公制英制螺纹尺寸速查表
英制,公制螺纹对照表
规格 NO.2 NO.3 NO.4 NO.5 NO.6 NO.8 NO.10 NO.12 1/4 5/16 3/8 7/16 1/2
规格 1/8 5/32 3/16 1/4 5/16 3/8 7/16 1/2
英制螺纺滚造径(韦氏) 外径 滚造径 牙数 最大 最小 最大 最小 40 3.145 3.030 2.72 2.70 32 3.945 3.795 3.40 3.38 24 4.732 4.592 4.03 4.00 20 6.320 6.165 5.48 5.45 18 7.905 7.737 6.97 6.94 16 9.490 9.312 8.44 8.40 14 11.074 10.883 9.88 9.84 12 12.662 12.456 11.27 11.22
外径 最大 最小
滚造径 最大 最小
1.98 1.89 1.70 1.67 2.58 2.48 2.26 2.23 2.98 2.87 2.63 2.60 3.47 3.36 3.06 3.03 3.98 3.84 3.49 3.45 4.47 4.34 3.96 3.92 4.98 4.83 4.43 4.38 5.97 5.82 5.30 5.25 6.97 6.82 6.30 6.25 7.96 7.79 7.12 7.07 8.96 8.79 8.12 8.07 9.96 9.77 8.97 8.91 11.95 11.76 10.79 10.73
公制细牙滚造前后直径
规格
M4 M4.5 M5 M6 M7 M8 M9 MБайду номын сангаас0 M10 M12
牙数
0.50 0.50 0.50 0.75 0.75 1.00 1.00 1.25 1.00 1.25
各国标准螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55º）BSPP英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT美制管螺纹基本尺寸及公差（牙形角60º）UN(F)公制螺纹基本尺寸及公差(牙形角60º) M55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)R4 4"113.032.30911111.551110.0721.479R5 5"138.432.30911136.951135.4721.479R66"163.832.30911162.351160.8721.479聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm 的大口径厚壁卷管，可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域。
公司以良好的信用、优质的产品、雄厚的实力、低廉的价钱享誉全国30多个省、市、自治区、直辖市及国外，产品深得用户依赖。
管螺纹的基本尺寸表(2010-10-25 15:57:35)转载▼标签：杂谈表（1）螺纹基本尺寸G1/2 、ZG1/2 (单位:mm)尺寸代号每25.4mm类的牙数n螺距p 牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径（基准直径）d=D中径d2=D2小径d1=D1锥管螺纹的基本尺寸表（3-28）1/2PT 、1/2NPT 表（2）螺纹基本尺寸 (单位:mm)螺纹标准的一种，按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。
各国标准螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55º）BSPP英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT美制管螺纹基本尺寸及公差（牙形角60º）UN(F)公制螺纹基本尺寸及公差(牙形角60º) M55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)2 R5 5"138.432.30911136.951135.4721.479R66"163.832.30911162.351160.8721.479聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm.壁厚16mm-100mm.外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm 的大口径厚壁卷管.可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管.精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域。
公司以良好的信用、优质的产品、雄厚的实力、低廉的价钱享誉全国30多个省、市、自治区、直辖市及国外.产品深得用户依赖。
管螺纹的基本尺寸表(2010-10-25 15:57:35)转载▼标签：杂谈表（1）螺纹基本尺寸G1/2 、ZG1/2 (单位:mm)尺寸代号每25.4mm类的牙数n螺距p 牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径（基准直径）d=D中径d2=D2小径d1=D11/16 28 0.907 0.581 0.125 7.723 7.142 6.561 4.0 6.5 1/8 28 0.907 0.581 0.125 9.728 9.147 8.566 4.0 6.5 1/4 19 1.337 0.586 0.184 13.157 12.301 11.445 6.0 9.7 3/8 19 1.337 0.586 0.184 16.662 15.806 14.950 6.4 10.1 1/2 14 1.814 1.162 0.249 20.955 19.793 18.631 8.2 13.2锥管螺纹的基本尺寸表（3-28）1/2PT 、1/2NPT表（2）螺纹基本尺寸 (单位:mm)螺纹标准的一种.按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。
最全的公制英制螺纹对照表
(單位：mm) 內螺紋小徑
最小直徑
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 16.307 19.177 21.971 24.638 27.813 30.353 33.528 38.964 44.679
2.221 2.721 3.221 3.599 4.099 4.599 5.099 5.378 6.378 7.153 7.378 8.153 8.378 8.912 9.153 9.378 10.153 10.378 10.676 10.912 11.153 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 20.676 21.153 22.210 22.676 23.153 23.210 23.676 24.153
崁合度區分：中(注1)2級(注2) 下孔徑
2.22 (75%) 2.72 (75%) 3.22 (75%) 3.59 (75%) 4.09 (75%) 4.59 (75%) 5.09 (75%) 5.35 (80%) 6.35 (80%) 7.13 (80%) 7.35 (80%) 8.13 (80%) 8.35 (80%) 8.85 (85%) 9.13 (80%) 9.35 (80%) 10.13 (80%) 10.35 (80%) 10.62 (85%) 10.85 (85%) 11.13 (80%) 12.62 (85%) 13.13 (80%) 13.62 (85%) 14.13 (80%) 14.62 (85%) 15.13 (80%) 15.62 (85%) 16.13 (80%) 16.2 (85%) 16.62 (85%) 17.13 (80%) 18.2 (85%) 18.62 (85%) 19.13 (80%) 20.2 (85%) 20.62 (85%) 21.13 (80%) 22.2 (85%) 22.62 (85%) 23.13 (80%) 23.2 (85%) 23.62 (85%) 24.13 (80%)
英制螺纹尺寸公差表
英制螺纹尺寸公差表单位：毫米规格代号系列代号等级螺距外螺纹内螺纹名义直径每英寸牙数外径中径内径小径中径大径1 0.060—80 （0#—80）UNF2 0.3175 1.5113 –0.08128 1.30556 –0.04572 1.12268 1.1811+0.12446 1.3182 +0.05842 1.5243 0.3175 1.5240 –0.08128 1.3182 –0.03302 1.13538 1.1811 +0.12446 1.3182 +0.04318 1.5242 0.073—64 （1#—64）UNC 2 0.396875 1.83896 –0.09652 1.58242 –0.0508 1.35128 1.42494+0.15748 1.59766 +0.06604 1.8542 3 0.396875 1.8542 –0.09652 1.59766 –0.0381 1.36652 1.42494+0.15748 1.59766 +0.04826 1.85423 0.073—72 （1#—72）UNF 2 0.352777 1.83896 –0.0889 1.61036 –0.04826 1.40716 1.4732 +0.1397 1.6256 +0.0635 1.85423 0.352777 1.8542 –0.0889 1.6256 –0.03556 1.4224 1.4732 +0.1397 1.6256 +0.04826 1.85424 0.086—56 （2#—56）UNC 2 0.453571 2.16916 –0.10414 1.87452 –0.05334 1.6129 1.69418 +0.1778 1.88976 +0.07112 2.18443 0.453571 2.1844 –0.10414 1.88976 –0.04064 1.62814 1.69418 +0.1778 1.88976 +0.05334 2.18445 0.086—64 （2#—64）UNF 2 0.396875 2.16916 –0.09652 1.91262 –0.0508 1.68148 1.75514 +0.15748 1.92786 +0.06858 2.18443 0.396875 2.1844 –0.09652 1.92786 –0.0381 1.69672 1.75514 +0.15748 1.92786 +0.0508 2.18446 0.099—48 （3#—48）UNC 2 0.529166 2.49682 –0.1143 