螺纹底径表
螺纹底径表
螺纹底径表螺纹底孔直径一、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1D = d –t式中d：螺纹的公称直径t：螺距（1）螺距t<1；（2）工件材料塑性较大；（3）孔扩张量适中。
2 D = d –(1.04～1 .08)t（1）螺距t<1；（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) + 0.1 3/4 "～1 1/2 " D = 25.4·(d -1/n) D = 25.4·(d -1/n) + 0.2注：n—每英寸牙数(椭圆形注释Hu2010-5-13 14:10:25空白)·2·(椭圆形注释Hu2010-5-13 14:10:42空白)(椭圆形注释Hu2010-5-13 14:10:54空白)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)螺纹钻头直径公称直径螺距小直径级别5H 6H 7H 5H、6H、7Hmax max max min1 0.25 0.785 0.729 0.751.2 0.25 0.985 0.929 0.951.6 0.35 1.301 1.321 1.221 1.252 0.4 1.657 1.679 1.561 1.602.5 0.45 2.112 2.138 2.013 2.053 0.5 2.571 2.599 2.639 2.459 2.504 0.7 3.382 3.422 3.466 3.242 3.305 0.8 4.294 4.334 4.384 4.134 4.206 1 5.007 5.153 5.217 4.917 5.008 1.25 6.859 6.912 6.982 6.647 6.8010 1.5 8.612 8.676 8.751 8.376 8.5012 1.75 10.371 10.441 10.531 10.106 10.214 2 12.135 12.210 12.310 11.835 12.016 2 14.135 14.210 14.310 13.835 14.018 2.5 15.649 15.744 15.854 15.294 15.520 2.5 17.649 17.744 17.854 17.294 17.522 2.5 19.649 19.744 19.854 19.294 19.524 3 21.152 21.252 21.382 20.754 21.0·3·表4米制细牙螺纹攻丝前用的钻头直径(mm)螺纹钻头直径公称直径螺距小直径级别5H 6H 7H 5H、6H、7Hmax max max min2.530.352.2012.7012.2212.7212.1212.6212.152.65450.53.5714.5713.5994.5993.6394.6393.4594.4593.504.506 5.338 5.378 5.424 5.188 5.708 0.75 7.338 7.378 7.424 7.188 7.2010 9.338 9.378 9.424 9.188 9.208 7.107 7.217 7.217 6.917 7.0010 9.107 9.217 9.217 8.917 9.0012 11.107 11.217 11.217 10.917 11.014 13.107 13.217 13.217 12.917 13.016 1 15.107 15.217 15.217 14.917 15.018 17.107 17.217 17.217 16.917 17.020 19.107 19.217 19.217 18.917 19.022 21.107 21.217 21.217 20.917 21.024 23.107 23.217 23.217 22.917 23.010 8.859 8.912 8.982 8.647 8.8012 1.25 10.859 10.912 10.982 10.647 10.8 14 12.859 12.912 12.982 12.647 12.812 10.612 10.676 10.751 10.376 10.514 12.612 12.676 12.751 12.376 12.515 13.612 13.676 13.751 13.376 13.516 1.5 14.612 14.676 14.751 14.376 14.5 18 16.612 16.676 16.751 16.376 16.520 18.612 18.676 18.751 18.376 18.522 20.612 20.676 20.751 20.376 20.5·4·螺纹钻头直径公称直径螺距小直径级别5H 6H 7H 5H、6H、7Hmax max max min24251.522.61223.61222.67623.67622.75123.75122.37623.37622.523.518 16.135 16.210 16.310 15.835 16.0 20 18.135 18.210 18.310 17.835 18.0 22 2 20.135 20.210 20.310 19.835 20.024 