5、75 5.338 7.338 9.338 5.378 7.378 9.378 5.424 7.424 9.424 5.188 7.188 9.188 5.707.209.208 10 12 14 16 18 20 22 24 1 7.107 9.107 11.10713.10715.10717.10719.10721.10723.1077.217 9.217 11.21713.21715.21717.21719.21721.21723.2177.217 9.217 11.21713.21715.21717.21719.21721.21723.2176.917 8.917 10.917 12.9
6、17 14.917 16.917 18.917 20.917 22.917 7.009.0011.013.015.017.019.021.023.010 12 14 1.25 8.859 10.85912.8598.912 10.91212.9128.982 10.98212.9828.647 10.647 12.647 8.8010.812.812 14 15 16 18 20 22 1.5 10.61212.61213.61214.61216.61218.61220.61210.67612.67613.67614.67616.67618.67620.67610.75112.75113.75
7、114.75116.75118.75120.75110.376 12.376 13.376 14.376 16.376 18.376 20.376 10.512.513.514.516.518.520.5 4 螺 纹 小 直 径 级 别 公称直径 螺距 5H max 6H max 7H max 5H、6H、7Hmin 钻头直径24 25 1.5 22.61223.61222.67623.67622.75123.75122.376 23.376 22.523.518 20 22 24 25 2 16.13518.13520.13522.13523.13516.21018.21020.21022.
8、21023.21016.31018.31020.31022.31023.31015.835 17.835 19.835 21.835 22.835 16.018.020.022.023.0表 5 英国标准粗牙惠氏螺纹、攻丝前用的钻头直径(mm)钻 头 直 径 公称直径（英寸）每英寸牙数 铸铁、青铜、黄铜钢、可锻铸铁3/16 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 1 1/8 1 1/4 1 1/2 1 3/4 2 24 20 18 16 12 11 10 9 8 7 7 6 5 4 1/2 3.8 5.1 6.6 8.0 10.6 13.6 16.6 19.6 22.3
9、25.0 28.2 34.0 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 5表 6 英寸制统一粗牙螺纹 UNC 攻丝前用的钻头直径(mm)螺 纹 小 直 径 级 别 公称直径（英寸）每英寸牙 数螺 距2B max 3B max 2B、3Bmin 钻头 直径 No.1 No.2 No.3 No.4 No.5 64 56 48 40 40 0.397 0.454 0.529 0.635 0.635 1.5821.8722.1462.3852.6971.5821.8722.1462.3852.
10、6971.4251.6941.9412.1562.4871.55 1.85 2.10 2.35 2.65 No.6 No.8 No.10 No.12 1/4 32 32 24 24 20 0.794 0.794 1.058 1.058 1.270 2.8963.5313.9624.5975.2682.8963.5283.9504.5905.2502.6423.3023.6834.3434.9762.85 3.50 3.90 4.60 5.10 5/16 3/8 7/16 1/2 9/16 18 16 14 13 12 1.411 1.588 1.814 1.954 2.117 6.7848.1
11、649.55011.01312.4566.6808.0829.44110.88112.3016.4117.8059.14910.58411.9966.60 8.00 9.40 10.80 12.20 5/8 3/4 7/8 1 1 1/8 11 10 9 8 7 2.309 2.540 2.822 3.175 3.629 13.86816.83319.74822.59825.34913.69316.62419.52022.34425.08213.37616.29919.16921.96324.64813.50 16.50 19.50 22.25 25.00 1 1/4 1 3/8 1 1/2
12、1 3/4 2 7 6 6 5 4 1/23.629 4.233 4.233 5.080 5.644 28.52431.12034.29539.81445.59828.25830.85134.02639.56045.36727.82330.34333.51938.95144.68928.00 30.75 34.00 39.50 45.00 6 表 7 英寸制统一细牙螺纹 UNF 攻丝前用的钻头直径(mm)螺 纹 小 直 径 级 别 公称直径（英寸）每英寸牙 数螺 距2B max 3B max 2B、3Bmin 钻头 直径 No.0 No.1 No.2 No.3 No.4 80 72 64 56
13、 48 0.318 0.353 0.397 0.454 0.529 1.3061.6131.9132.1972.4591.3061.6131.9132.1972.4591.1811.4731.7552.0242.2711.25 1.55 1.90 2.15 2.40 No.5 No.6 No.8 No.10 No.12 44 40 36 32 28 0.577 0.635 0.706 0.794 0.907 2.7413.0233.6074.1664.7242.7413.0123.5974.1684.7172.5502.8193.4043.9624.4962.70 2.95 3.50 4.10