2.15392 –0.05842 1.84658 1.94056 +0.20574 2.1717 +0.07620 2.51463 0.529166 2.5146 –0.1143 2.1717 –0.04318 1.86436 1.94056 +0.20574 2.1717 +0.05588 2.51467 0.099—56 （3#—56）UNF 2 0.453571 2.49682 –0.10414 2.20218 –0.05588 1.94056 2.02438 +0.17272 2.21996 +0.07112 2.51463 0.453571 2.5146 –0.10414 2.21996 –0.04064 1.95834 2.02438 +0.17272 2.21996 +0.05334 2.51468 0.112—40 （4#—40）UNC 2 0.635 2.82448 –0.12954 2.413 –0.0635 2.0447 2.15646 +0.2286 2.43332 +0.08382 2.84483 0.635 2.8448 –0.12954 2.43332 –0.04826 2.06502 2.15646 +0.2286 2.43332 +0.06096 2.84489 0.112—48 （4#—48）UNF 2 0.529166 2.82702 –0.1143 2.48412 –0.06096 2.17678 2.27076 +0.18796 2.5019 +0.07874 2.84483 0.529166 2.8448 –0.1143 2.5019 –0.04572 2.19456 2.27076 +0.18796 2.5019 +0.05842 2.844810 0.125—40 （5#—40）UNC 2 0.635 3.15468 –0.12954 2.7432 –0.06604 2.3749 2.48666 +0.21082 2.76352 +0.08382 3.1753 0.635 3.175 –0.12954 2.76352 –0.04826 2.39522 2.48666 +0.21082 2.76352 +0.0635 3.17511 0.125—44 （5#—44）UNF 2 0.577273 3.15722 –0.12192 2.7813 –0.0635 2.44856 2.55016 +0.1905 2.79908 +0.08128 3.1753 0.577273 3.175 –0.12192 2.79908 –0.04826 2.46634 2.55016 +0.1905 2.79908 +0.06096 3.17512 0.138—32 （6#—32）UNC 2 0.79375 3.48488 –0.1524 2.96926 –0.07112 2.51206 2.6416+0.254 2.98958 +0.09398 3.50523 0.79375 3.5052 –0.1524 2.98958 –0.05334 2.53238 2.6416+0.254 2.98958 +0.06858 3.505213 0.138—40 （6#—40）UNF 2 0.635 3.48488 –0.12954 3.0734 –0.06604 2.7051 2.8194+0.2032 3.09372 +0.08636 3.50523 0.635 3.5052 –0.12954 3.09372 –0.0508 2.72542 2.8194 +0.19304 3.09372 +0.0635 3.5052序号 规格代号系列 代号 等级 螺距 外螺纹 内螺纹 名义直径 每英寸牙数外径 中径 内径 小径 中径 大径 14 0.164—32 （8#—32）UNC 2 0.79375 4.14274 –0.1524 3.62712 –0.07366 3.16992 3.302 +0.2286 3.64998 +0.09652 4.1656 3 0.79375 4.1656 –0.1524 3.64998 –0.05588 3.19278 3.302 +0.22606 3.64998 +0.07112 4.1656 15 0.164—36 （8#—36）UNF 2 0.70555 4.14528 –0.1397 3.68808 –0.07112 3.27914 3.4036 +0.2032 3.7084 +0.09144 4.1656 3 0.70555 4.1656 –0.1397 3.7084 –0.05334 3.29946 3.4036 +0.19304 3.7084 +0.06858 4.1656 16 0.190—24 （10#—24）UNC 2 1.05833 4.8006 –0.18288 4.11226 –0.08382 3.50266 3.683 +0.2794 4.13766 +0.10922 4.826 3 1.05833 4.826 –0.18288 4.13766 –0.0635 3.52806 3.683 +0.2667 4.13766 +0.08128 4.826 17 0.190—32（10#—32）UNF 2 0.79375 4.80314 –0.1524 4.28752 –0.0762 3.83032 3.9624 +0.20324.31038 +0.09906 4.826 3 0.79375 4.826 –0.1524 4.31038 –0.05842 3.85318 3.9624 +0.205744.31038 +0.07366 4.826 18 0.216—24 UNC 2 1.058335.461 –0.18288 4.77266 –0.08636 4.16306 4.3434 +0.2544.79806 +0.111765.4864 3 1.05833 5.4864 –0.18288 4.79806 –0.06604 4.18846 4.3434 +0.246384.79806 +0.83825.4864 19 0.216—28 UNF 2 0.90714 5.461 –0.1651 4.87172 –0.08128 4.34848 4.4958 +0.22864.89712 +0.106685.4864 3 0.90714 5.4864 –0.1651 4.89712 –0.06096 4.37388 4.4958 +0.220984.89712 +0.078745.4864 20 0.216—32 UNEF 2 0.79375 5.46354 –0.1524 4.94792 –0.07874 4.49072 4.6228 +0.20324.97078 +0.104145.4864 3 0.79375 5.4864 –0.1524 4.97078 –0.06096 4.51358 4.6228 +0.19054.97078 +0.078745.4864 21 0.250—20 1/4—20 UNC 1 1.276.32206 –0.30988 5.49656 –0.14224 4.76504 4.9784 +0.27945.5245 +0.185426.35 2 1.27 6.32206 –0.20574 5.49656 –0.09398 4.76504 4.9784 +0.27945.5245 +0.124466.35 3 1.27 6.35 –0.20574 5.5245 –0.07112 4.79298 4.9784 +0.271785.5245 +0.091446.35 22 0.250—28 1/4—28UNF 1 0.90714 6.3246 –0.24892 5.73532 –0.127 5.21208 5.3594 +0.22865.76072 +0.16516.35 2 0.90714 6.3246 –0.1651 5.73532 –0.08382 5.21208 5.3594 +0.22865.76072 +0.109226.35 3 0.90714 6.35 –0.1651 5.76072 –0.0635 5.23748 5.3594 +0.20325.76072 +0.081286.35 23 0.250—32 1/4—32UNEF 2 0.79375 6.3246 –0.1524 5.80898 –0.8128 5.35178 5.4864 +0.20325.83438 +0.106686.35 3 0.79375 6.35 –0.1524 5.83438 –0.6096 5.37718 5.4864 +0.175265.83438 +0.078746.35 24 .3125－18 5/16－18UNC 1 1.411117.90702 –0.33274 6.99008 –0.15494 6.17474 6.4008 +0.33027.02056 +0.200667.9375 2 1.411117.90702 –0.22098 6.99008 –0.1016 6.17474 6.4008 +0.33027.02056 +0.134627.9375 3 1.411117.9375 –0.220987.02056 –0.0762 6.20522 6.4008 +0.27947.02056 +0.099067.9375序号 规格代号系列 代号 等级 螺距 外螺纹 内螺纹 名义直径 每英寸牙数外径 中径 内径 小径 中径 大径 25 .3125—20 5/16—20UN 21.27 7.90702 –0.205747.08152 –0.1016 6.35 6.5532 +0.30487.112 +0.132087.9375 31.27 7.9375 –0.205747.112 –0.0762 6.38048 6.5532 +0.2547.112 +0.099067.9375 26 .3125—24 5/16—24UNF 11.0583337.90956 –0.274327.22122 –0.1397 6.61162 6.7818 +0.2547.24916 +0.180347.9375 21.0583337.90956 –0.182887.22122 –0.09398 6.61162 6.7818 +0.2547.24916 +0.121927.9375 31.0583337.9375 –0.182887.24916 –0.6858 6.63956 6.7818 +0.21336 7.24916 +0.091447.9375 27 .3125—28 5/16—28UN 20.90714 7.9121 –0.16517.32282 –0.8636 6.79958 6.9596 +0.20327.34822 +0.111767.9375 30.90714 7.9375 –0.16517.34822 –0.06604 6.82498 6.9596 +0.17018 7.34822 +0.083827.9375 28 .3125—32 5/16—32UNEF 20.79375 7.9121 –0.15247.39648 –0.08128 6.93928 7.0866 +0.17787.42188 +0.106687.9375 30.79375 7.9375 –0.15247.42188 –0.06096 6.96468 7.0866 +0.14478 7.42188 +0.78747.9375 29 0.375—16 3/8—16 UNC 11.5875 9.49198 –0.360688.46074 –0.1651 7.5438 7.7978 +0.35568.49376 +0.21599.525 21.5875 9.49198 –0.238768.46074 –0.11176 7.5438 7.7978 +0.35568.49376 +0.144789.525 31.5875 9.525 –0.238768.49376 –0.08382 7.57682 7.7978 +0.28448 8.49376 +0.109229.525 30 0.375—20 3/8—20UN 21.27 9.49452 –0.205748.66902 –0.10414 7.9375 8.1534 +0.27948.6995 +0.137169.525 31.27 9.525 –0.205748.6995 –0.07874 7.96798 8.1534 +0.22098 8.6995 +0.10169.525 31 0.375—24 3/8—24UNF 11.0583339.49706 –0.274328.80872 –0.14478 8.19912 8.382 +0.2548.83666 +0.18796 9.525 21.0583339.49706 –0.182888.80872 –0.09652 8.19912 8.382 +0.2548.83666 +0.12466 9.525 31.0583339.525 –0.182888.83666 –0.07366 8.22706 8.382 +0.182888.83666 +0.09398 9.525 32 0.375—28 3/8—28UN 20.90714 9.49706 –0.16518.90778 –0.09144 8.38454 8.5344 +0.22868.93572 +0.116849.525 30.90714 9.525 –0.16518.93572 –0.06858 8.41248 8.5344 +0.16764 8.93572 +0.08899.525 33 0.375—32 3/8—32UNEF 20.79375 9.4996 –0.15248.98398 –0.08636 8.52678 8.6614 +0.20329.00938 +0.111769.525 30.79375 9.525 –0.15249.00938 –0.0635 8.55218 8.6614 +0.14986 9.00938 +0.083829.525 34 0.4375—14 UNC 11.81428611.07694 –0.39379.89838 –0.18034 8.8519 9.144 +0.40649.93394 +0.2336811.1125 2 1.81428611.07694 –0.261629.89838 –0.11938 8.8519 9.144 +0.40649.93394 +0.1549411.1125 3 1.81428611.1125 –0.261629.93394 –0.0889 8.88746 9.144 +0.297189.93394 +0.1168411.1125 35 0.4375—16 UN 2 1.5875 11.07694 –0.2387610.0457 –0.11684 9.12876 9.398 +0.355610.08126 +0.1498611.1125 3 1.5875 11.1125 –0.2387610.08126 –0.08636 9.16432 9.398 +0.25410.08126 +0.114311.1125号 代号 级名义直径 每英寸牙数 外径 中径 内径 小径 中径 大径 36 0.4375—20 UNF 11.27 11.07948 –0.3098810.25398 –0.160029.52246 9.7282 +0.304810.287 +0.2057411.1125 2 1.27 11.07948 –0.2057410.25398 –0.106689.52246 9.7282 +0.304810.287 +0.1371611.1125 3 1.27 11.1125 –0.2057410.287 –0.078749.55548 9.7282 +0.21844 10.287 +0.1041411.1125 37 0.4375—28 UNEF 2 0.90714311.08456 –0.165110.49528 –0.091449.97204 10.1346 +0.203210.52322 +0.1168411.1125 3 0.90714311.1125 –0.165110.52322 –0.068589.99998 10.1346 +0.154910.52322 +0.0889 11.1125 38 0.4375—32 UN 2 0.79375 11.0871 –0.152410.57148 –0.0863610.11248 10.2616 +0.177810.59688 +0.1117611.1125 3 0.79375 11.1125 –0.152410.59688 –0.0635 10.1396810.2616 +0.137210.59688 +0.0838211.1125 39 0.500—13 UNC 1 1.95384612.6619 –0.4140211.3919 –0.1879610.2641410.5918 +0.431811.43 +0.2463812.7 2 1.95384612.6619 –0.2768611.3919 –0.12710.2641410.5918 +0.431811.43 +0.165112.7 3 1.95384612.700 –0.2768611.43 –0.0939810.3022410.5918 +0.289611.43 +0.1219212.7 40 0.500—16 UN 2 1.5875 12.66444 –0.2387611.6332 –0.1193810.7162610.9728 +0.355611.66876 +0.1549412.7 3 1.5875 12.700 –0.2387611.66876 –0.088910.7518210.9728 +0.251511.66876 +0.1168412.7 41 0.500—20 UNF 1 1.27 12.66698 –0.3098811.84148 –0.1625611.10996 11.3284 +0.431811.8745 +0.2133612.7 2 1.27 12.66698 –0.2057411.84148 –0.1092211.10996 11.3284 +0.431811.8745 +0.1422412.7 3 1.27 12.700 –0.2057411.8745 –0.0812811.14298 11.3284 +0.195611.8745 +0.1066812.7 42 0.500—28 UNEF 2 0.90714312.67206 –0.165112.08278 –0.0939811.55954 11.7094 +0.228612.11072 +0.1219212.7 3 0.90714312.700 –0.165112.11072 –0.0711211.58748 11.7094 +0.167612.11072 +0.0914412.7 43 0.500—32 UN 2 0.79375 12.6746 –0.152412.15898 –0.0889 11.70178 11.8364 +0.203212.18438 +0.114312.7 3 0.79375 12.700 –0.152412.18438 –0.0660411.72718 11.8364 +0.149812.18438 +0.0863612.7 44 0.5625—12 UNC 1 2.11666714.24686 –0.4368812.87272 –0.1981211.65098 11.9888 +0.457212.91336 +0.2590814.2875 2 2.11666714.24686 –0.2895612.87272 –0.1320811.65098 11.9888 +0.457212.91336 +0.1727214.2875 3 2.11666714.2875 –0.2895612.91336 –0.0990611.70178 11.9888 +0.312412.91336 +0.1295414.2875 45 0.5625—16 UN 2 1.5875 14.25194 –0.2387613.2207 –0.1193812.3037612.573 +0.355613.25626 +0.1549414.2875 3 1.5875 14.2875 –0.2387613.25626 –0.0889 12.3393212.573 +0.228613.25626 +0.1168414.2875号 代号 级名义直径 每英寸牙数 外径 中径 内径 小径 中径 大径 46 0.5625—18 UNF 11.41111 14.25194 –0.3327413.335 –0.17272 12.5196612.7508 +0.330213.37056 +0.2260614.2875 2 1.41111 14.25194 –0.2209813.335 –0.1143 12.5196612.7508 +0.330213.37056 +0.1498614.2875 3 1.41111 14.2875 –0.2209813.37056 –0.8636 12.5552212.7508 +0.218413.37056 +0.1117614.2875 47 0.5625—20 UN 2 1.27 14.25448 –0.2057413.42898 –0.10668 12.6974612.9032 +0.304813.462 +0.139714.2875 3 1.27 14.2875 –0.2057413.462 –0.08128 12.7304812.9032 +0.208313.462 +0.1041414.2875 48 0.5625—24 UNEF 2 1.05833 14.25702 –0.1828813.56868 –0.09906 12.9590813.1318 +0.25413.59916 +0.1295414.2875 3 1.05833 1402875 –0.1828813.59916 –0.07366 12.9895613.1318 +0.187913.59916 +0.0965214.2875 49 