22.135 22.210 22.310 21.835 22.025 23.135 23.210 23.310 22.835 23.0表5英国标准粗牙惠氏螺纹Ｂ、Ｓ、Ｗ攻丝前用的钻头直径(mm)公称直径（英寸）每英寸牙数钻头直径铸铁、青铜、黄铜钢、可锻铸铁3/161/45/163/81/25/83/47/81 1/8 1 1/4 1 1/2 1 3/4 224 20 18 16 12 11 10 9877654 1/2 3.85.16.6 8.0 10.6 13.6 16.6 19.6 22.3 25.0 28.2 34.0 39.5 45.3 3.95.26.7 8.1 10.7 13.8 16.8 19.7 22.5 25.234.2 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)螺纹钻头直径公称直径（英寸）每英寸牙数螺距小直径级别2Bmax3Bmax2B、3BminNo.1No.2No.3No.4No.564564840400.3970.4540.5290.6350.6351.5821.8722.1462.3852.6971.5821.8722.1462.3851.425 1.6941.9412.156 2.487 1.551.852.10 2.35 2.65 No.6 No.8 No.10 No.12 1/4 32 32 24 24 20 0.7940.7941.058 1.0581.2702.8963.5313.9624.5975.2682.8963.5283.9504.5905.2502.6423.3023.6834.343 4.9762.853.50 3.905.10 5/16 3/87/16 1/29/16 1816141312 1.411 1.588 1.8141.9542.117 6.7848.1649.55011.01312.456 6.6808.0829.44110.881 12.3016.4117.8059.14910.58411.996 6.608.009.4010.80 12.20 5/83/47/811 1/8 11109872.309 2.5402.8223.175 3.629 13.868 16.833 19.748 22.598 25.349 13.693 16.624 19.520 22.344 25.082 13.376 16.299 19.169 21.963 24.648 13.50 16.50 19.50 22.25 25.00 1 1/4 1 3/8 1 1/2 1 3/4 276654 1/23.6294.2334.2335.080 5.644 28.52431.120 34.295 39.814 45.598 28.258 30.851 34.026 39.560 45.367 27.823 30.343 33.519 38.951 44.689 28.00 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)螺纹钻头直径公称直径（英寸）每英寸牙数螺距小直径级别2Bmax3Bmax2B、3BminNo.0No.1No.2No.3No.480726456480.3180.3530.3970.4540.5291.3061.6131.9132.1972.4591.3061.6131.9132.1971.181 1.4731.7552.024 2.271 1.25 1.551.902.15 2.40No.5 No.6 No.8 No.10 No.12 44 40 36 32 28 0.577 0.635 0.706 0.794 0.9072.7413.0233.6074.166 4.7242.7413.0123.5974.168 4.717 2.5502.8193.404 3.9622.702.953.504.10 4.70 1/45/16 3/87/16 1/2 28242420200.9071.058 1.058 1.270 1.270 5.5807.0388.62610.03011.6185.5636.9958.5659.947 11.5245.3676.7928.3799.738 11.3265.506.908.509.90 11.50 9/16 5/83/411818161412 1.411 1.411 1.5881.8142.11713.08414.671 17.689 20.663 23.569 12.969 14.554 17.546 20.493 23.363 12.761 14.348 17.330 20.262 23.109 12.90 14.50 17.50 20.40 23.25 1 1/8 1 1/4 1 3/8 1 1/2 12121212 2.117 2.117 2.117 2.11726.744 29.919 33.094 36.269 26.538 29.713 32.888 36.063 26.284 29.459 32.634 35.809 26.50 29.50 32.75 36.00·7·表8GB7307-87、ISO228/1-1982非螺纹密封的管螺纹攻丝前用的钻头直径(mm)螺纹钻头直径公称直径（英寸）每英寸牙数螺距小直径max