14、 4.70 1/4 5/16 3/8 7/16 1/2 28 24 24 20 20 0.907 1.058 1.058 1.270 1.270 5.5807.0388.62610.03011.6185.5636.9958.5659.94711.5245.3676.7928.3799.73811.3265.50 6.90 8.50 9.90 11.50 9/16 5/8 3/4 7/8 1 18 18 16 14 12 1.411 1.411 1.588 1.814 2.117 13.08414.67117.68920.66323.56912.96914.55417.54620.49323.3
15、6312.76114.34817.33020.26223.10912.90 14.50 17.50 20.40 23.25 1 1/8 1 1/4 1 3/8 1 1/2 12 12 12 12 2.117 2.117 2.117 2.117 26.74429.91933.09436.26926.53829.71332.88836.06326.28429.45932.63435.80926.50 29.50 32.75 36.00 7表 8 GB7307-87、ISO228/1-1982 非螺纹密封的管螺纹 攻丝前用的钻头直径(mm)螺 纹 小 直 径 公称直径（英寸）每英寸 牙 数 螺 距
16、max min 钻头 直径 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1 1 1/4 1 1/2 1 3/4 2 28 19 19 14 14 14 14 11 11 11 11 11 0.907 1.337 1.337 1.814 1.814 1.814 1.814 2.309 2.309 2.309 2.309 2.309 8.848 11.890 16.395 19.172 21.128 24.658 28.418 30.931 39.592 45.485 51.428 75.296 8.566 11.445 14.950 18.631 20.587 24.117 27.8
17、77 30.291 38.952 44.845 50.788 56.556 8.80 11.80 15.25 19.00 21.00 24.50 28.25 30.75 39.50 45.00 51.00 57.00 8 表 9 GB7306-87、ISO7/1-1982 用螺纹密封的管螺纹 攻丝前用的钻头直径(mm)螺 纹 小 直 径 公称直径（英寸）每英寸 牙 数 螺 距 max min 钻头 直径 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 28 19 19 14 14 11 11 11 11 0.907 1.337 1.337 1.814 1.814 2.3
18、09 2.309 2.309 2.309 8.637 11.549 15.054 18.773 24.259 30.471 39.132 45.025 56.836 8.495 11.341 14.846 18.489 23.975 30.111 38.772 44.665 56.476 8.60 11.50 15.00 18.50 24.00 30.25 39.00 45.00 56.50 9表 10 美标(NPT、NPSC)管螺纹底孔推荐的麻花钻直径(英寸)锥 螺 纹 公称直径 使用铰刀 不用铰刀 直管螺纹 1 2 3 4 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4
19、1 1/2 2 2 1/2 21/64 27/64 9/16 11/16 57/64 1 1/2 1 15/321 23/322 3/16 2 19/32*0.240*0.328*0.422*0.562*0.688*0.891*1.1251.469 1.719 2.188 2.594 7/16 9/16 45/64 29/32 1 9/64 1 31/641 47/642 13/642 5/8*0.246*0.332*0.438*0.562*0.703*0.906*1.1411.484 1.734 2.203 2.625 1/4 11/32 7/16 37/64 23/32 59/64 1 5
20、/32 1 1/2 1 3/4 2 7/32 2 21/32*0.250*0.344*0.438*0.578*0.719*0.922*1.1561.500 1.750 2.219 2.656 注：*为美国标准麻花钻尺寸 10 表 11 美标(NPTF、NPSI)干密封管螺纹底孔推荐的 麻花钻直径(英寸)锥 螺 纹 公称直径 使用铰刀 不用铰刀 直管螺纹 1 2 3 4 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 21/64 27/64 9/16 11/16 57/64 1 1/8 1 15/321 45/642 3/16 2 19/323
21、7/32*0.234*0.328*0.422*0.562*0.688*0.891*1.1251.469 1.703 2.188 2.594 3.219 7/16 27/64 45/64 59/64 1 5/32 1 1/2 1 47/642 7/32 2 41/643 17/64*0.246*0.339*0.436*0.578*0.703*0.922*1.1561.500 1.734 2.219 2.641 3.266 1/4*11/32 27/64 23/32*59/64 1 5/32*0.250*0.344*0.444*0.578*0.719*0.922*1.156注：*为美国标准麻花钻尺寸