0.5625—28 UN 2 0.90714 14.25956 –0.165113.67028 –0.09398 13.1470413.3096 +0.203213.69822 +0.1168414.2875 3 0.90714 14.2875 –0.165113.69822 –0.07112 13.1749813.3096 +0.154913.69822 +0.0914414.2875 50 0.5625—32 UN 2 0.79375 14.2621 –0.152413.74648 –0.0889 13.2892813.4366 +0.177813.77188 +0.114314.2875 3 0.79375 14.2875 –0.152413.77188 –0.06604 13.3146813.4366 +0.137213.77188 +0.0863614.2875 51 0.625—11 UNC 1 2.30909 15.83436 –0.4622814.33576 –0.21082 13.0022613.3858 +0.482614.3764 +0.2717815.875 2 2.30909 15.83436 –0.3073414.33576 –0.1397 13.0022613.3858 +0.482614.3764 +0.1828815.875 3 2.30909 15.875 –0.3073414.3764 –0.10414 13.0429 13.3858 +0.307314.3764 +0.1371615.875 52 0.625—12 UN 2 2.11666715.83436 –0.2895614.46022 –0.13716 12.9844813.589 +0.457214.50086 +0.1803415.875 3 2.11666715.875 –0.2895614.50086 –0.10414 13.2791213.589 +0.2870214.50086 +0.1346215.875 53 0.625—16 UN 2 1.5875 15.83944 –0.2387614.8082 –0.12192 13.8912614.1478 +0.355614.84376 +0.1574815.875 3 1.5875 15.875 –0.2387614.84376 –0.09144 13.9268214.1478 +0.233714.84376 +0.1168415.875 54 0.625—18 UNF 1 1.41111115.83944 –0.3327414.9225 –0.1778 14.1071614.351 +0.330214.95806 +0.2311415.875 2 1.41111115.83944 –0.2209814.9225 –0.11938 14.1071614.351 +0.330214.95806 +0.152415.875 3 1.41111115.875 –0.2209814.95806 –0.0889 14.1427214.351 +0.203214.95806 +0.114315.875 55 0.625—20 UN 2 1.27 15.84198 –0.2057415.01648 –0.10922 14.2849614.5034 +0.279415.0495 +0.1422415.875 3 1.27 15.875 –0.2057415.0495 –0.08128 14.3179814.5034 +0.195615.0495 +0.1066815.875 56 0.625—24 UNEF 2 1.05833 15.84452 –0.1828815.15618 –0.1016 14.5465814.732 +0.25415.18666 +0.1320815.875 3 1.05833 15.875 –0.1828815.18666 –0.0762 14.5770614.732 +0.1752615.18666 +0.0990615.875序号 规格代号系列 代号 等级 螺距 外螺纹内螺纹 名义直径 每英寸牙数 外径中径 内径 小径 中径 大径 57 0.625—28 UN 2 0.90714315.84706 –0.165115.25778 –0.09652 14.7345414.8844 +0.228615.28572 +0.1244615.875 3 0.90714315.875 –0.165115.28572 –0.0711214.7624814.8844 +0.167615.28572 +0.0939815.875 58 0.625—32 UN 2 0.79375 15.84706 –0.152415.33144 –0.0914414.8742415.0114 +0.203215.35938 +0.1168415.875 3 0.79375 15.875 –0.152415.35938 –0.0685814.9021815.0114 +0.149915.35938 +0.088915.875 59 0.6875—12 UN 2 2.11667 17.42186 –0.2895616.04772 –0.1371614.8259815.1638 +0.457216.08836 +0.1803417.4625 3 2.11667 17.4625 –0.2895616.08836 –0.1041414.8666215.1638 +0.292116.08836 +0.1346217.4625 60 0.6875—16 UN 2 1.5875 17.42694 –0.2387616.3957 –0.12192 15.4787615.748 +0.355616.43126 +0.1574817.4625 3 1.5875 17.4625 –0.2387616.43126 –0.0914415.5143215.748 +0.21336 16.43126 +0.1168417.4625 61 0.6875—20 UN 2 1.27 17.42948 –0.2057416.60398 –0.1092 15.8724616.0782 +0.304816.637 +0.1422417.4625 3 1.27 17.4625 –0.2057416.637 –0.08128 15.9054816.0782 +0.208316.637 +0.1066817.4625 62 0.6875—24 UNEF 2 1.05833317.43202 –0.1828816.74368 –0.1016 16.1340816.3068 +0.25416.77416 +0.1320817.4625 3 1.05833317.4625 –0.1828816.77416 –0.0762 16.1645616.3068 +0.188016.77416 +0.0990617.4625 63 0.6875—28 UN 2 0.90714317.43456 –0.165116.84528 –0.09652 16.3220416.4846 +0.203216.87322 +0.1246617.4625 3 0.90714317.4625 –0.165116.87322 –0.07112 16.3499816.4846 +0.154916.87322 +0.0939817.4625 64 0.6875—32 UN 2 0.79375 17.43456 –0.152416.91894 –0.09144 16.4617416.6116 +0.177816.94688 +0.1168417.4625 3 0.79375 17.4625 –0.152416.94688 –0.06858 16.4896816.6116 +0.137216.94688 +0.088917.4625 65 0.750—10 UNC 1 2.54 19.00428 –0.4927617.35328 –0.22352 15.8877 16.3068 +0.533417.399 +0.292119.05 2 2.54 19.00428 –0.3276617.35328 –0.14986 15.8877 16.3068 +0.533417.399 +0.1955819.05 3 2.54 19.05 –0.3276617.399 –0.11176 15.9334216.3068 +0.317517.399 +0.1447819.05 66 0.750—12 UN 2 2.11666719.00682 –0.2895617.63268 –0.1397 16.4109416.764 +0.457217.67586 +0.1828819.05 3 2.11666719.05 –0.2895617.67586 –0.10414 16.4541216.764 +0.27178 17.67586 +0.1371619.05 67 0.750—16 UNF 1 1.5875 19.0119 –0.3606817.98066 –0.1905 17.0637217.3228 +0.355618.01876 +0.2489219.05 2 1.5875 19.0119 –0.2387617.98066 –0.127 17.0637217.3228 +0.355618.01876 +0.165119.05 3 1.5875 19.05 –0.2387618.01876 –0.09652 17.1018217.3228 +0.223518.01876 +0.1244619.05 68 0.750—20 UNEF 2 1.27 19.01698 –0.2057418.19148 –0.11176 17.4599617.6784 +0.279418.2245 +0.1447819.05 3 1.27 19.05 –0.2057418.2245 –0.08382 17.4929817.6784 +0.195618.2245 +0.1092219.05序号 规格代号系列 代号 等级 螺距 外螺纹内螺纹 名义直径 每英寸牙数 外径中径 内径 小径 中径 大径 69 0.750—28 UN 2 0.90714319.0195 –0.165118.43024 –0.09652 17.907 18.0594 +0.228618.46072 +0.127 19.05 3 0.90714319.05 –0.165118.46072 –0.0736617.9374818.0594 +0.167618.46072 +0.0939819.05 70 0.750—32 UN 2 0.79375 19.02206 –0.152418.50644 –0.0914418.0492418.1864 +0.203218.53438 +0.1193819.05 3 0.79375 19.05 –0.152418.53438 –0.0685818.0771818.1864 +0.149918.53438 +0.0914419.05 71 0.8125—12 UN 2 2.11666720.59432 –0.2895619.22018 –0.1397 17.9984418.3388 +0.457219.26336 +0.1828820.6375 3 2.11666720.6375 –0.2895619.26336 –0.1041418.0416218.3388 +0.276919.26336 +0.1371620.6375 72 0.8125—16 UN 2 1.5875 20.5994 –0.2387619.56816 –0.1244618.6512218.923 +0.355619.60626 +0.1600220.6375 3 1.5875 20.6375 –0.2387619.60626 –0.0914418.6893218.923 +0.21082 19.60626 +0.1193820.6375 73 0.8125—20 UNEF 2 1.27 20.60448 –0.2057419.77898 –0.1117619.0474619.2532 +0.304819.812 +0.1447820.6375 3 1.27 20.6375 –0.2057419.812 –0.8382 19.0804819.2532 +0.208319.812 +0.1092220.6375 74 0.8125—28 UN 2 0.90714320.607 –0.165120.01774 –0.0965219.4945 19.6596 +0.203220.04822 +0.12720.6375 3 0.90714320.6375 –0.165120.04822 –0.0736619.5249819.6596 +0.154920.04822 +0.0939820.6375 75 0.8125—32 UN 2 0.79375 20.60956 –0.152420.09394 –0.0914419.6367419.7866 +0.177820.12188 +0.1193820.6375 3 0.79375 20.6375 –0.152420.12188 –0.0685819.6646819.7866 +0.137220.12188 +0.0914420.6375 76 0.875—9 UNC 1 2.82222222.17674 –0.5283220.34286 –0.2413 18.7147219.177 +0.5842 20.39112 +0.3124222.225 2 2.82222222.17674 –0.3530620.34286 –0.1600218.7147219.177 +0.5842 20.39112 +0.2082822.225 3 2.82222222.225 –0.3530620.39112 –0.1193818.7629819.177 +0.33274 20.39112 +0.1549422.225 77 0.875—12 UN 2 2.11666722.18182 –0.2895620.80768 –0.1397 19.5859419.939 +0.457220.85086 +0.1828822.225 3 2.11666722.225 –0.2895620.85086 –0.10414 19.6291219.939 +0.2590820.85086 +0.1371622.225 78 0.875—14 UNF 1 1.81428622.18436 –0.393721.0058 –0.20574 19.9593220.2692 +0.406421.04644 +0.2692422.225 2 1.81428622.18436 –0.2616221.0058 –0.13716 19.9593220.2692 +0.406421.04644 +0.177822.225 3 1.81428622.225 –0.2616221.04644 –0.10414 19.9999620.2692 +0.223521.04644 +0.1346222.225 79 0.875—16 UN 2 1.5875 22.1869 –0.2387621.15566 –0.12446 20.2387220.4978 +0.355621.19376 +0.1600222.225 3 1.5875 22.225 –0.2387621.19376 –0.09144 20.2768220.4978 +0.223521.19376 +0.1193822.225 80 0.875—20 UNEF 2 1.27 22.19198 –0.2057421.36648 –0.11176 20.6349620.8534 +0.279421.3995 +0.1447822.225 3 1.27 22.225 –0.2057421.3995 –0.08382 20.6679820.8534 +0.195621.3995 +0.1092222.225。
公英制螺纹对照表
英制、公制对照表英寸制统一螺纹，在英寸制国家广泛采用，该类螺纹分三个系列：粗牙系列UNC 细牙系列UNF特细牙系列UNFF外加一个定螺距系列UN 标注方法：螺纹直径一每英寸牙数系列代号一精度等级示例：粗牙系列3/8 —16 UNC-2A 细牙系列3/8 —24 UNF-2A 特细牙系列3/8 —32 UNFF-2A 定螺距系列3/8 —20 UN-2A 第一位数字3/8表示螺纹外径，单位为英寸，转换为米制单位mm要乘以25.4，即3/8 X 25.4=9.525mm第二、三位数字16、24、32、20为每英寸牙数（在25.4mm长度上的牙数）；第三位以后的文字代号UNC UNF UNFF UN为系列代号，最后两位2A为精度等级。
在统一螺纹标准中规定，一个公称尺寸可有不同的螺距，如1/2就有13牙、16牙、20牙、32牙之分，标准规定13牙为粗牙，20牙为细牙，28牙为超细牙；16牙和32牙都称为恒定螺距，与粗牙、细牙没什么不同。
英制螺纹外径公制对照表英制11公制4# 2. 95# 3. 26# 3. 57# 3. 98# 4. 210# 4. 812# 5. 514#/1/4 6. 35 1/8 3. 175 1/4 6. 35 5/16 7. 936 3/8 9. 525 7/16 11. 113 1/2 12. 7 9/16 14. 288 5/8 15. 875 3/4 19. 05 7/8 22. 2251 25. 4 1-1/8 28. 575 1-1/4 31. 75 英制公制1-5/8 41. 2751-3/4 44. 451-7/8 47. 6252 50. 82-1/8 53. 9752-1/4 57. 152-3/8 60. 3252-1/2 63. 52-5/8 66. 6752-3/4 69. 852-7/8 73. 0253 76. 23-1/8 79. 3753-1/4 82. 553-3/8 85. 7253-1/2 88. 93-5/8 92. 0253-3/4 95.253-7/8 98.1254 101.64-1/4 107.95英制公制4-5/8 117.4754-3/4 120.654-7/8 123.8255 1275-1/4 133.355-3/8 136.5255-1/2 139.75-5/8 142.8755-3/4 146.055-7/8 149.2256 152.46-1/4 158.756-3/8 161.9256-1/2 168.2756-5/8 171.456-3/4 174.6256-7/8 177.87 184.157-1/4 187.3257-3/8 190.57-1/2 193.675央美联 关合公制规格底孔①规格底孔①1-64UNC 1.55 M1.0*0.25 0.75 2-56UNC 1.8 M1.1*0.25 0.85 3-48UNC 2.1 M1.2*0.25 0.95 4-40UNC 2.3M1.4*0.3 1.1 5-40UNC 2.6M1.6*0.35 1.25 6-32UNC 2.8 M1.7*0.35 1.35 8-32UNC 3.4 M1.8*0.35 1.45 10-32UNC 4.1 M2.0*0.4 1.6 10-24UNC 3.9 M2.2*0.45 1.75 12-24UNC 4.5 M2.3*0.4 1.9 1\4-20UNC 5.1 M2.5*0.45 2.1 5\16-18u nc 6.6 M2.6*0.45 2.2 3\8-16UNC 8 M3.0*0.5 2.5 7\16-14UNC 9.4 M3.0*0.6 2.4 1\2-13UNC 10.8 M3.5*0.6 2.9 9\16-12UNC 12.2 M4.0*0.7 3.3 5\8-11UNC 13.6 M4.0*0.75 3.25 3\4-10UNC 16.5 M4.5*0.7 3.8 7\8-9UNC 19.5 M5*0.8 4.2 1--8UNC 22.2 M5*0.9 4.1 11\8-7UNC 25 M6*1.0 5 11\4-7UNC 28.2 M7*1.0 6 13\8-6UNC 30.8 M8*1.25 6.8 11\2-6UNC 34 M9*1.25 7.8 13\4-5UNC 39.5 M10*1.5 8.5 2-41\2UNC45.2M11*1.5 9.5 英美联合螺纹螺距根据每一 英寸长度上拥有的牙数来计算外径根据螺纹牌号的第一个 代号来计算（4#，5#，6#，7#，8#， 10#- 12#为特殊外径详见表1）M12*1.75 10.3 M14*2.0 12 M16*2.0 14 M18*2.5 15 M20*2.5 17 7 / ▼ .M22*2.519 1/4*25.4=6.35 （螺纹外径）M24*3.0211-3/8 1-1/2I 34. 925 I I 4-3/8 | I 38. 1 II 4-1/2 I 111.125 114.37-5/8 196.85 7-3/4200.025螺纹电极外径，螺距参照表例：1/4-20 UNC1/4*25.4=6.35 （螺纹外径）25.4/20=1.27 （螺距）阴影部为英制和公制粗牙常用螺纹。
(完整版)螺纹基本尺寸对照表(最新整理)