min1/81/43/81/25/83/47/811 1/41 1/21 3/422819191414141411111111110.9071.3371.3371.8141.814 1.8141.8142.309 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 27.877 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9GB7306-87、ISO7/1-1982用螺纹密封的管螺纹攻丝前用的钻头直径(mm)螺纹钻头直径公称直径（英寸）每英寸牙数螺距小直径max min1/81/43/81/23/411 1/41 1/222819191414111111110.9071.3371.3371.8141.8142.3092.3092.3092.3098.63711.549 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)公称直径锥螺纹直管螺纹使用铰刀不用铰刀1 2 3 41/161/81/43/81/23/411 1/41 1/222 1/221/6427/649/1611/1657/641 1/21 15/321 23/322 3/162 19/32*0.240*0.328*0.422*0.562*0.688*0.891*1.1251.4691.7192.1882.5947/169/1645/64 29/32 1 9/64 1 31/641 47/642 13/64 2 5/8 *0.246 *0.332 *0.438 *0.562 *0.703 *0.906 *1.141 1.4841.7342.203 2.625 1/411/327/16 37/64 23/32 59/64 1 5/32 1 1/21 3/42 7/32 2 21/32 *0.250 *0.344 *0.438 *0.578 *0.719 *0.922 *1.156 1.5001.7502.219 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)公称直径锥螺纹直管螺纹使用铰刀不用铰刀1 2 3 41/161/81/43/81/23/411 1/41 1/222 1/2321/6427/649/1611/1657/641 1/81 15/321 45/642 3/162 19/323 7/32*0.234*0.328*0.422*0.562*0.688*0.891*1.1251.4691.7032.1882.5943.2197/1627/6445/6459/641 5/321 1/21 47/642 7/322 41/643 17/64*0.246*0.339*0.436*0.578*0.703*0.922*1.1561.5001.7342.2192.6413.2661/4*11/3227/6423/32*59/641 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。
常用螺纹底孔查询
495TAPS丝锥公制螺纹Metricscrew threadsJIS B 0209-1982（单位：mm）（单位：mm）RECOMMENDED DRILL HOLE SIZE螺纹底孔直径表RECOMMENDED DRILL HOLE SIZE螺纹底孔直径表496螺纹底孔直径表 RECOMMENDED DRILL HOLE SIZER E C O MM E N D E DD R I L LH O L ES I Z E 螺纹底孔直径表公制螺纹Metricscrew threadsJIS B 0209-1982（单位：mm）（单位：mm）497TAPS丝锥RECOMMENDED DRILL HOLE SIZE螺纹底孔直径表R E C O MM E N D E D D R I L L H O L ES I Z E螺纹底孔直径表美制螺纹Unified(单位：mm)(单位：mm)498螺纹底孔直径表 RECOMMENDED DRILL HOLE SIZER E C O MM E N D E D D R I L L H O L ES I Z E 螺纹底孔直径表Screw threads for sewing machines（单位：mm）（单位：mm）Whitworth Coarse screw threads（单位：mm） 级时的最大内径和最小内径嵌合率 ＝ 内螺纹外径的基本尺寸ー底孔尺寸 ×100％ 2×（内螺纹牙山基准高） 2） W ⅛、316在JIS 规章中没有规定，请参考其他尺寸。
499TAPS丝锥RECOMMENDED DRILL HOLE SIZE螺纹底孔直径表R E C O MM E N D E D D R I L L H O L ES I Z E螺纹底孔直径表Taper pipe threads（单位：mm）1. JIS B 0203锥管内螺纹的计算值为，当基准值位于连接部端面时，允许有效螺纹的小端径处存在不完全山形的直孔孔径。
螺纹底孔与攻牙后的孔径对照表
塑性材料钻孔直径D=d(螺纹外径)-p（螺距）
除了以上的经验公司外,还要考虑螺纹的公差等级.
普通公制螺纹用外径-螺距。记这个最直观
螺纹外径计算方法(2009/09/06 19:48)
公制螺纹(MM牙)
牙深=0.6495*牙距P
(牙角60度)
内牙孔径=
M24 Φ21
M27 Φ24
M30 Φ26.5
螺纹钻孔底径计算
一般按下列公式：
1.攻公制螺纹：螺距t<1毫米，dz=d-t
t＞1毫米，dz=d-（1.04～1.06)t
式中t——螺距（毫米）
dz——攻丝前钻孔直径（毫米）
d——螺纹公称直径（毫米）
2.攻英制螺纹：
螺纹公称直径铸铁与青铜钢与黄铜
3/16"～5/8" dz＝25（d-1/n) dz＝25（d-1/n)+0.1
(牙角55度)
PT 3/4-14 (锥度管螺纹)锥度管螺纹,锥度比1/16
3/4英吋管用,每英吋14牙
管螺纹
(PS直螺纹)(PF细牙)
牙深=
0.6403*(25.4/每吋牙数)
(牙角55度)
PS 3/4-14 (直形管螺纹)
PF1 1/8-16 (直形管螺纹)
(细牙)
直形管螺纹
3/4英吋管用,每英吋14牙
3/4"～11/2" dz＝25（d-1/n) dz＝25（d-1/n) +0.2
式中dz——攻丝前钻孔直径（毫米）
d——螺纹公称直径（英寸）
n——每英寸牙数
首先，要知道螺纹的外径D,螺距T,螺纹底孔直径d=D-T。
螺纹底径
6.561 5.566 11.445 14.950 18.631 20.587 24.117 27.877 30.291 34.939 38.952 44.845 50.788 56.656
10.3 10.42 10.25
12.5 12.73 12.43
12.5 12.62 12.37
12.5 12.52 12.31
14.5 14.83 14.49
14.5 14.62 14.37
16.5 16.83 16.49
16.5 16.62 16.37
19.0 19.04 18.58
18.5 18.62 18.37
2級?紋內徑m305m407m508m61m8125m1015m10125m101m12175m1215m12125v142m1415m162m1615m1825m1815m2025m20153142526384105104103125125125145145165165190185210205管用?紋pf稱呼標准徑d1上限d1下限ab級?紋內徑稱呼鑽頭徑d1上限d1下限m8m8m10m10m10m12m12m12m12m14m14m14m16m16m16m18m18m20m201251151251175151251215121511511517447559329449551121113211441155131013321355151015321555173217551932195511301140115011601320134013601520154015601740176019401960山?節距換算表山?每254mm1008807726460節距mmno080unfno172unfno267unfno356unfno448unfno544unfno640unfno836unfno1032unfno1228unf1428unf51624unf3824unf71620unf1220unf91618unf5818unf3416unf7814unf112unf11812unf11412unf13812unf11212unf125155185210240270290350410460550690850990115012901451752052322652953283600254003175035180396904233管用?紋psab級?紋內徑稱呼鑽頭徑d1上限663286371154915054187732425930471391324502556836d1下限649084951134114846184892397530111387724466556476pf11628pf1828pf1419pf3819pf1214pf5814pf3414pf7814pf111pf11811pf11411pf11211pf13411pf211670870117015219021024528230535239245051057068438848189015395191722112824658284183093135579395924
常用公制内外螺纹极限直径表
9.153
8.917
M10x0.75
9.3
9.378
9.188
M10x05
9.5
9.52
9.4
M11X10
10
10.153
9.917
M11x075
10.3
10378
10.188
M11X1.5
10.5
10.676
10.376
M12X1.25
10.8
10.912
10.647
7.391
7.166
7.42
7.46
M8×1
7.974
7.794
7.324
7.212
6.891
7.26
7.29
M10×0.75
9.978
9.838
9.491
9.391
9.166
9.42
9.46
M10×1
9.974
9.794
9.324
9.212
8.891
9.26
9.29
M10×1.25
9.972
9.760
10.91
10.95
M14×1
13.974
13.794
13.324
13.206
12.891
13.25
13.29
M14×1.5
13.968
13.732
12.994
12.854
12.344
12.91
12.95
M16×1
15.974
15.794
15.324
15.206
14.891
15.25
15.29
M16×1.5
螺纹底孔标准
螺纹底孔 加工尺寸(常 用公制细牙)
螺纹尺寸 M10 M10 M10 M12 M12 M12 M14 M14 M15 M16 M16 M20 M20 M20 M24 M24 M24 M25 M25 M27
螺距mm 底孔直径Фmm
1.25 8.75～7.91
1
9～9.15
0.75 9.25～9.37
1.5
25 24.7～25.25
M12×1.25 M14×1.5 M16×1.5 M18×1.5 M20×1.5 M20×2 M22×1.5 M24×1.5 M24×2 M30×1.5
12.5 12.31～12.52 14.5 14.37～14.62 16.5 16.37～16.62 18.5 18.37～18.62 20.5 20.37～20.62 20.5 20.47～20.83 22.5 22.37～22.62 24.5 24.37～24.62 24.5 24.47～24.83 30.5 33.7～30.62