英制管螺纹基本尺寸及公差（牙形角55º）BSPP基本直径内螺纹外螺纹A级B级螺纹代号大径中径小径中径公差小径公差中径公差大径公差中径公差大径公差G1/8″×289.7289.1478.566+0.170+0.282-0.107-0.214-0.214-0.214G1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8″×1916.66215.80614.950+0.125+0.445-0.125-0.250-0.250-0.250G1/2″×1420.95519.79318.631+0.142+0.541-0.142-0.284-0.284-0.284G5/8″×1422.91121.74920.587+0.142+0.541-0.142-0.284-0.284-0.284G3/4″×1426.44125.27924.117+0.142+0.541-0.142-0.284-0.284-0.284G1″×1133.24931.77030.291+0.180+0.640-0.180-0.360-0.360-0.360G1.1/4″×1141.91040.43138.952+0.180+0.640-0.180-0.360-0.360-0.360G1.1/2″×1147.80346.32444.854+0.180+0.640-0.180-0.360-0.360-0.360G2″×1159.61458.13556.656+0.180+0.640-0.180-0.360-0.360-0.360G2.1/2”X1175.18473.70572.226+0.217+0.640-0.217-0.434-0.434-0.434G3”X1187.88486.40584.926+0.217+0.640-0.217-0.434-0.434-0.434G3.1/2”X11100.33098.85197.372+0.217+0.640-0.217-0.434-0.434-0.434英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT基面上的直径基准长度有效螺纹长度螺纹代号大径中径小径基本最大最小基本最大最小圆锥内螺纹基面轴向位移偏差（±mm）R1/8″×289.7289.1478.566 4.0 4.9 3.1 6.57.4 5.6 1.1 R1/4″×1913.15712.30111.445 6.07.3 4.79.711.08.4 1.7 R3/8″×1916.66215.80614.950 6.47.7 5.110.111.48.8 1.7 R1/2″×1420.95519.79318.6318.210.0 6.413.215.011.4 2.3 R3/4″×1426.44125.27924.1179.511.37.714.516.312.7 2.3 R1″×1133.24931.77030.29110.412.78.116.819.114.5 2.9 R1.1/4″×1141.91040.43138.95212.715.010.419.121.416.8 2.9 R1.1/2″×1147.80346.32444.84512.715.010.419.121.416.8 2.9 R2″×1159.61458.13556.65615.918.213.623.425.721.1 2.9 R2.1/2”X1175.18473.70572.22617.521.014.026.730.223.2 3.5 R3”X1187.88486.40584.92620.624.117.129.833.326.3 3.5R3.1/2”X11100.33098.85197.37222.225.718.731.434.927.9 3.5美制管螺纹基本尺寸及公差（牙形角60º）UN(F)外螺纹内螺纹公差等级公差等级2A2B 螺纹代号大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC螺纹7/16″×20UNF11.07910.87410.25410.1479.5689.72810.03310.28710.42411.113 1/2″×20UNF12.66712.46111.84111.73211.15611.32811.60811.87512.01712.7 9/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.288 3/4″×16UNF19.01218.77317.98117.85417.1217.32317.67818.01918.18419.05 7/8″×14UNF22.18421.92321.00620.86920.02520.26920.67621.04621.22422.225 1-1/16″×12UN26.94426.65525.5725.42524.42524.68925.14625.61325.80126.988 1-5/16″×12UN33.29433.00531.9231.77330.77531.03931.49631.96332.15433.338 1-5/8″×12UN41.22940.9439.88539.70538.7138.98939.44639.90140.09441.275 1-7/8″×12UN47.57947.2946.20546.05345.0645.33945.79646.25146.44947.625 2-1/2″×12UN63.45263.16262.07861.9260.93261.21461.67162.12662.33263.5ORFS螺纹9/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.288 11/16″×16UN17.42717.18816.39616.27415.53515.74816.10416.43116.58917.463 13/16″×16UN20.59920.36119.56819.44418.70718.92319.27919.60619.76620.638 1″×14UNF25.35725.09524.17824.03623.19523.44423.82524.22124.40725.4 1-3/16″×12UN30.11929.8328.74528.59827.627.86428.32128.78828.97930.163 1-7/16″×12UN36.46736.17735.09334.94333.94734.21434.67135.13835.33136.513 1-11/16″×12UN42.81742.52741.44341.2940.29740.56441.02141.48841.68642.863 2″×12UN50.75450.46549.3849.22548.23548.51448.97149.42649.62750.8SAE螺纹5/8″×18UNF15.83915.61814.92314.80314.16114.35114.68114.95815.1115.875 1-1/16″×14UN26.94726.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺纹9/16″×16UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.288 7/8″×12UN22.18221.89220.80820.66819.66219.93920.39620.85121.03422.225 2-1/4″×12UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注：UNC粗牙螺纹系列，UNF细牙螺纹系列，UNEF超细牙螺纹系列，UN不变螺距系列布锥管螺纹基本尺寸及公差(牙形角60º) NPT基面上的直径螺纹长度螺纹代号大径中径小径有效长度管端至基面长Z1/8″×2710.2729.5198.7667 4.572 Z1/4″×1813.57212.44311.3149.5 5.080 Z3/8″×1817.05515.92614.79710.5 6.096 Z1/2″×1421.22319.77218.32113.58.028 Z3/4″×1426.56825.11723.666148.611 Z1″×11.533.22831.46129.69417.510.160Z1.1/4″×11.541.98540.21838.4511810.688Z1.1/2″×11.548.05446.28744.52018.510.688Z2″×11.560.09258.32556.5581911.074公制螺纹基本尺寸及公差(牙形角60º) M基本直径内 螺 纹外螺纹公 差 等 级公差等级6H7H6g螺纹代号大 径中 径小 径中径公差小径公差中径公差小径公差中径公差大径公差M10X1109.3508.917+0.1500+0.2360+0.1900+0.3000-0.026-0.138-0.026-0.206M12X11211.35010.917+0.1600+0.2360+0.2000+0.3000-0.026-0.144-0.026-0.206M14X11413.35012.917+0.1600+0.2360+0.2000+0.3000-0.026-0.144-0.026-0.206M12X1.251211.18810.647+0.1800+0.2650+0.2240+0.3350-0.028-0.160-0.028-0.240M14X1.251413.18812.647+0.1800+0.2650+0.2240+0.3350-0.028-0.160-0.028-0.240M12X1.51211.02610.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M14X1.51413.02612.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M16X1.51615.02614.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M18X1.51817.02616.373+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M20X1.52019.02618.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M22X1.52221.02620.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M24X1.52423.02622.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M26X1.52625.02624.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M27X1.52726.02625.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M30X1.53029.02628.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M33X1.53332.02631.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M36X1.53635.02634.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M39X1.53938.02637.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M42X1.54241.02640.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M27X22725.70124.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M30X23028.70127.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M33X23331.70130.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M36X23634.70133.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M39X23937.70136.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M42X24240.70139.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M45X24543.70142.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M52X25250.70149.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318M60X26058.70157.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318M64X26462.70161.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318M72X27270.70169.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318。
螺纹规格-美制、英制、公制对照表
螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.3052 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.2793 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.3304 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.3565 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.4066 11/16-12 26.944 26.655 0.290 24.689 25.146 0.4577 15/16-12 33.294 33.005 0.290 31.039 31.496 0.4578 15/8-12 41.229 40.940 0.290 38.989 39.446 0.4579 17/8-12 47.579 47.290 0.290 45.339 45.796 0.45710 21/2-12 63.452 63.162 0.290 61.214 61.671 0.457公制细牙6g外螺纹大径6H内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.2402 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.3003 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.3004 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.3005 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.3006 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.3007 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.3008 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.3009 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.30010 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.30011 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.30012 M27*2 26.962 26.682 0.280 24.835 25.210 0.37513 M30*2 29.962 29.682 0.280 27.835 28.210 0.37514 M33*2 32.962 32.682 0.280 30.835 31.210 0.37515 M36*2 35.962 35.682 0.280 33.835 34.210 0.37516 M42*2 41.962 41.682 0.280 39.835 40.210 0.375英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.2822 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.4453 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.4454 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.5415 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.5416 G1-11 33.249 32.889 0.360 30.291 30.931 0.6407 G11/4-11 41.910 41.550 0.360 38.952 39.592 0.6408 G11/2-11 47.803 47.443 0.360 44.845 45.485 0.640 公制/美制/英制螺纹对照表给大家分享一下f a NpX?,A型美制螺纹（UNF）常用规格-,!3 ,oiq外螺纹内螺纹 UX x^Y2-4 9/16"-19牙 14.28 13.08 8-j,M4D*&-6 11/16''-16 17.46 16.1 {lh szc-8 13/16''-16 20.64 19.28 cM iO|N@1-10 1''-14 25.40 23.57 h |t B-12 1(3/16)''-12 30.00 28.32 )Al{84<(}-16 1(7/16)''-12 36.51 34.67 Ys$3}LA{-20 1(11/16)''-12 42.86 41.02 SW 7V7 S*Qz{A h02V@C型JIC37度美制UNF螺纹常用规格(" G'W CLz-4 7/16”-20 11.11 10.03 -e~ xb Qr-5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 NH'YgL6*-8 3/4”-16 19.00 17.68 lxv;6S!J-10 7/8”-14 22.22 20.68 P |J &?KbC-12 1(1/16)"-12 26.98 25.15 Ki; ++-16 1(5/16)"-12 33.33 31.5 ZF !Bk Z U o-20 1(5/8)"-12 41.28 39.44 LX+c Z-24 1(7/8)"-12 47.62 45.8 iDP @c g-32 2(1/2)"-12 63.5 61.67j/5 1 j@^L\e w;h4 y英制圆柱管螺纹（BSPP）常用规格dApg z U@ ;-4 1/4”-19 13.157 11.55 |,hu r8BE\-6 3/8”-19 16.662 14.95 @"%@;>W<t-8 1/2”-14 20.955 18.63 F )$7 ?')p-12 3/4”-14 26.441 24.11 Q} &f3?-16 1”-11 33.249 30.29 YZ @pwhZ<-20 1(1/4)''-11 41.91 38.95 SmU'a o.\<v{UpdB" ]5英制圆锥管螺纹（BSPT）常用规格b sDc <lI基面大径基准距离A4<q_07#1/4”-19 13.157 6 }@E K'k3/8”-19 16.662 6.4 .gy5/-.SZ1/2”-14 20.955 8.2 R0?/' gt3/4”-14 26.441 9.5 aF4L{ 'qK1”-11 33.249 10.4 Q,Y do1(1/4)''-11 41.91 12.7 i '9m o0bmO@;ir e_^C X "TaT"(1 G # 美制圆锥管螺纹（NPT） 9 mJ f1/8”-27 10.24 4 3 x VYo $g 1/4”-18 13.60 4 L8 |v?J 3/8”-18 17.04 4.32D[-ijs3/4”-14 26.57 4.75 GIry1(1/4)”-11.5 41.96 4.83。
公制螺纹英制螺纹规格一览表
公制螺纹/英制螺纹规格一览表公制、美制和英制螺纹标准NPT，PT，G 都是管螺纹．NPT 是National (A merican) Pipe Thread 的缩写，属於美国标准的60 度锥管螺纹，用於北美地区．国家标准可查阅GB/T12716-1991 PT 是Pipe Thread 的缩写，是55 度密封圆锥管螺纹，属惠氏螺纹家族，多用於欧洲及英联邦国家．常用於水及煤气管行业，锥度规定为1:16．国家标准可查阅GB/T7306-2000 G 是55 度非螺纹密封管螺纹，属惠氏螺纹家族．标记为G 代表圆柱螺纹．国家标准可查阅GB/T7307-2001 另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英吋．行内人通常用分来称呼螺纹尺寸，一吋等於8分，1/4 吋就是2分，如此类推．G 好像就是管螺纹的统称(Guan)，55，60度的划分属于功能性的，俗称管圆。
即螺纹由一圆柱面加工而成。
ZG俗称管锥，即螺纹由一圆锥面加工而成，一般的水管接头都是这样的，老国标标注为Rc ------------------------------------------------------ 公制螺纹用螺距来表示，美英制螺纹用每英寸内的螺纹牙数来表示，这是它们最大的区别，公制螺纹是60度等边牙型，英制螺纹是等腰55度牙型，美制螺纹60度。
公制螺纹用公制单位，美英制螺纹用英制单位。
管螺纹主要用来进行管道的连接，其内外螺纹的配合紧密，有直管与锥管两种。
公称直径是指所连接的管道直径，显然螺纹大径比公称直径大。