M10
1.5
8.5～8.67
M12
1.75 10.25～10.44
M14
2
12～12.3
M16
2
14～14.3
M18
2.5
15.5～15.7
M20
2.5
17.5～17.84
M22
2.5
19.5～19.84
M24
3
21～21.38
M27
3
24～24.38
M30
3.5
26.5～26.9
螺纹底
孔加工尺
寸(常用
M16×2
M18×2.5
M20×2.5
M22×2.5
M24×3
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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1D = d – t式中 d：螺纹的公称直径t：螺距（1）螺距t<1；（2）工件材料塑性较大；（3）孔扩张量适中。
2 D = d – (1.04～1.08)t （1）螺距t<1；（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) + 0.1 3/4"～1 1/2" D = 25.4·(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5Hmax 6Hmax7Hmax5H、6H、7Hmin钻头直径1 1.2 1.6 2 2.5 34568 10 12 14 16 18 20 22 24 0.250.250.350.40.450.50.70.811.251.51.75222.52.52.530.7850.9851.3011.6572.1122.5713.3824.2945.0076.8598.61210.37112.13514.13515.64917.64919.64921.1521.3211.6792.1382.5993.4224.3345.1536.9128.67610.44112.21014.21015.74417.74419.74421.2522.6393.4664.3845.2176.9828.75110.53112.31014.31015.85417.85419.85421.3820.7290.9291.2211.5612.0132.4593.2424.1344.9176.6478.37610.10611.83513.83515.29417.29419.29420.7540.750.951.251.602.052.503.304.205.006.808.5010.212.014.015.517.519.521.0·3·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 5Hmax 6Hmax7Hmax5H、6H、7Hmin钻头直径2.5 3 0.352.2012.7012.2212.7212.1212.6212.152.654 5 0.53.5714.5713.5994.5993.6394.6393.4594.4593.504.5068 10 0.755.3387.3389.3385.3787.3789.3785.4247.4249.4245.1887.1889.1885.707.209.208 10 12 1416 18 20 22 24 17.1079.10711.10713.10715.10717.10719.10721.10723.1077.2179.21711.21713.21715.21717.21719.21721.21723.2177.2179.21711.21713.21715.21717.21719.21721.21723.2176.9178.91710.91712.91714.91716.91718.91720.91722.9177.009.0011.013.015.017.019.021.023.01012 14 1.258.85910.85912.8598.91210.91212.9128.98210.98212.9828.64710.64712.6478.8010.812.812141516 18 20 22 1.510.61212.61213.61214.61216.61218.61220.61210.67612.67613.67614.67616.67618.67620.67610.75112.75113.75114.75116.75118.75120.75110.37612.37613.37614.37616.37618.37620.37610.512.513.514.516.518.520.5·4·螺 纹小 直 径 级 别公称直径 螺距 5Hmax 6Hmax7Hmax5H、6H、7Hmin钻头直径2425 1.522.61223.61222.67623.67622.75123.75122.37623.37622.523.518 20222425 216.13518.13520.13522.13523.13516.21018.21020.21022.21023.21016.31018.31020.31022.31023.31015.83517.83519.83521.83522.83516.018.020.022.023.0表5 英国标准粗牙惠氏螺纹Ｂ、Ｓ、Ｗ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 1/45/16 3/81/25/83/47/811 1/8 1 1/4 1 1/2 1 3/4 2 242018161211109877654 1/23.85.16.68.010.613.616.619.622.325.028.234.039.545.33.95.26.78.110.713.816.819.722.525.228.434.239.745.6·5·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、3B min 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 1.5821.8722.1462.3852.697 1.5821.8722.1462.3852.697 1.4251.6941.9412.1562.487 1.55 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 2.8963.5313.9624.5975.268 2.8963.5283.9504.5905.250 2.6423.3023.6834.3434.976 2.85 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 6.7848.1649.55011.01312.456 6.6808.0829.44110.88112.301 6.4117.8059.14910.58411.996 6.60 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 1 3/4 2 7 6 6 5 4 1/23.6294.233 4.2335.080 5.64428.52431.12034.29539.81445.59828.25830.85134.02639.56045.36727.82330.34333.51938.95144.68928.00 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、3B min 钻头 直径 No.0 No.1 No.2 No.3 No.4 80 72 64 56 48 0.318 0.353 0.397 0.454 0.529 1.3061.6131.9132.1972.459 1.3061.6131.9132.1972.459 1.1811.4731.7552.0242.271 1.25 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 2.7413.0233.6074.1664.724 2.7413.0123.5974.1684.717 2.5502.8193.4043.9624.496 2.70 2.95 3.50 4.10 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 5.5807.0388.62610.03011.618 5.5636.9958.5659.94711.524 5.3676.7928.3799.73811.326 5.50 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 13.08414.67117.68920.66323.56912.96914.55417.54620.49323.36312.76114.34817.33020.26223.10912.90 14.50 17.50 20.40 23.25 1 1/8 1 1/4 1 3/8 1 1/2 12 12 12 122.117 2.117 2.117 2.11726.74429.91933.09436.26926.53829.71332.88836.06326.28429.45932.63435.80926.50 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 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 11 110.907 1.337 1.337 1.814 1.814 1.814 1.814 2.309 2.309 2.309 2.309 2.3098.848 11.890 16.395 19.172 21.128 24.658 28.418 30.931 39.592 45.485 51.428 75.2968.566 11.445 14.950 18.631 20.587 24.117 27.877 30.291 38.952 44.845 50.788 56.5568.80 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 11 110.907 1.337 1.337 1.814 1.814 2.309 2.309 2.309 2.3098.637 11.549 15.054 18.773 24.259 30.471 39.132 45.025 56.8368.495 11.341 14.846 18.489 23.975 30.111 38.772 44.665 56.4768.60 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 41/161/81/43/81/23/411 1/4 1 1/2 22 1/2 21/6427/649/1611/1657/641 1/21 15/321 23/322 3/162 19/32*0.240*0.328*0.422*0.562*0.688*0.891*1.1251.4691.7192.1882.5947/169/1645/6429/321 9/641 31/641 47/642 13/642 5/8*0.246*0.332*0.438*0.562*0.703*0.906*1.1411.4841.7342.2032.6251/411/327/1637/6423/3259/641 5/321 1/21 3/42 7/322 21/32*0.250*0.344*0.438*0.578*0.719*0.922*1.1561.5001.7502.2192.656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 41/161/81/43/81/23/411 1/4 1 1/2 22 1/23 21/6427/649/1611/1657/641 1/81 15/321 45/642 3/162 19/323 7/32*0.234*0.328*0.422*0.562*0.688*0.891*1.1251.4691.7032.1882.5943.2197/1627/6445/6459/641 5/321 1/21 47/642 7/322 41/643 17/64*0.246*0.339*0.436*0.578*0.703*0.922*1.1561.5001.7342.2192.6413.2661/4*11/3227/6423/32*59/641 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。