1/4，1/2，1/8是英《公制、美制和英制螺纹标准手册》主编：李晓滨，386页，中国标准出版社，2004 本手册具有以下几个特点：①弥补了国内目前缺少汉语版的英制和美制螺纹标准的急需；②本书是按国内技术人员熟悉的螺纹技术体系编写，易于理解及找出英制和美制螺纹与米制螺纹间的差异；③技术内容准确；④螺纹种类齐全，它包含了紧固螺纹、传动螺纹和管螺纹三大类的常用螺纹；⑤附录系统地介绍了各种量具与螺纹要素之间的对应关系，提出了螺纹检测体系概念，为国内技术人员迅速提高螺纹产品质量提供了捷径；⑥附录还提供了世界螺纹识别表，解决了国外螺纹识别困难问题；⑦本书为国内第一本全面、详细地介绍英制、美制和米制螺纹的技术手册。
公制螺纹英制螺纹规格一览表
公制螺纹/英制螺纹规格一览表发布时间：10-06-21 来源：点击量：5424 字段选择：大中小2009-10-9外螺纹大径（单位mm）－－－－－－－－－－－－－－－－-内螺纹小径（单位mm）－－－－－－－－－－－－－－－－-序号规格型号最大最小公差最大最小公差1M10*19.9749.7940.1809.1578.9170.240 2M12*1.511.96811.7320.23610.67610.3760.300 3M14*1.513.96813.7320.23612.67612.3760.300 4M16*1.515.96815.7320.23614.67614.3760.300 5M18*1.517.96817.7320.23616.67616.3760.300 6M20*1.519.96819.7320.23618.67618.3760.300 7M22*1.521.96821.7320.23620.67620.3760.300 8M24*1.523.96823.7320.23622.67622.3760.300 9M26*1.525.96825.7320.23624.67624.3760.300 10M27*1.526.96826.7320.23625.67625.3760.300 11M30*1.529.96829.7320.23628.67628.3760.300 12M27*226.96226.6820.28025.21024.8350.375 13M30*229.96229.6820.28028.21027.8350.375 14M33*232.96232.6820.28031.21030.8350.375 15M36*235.96235.6820.28034.21033.8350.375 16M42*241.96241.6820.28040.21039.8350.375英制螺纹规格一览表外螺纹大径（单位mm）内螺纹小径（单位mm）序号规格型号最大最小公差最大最小公差1G1/8-289.7289.5140.2148.8488.5660.282 2G1/4-1913.15712.9070.25011.89011.4450.445 3G3/8-1916.66216.4120.25015.39514.9500.445 4G1/2-1420.95520.6710.28419.17218.6310.541 5G3/4-1426.44126.1570.28424.65824.1170.541 6G1-1133.24932.8890.36030.93130.2910.640 7G11/4-1141.91041.5500.36039.59238.9520.640 8G11/2-1147.80347.4430.36045.48544.8450.640类别标准名称标准号普通螺纹普通螺纹基本牙型GB/T192 —1981普通螺纹直径与螺距系列GB/T193 —1981普通螺纹基本尺寸GB/T196 —1981普通螺纹公差与配合GB/T197 —1981普通螺纹偏差表GB/T2516 —1981商品紧固件的普通螺纹选用系列JB/T7912 —1999商品紧固件的中等精度普通螺纹极限尺寸GB/T9145 —1988光学螺纹光学仪器特种细牙螺纹ZBN30006—1988光学仪器用目镜螺纹JB/T8204—1995光学仪器用短牙螺纹JB/T5450-1991紧配合螺纹过渡配合螺纹GB/T1167—1996过盈配合螺纹GB/T1181—1998小螺纹小螺纹牙型GB/T1505 4.1—1994 小螺纹直径与螺距系列GB/T1505 4.2—1994小螺纹基本尺寸GB/T1505 4.3—1994小螺纹公差GB/T15054.4-1994小螺纹极限尺寸GB/T15054.5-1994MJ螺纹MJ螺纹基本牙型GJB/T3.1 —1982 MJ螺纹螺栓与螺母螺纹的尺寸与公差GJB/T3.2 —1982MJ螺纹管路件螺纹的尺寸与公差GJB/T3.3 —1985MJ螺纹结构件的尺寸与公差GJB/T3.4 —1985MJ螺纹计算公式GJB/T3.5 —1985MJ螺纹首尾GJB52-1985梯形螺纹梯形螺纹牙型GB/T5796 .1—1986 梯形螺纹直径与螺距系列GB/T5796 .2—1986梯形螺纹基本尺寸GB/T5796 .3—1986梯形螺纹公差GB/T5796 .4—1986梯形螺纹极限尺寸GB/T12359—1990机床梯形螺纹丝杠、螺母技术条件JB/T2886—1992锻钢阀门用短牙梯形螺纹JB/TQ374—1985锯齿形螺纹锯齿形(3 °、30°)螺纹牙型GB/T13576.1—1992锯齿形(3 °、30°)螺纹直径与螺距系列GB/T13576.2—1992锯齿形(3 °、30°)螺纹基本尺寸GB/T13576.3—1992锯齿形(3 °、30°)螺纹公差GB/T13576.4—1992水压机45 °锯齿形螺纹牙型与基本尺寸JB2076—1984管螺纹用螺纹密封的管螺纹GB/T7306 —1987 非螺纹密封的管螺纹GB/T7307 —198760°圆锥管螺纹GB/T12716—1991米制锥螺纹GB/T1415—1992管路旋入端用普通螺纹尺寸系列GB/T1414—1978气瓶专用螺纹GB/T8335-1998通用基准螺纹术语GB/T1479 1—1993公制粗螺纹标准公制细螺纹标准规格标准径最大最小规格标准径最大最小规格标准径最大最小M1.0*0.25 0.75 0.785 0.729 M1.0*0.2 0.8 0.821 0.783 M15*1.0 14 14.353 13.917 M1.1*0.25 0.85 0.885 0.829 M1.1*0.2 0.9 0.921 0.883 M16*1.5 14.5 14.676 14.376 M1.2*0.25 0.95 0.985 0.929 M1.2*0.2 1 1.021 0.983 M16*1.0 15 15.153 14.917 M1.4*0.3 1.1 1.142 1.075 M1.4*0.2 1.2 1.221 1.183 M17*1.5 15.5 15.676 15.376 M1.6*0.35 1.25 1.321 1.221 M1.6*0.2 1.4 1.421 1.383 M17*1.0 16 16.153 15.917 M1.7*0.35 1.35 1.421 1.321 M1.7*0.2 1.45 1.5 1.46 M18*2.0 16 16.21 15.835 M1.8*0.35 1.45 1.521 1.421 M1.8*0.2 1.6 1.621 1.583 M18*1.5 16.5 16.676 16.376 M2.0*0.4 1.6 1.679 1.567 M2.0*0.25 1.75 1.785 1.729 M18*1.0 17 17.153 16.917 M2.2*0.45 1.75 1.888 1.713 M2.2*0.25 1.95 1.985 1.929 M20*2.0 18 18.21 17.835 M2.3*0.4 1.9 1.979 1.867 M2.3*0.25 2.05 2.061 2.001 M20*1.5 18.5 18.676 18.376 M2.5*0.45 2.1 2.138 2.013 M2.5*0.35 2.2 2.221 2.121 M20*1.0 19 19.153 18.917 M2.6*0.45 2.2 2.238 2.113 M2.5*0.35 2.2 2.246 2.186 M22*2.0 20 20.21 19.835 M3.0*0.5 2.5 2.599 2.459 M3.0*0.35 2.7 2.721 2.621 M22*1.5 20.5 20.676 20.376 M3.0*0.6 2.4 2.44 2.28 M3.5*0.35 3.2 3.221 3.121 22*1.0 21 21.153 20.917 M3.5*0.6 2.9 3.01 2.85 M4.0*0.5 3.5 3.599 3.459 M24*2.0 22 22.21 21.835 M4.0*0.7 3.8 3.422 3.242 M4.5*0.5 4 4.099 3.959 M24*1.5 22.5 22.676 22.376M4.0*0.75 3.25 3.326 3.106 M5.0*0.5 4.5 4.599 4.459 M24*1.0 23 23.153 22.917 M4.5*0.7 3.8 3.878 3.688 M5.5*0.5 5 5.099 4.959 M25*2.0 23 23.21 22.835 M5*0.8 4.2 4.334 4.134 M6.0*0.75 5.3 5.378 5.188 M25*1.5 23.5 23.676 23.376 M5*0.9 4.1 4.17 3.98 M6.0*0.5 5.5 5.55 5.4 M25*1.0 24 24.153 23.917 M6*1.0 5 5.153 4.917 M7.0*0.75 6.3 6.378 6.188 M26*1.5 24.5 24.676 24.876 M7*1.0 6 6.153 5.917 M7.0*0.5 6.5 6.55 6.4 M27*2.0 25 25.21 24.735 M8*1.25 6.8 6.912 6.647 M8.0*1 7 7.153 6.917 M27*1.5 25.5 25.676 25.376 M9*1.25 7.8 7.912 7.647 M8.0*0.75 7.3 7.378 7.188 M27*1.0 26 26.153 25.735 M10*1.5 8.5 8.676 8.376 M8.0*0.5 7.5 7.52 7.4 M28*2.0 26 26.21 25.835 M11*1.5 9.5 9.676 9.376 M9.0*1 8 8.153 7.917 M28*1.5 26 26.676 26.376 M12*1.75 10.3 10.24 10.11 M9.0*0.75 8.3 8.378 8.188 M28*1.0 27 27.153 26.917 M14*2.0 12 12.21 11.84 M10*1.25 8.8 8.912 8.647 M30*3.0 27 27.252 26.752 M16*2.0 14 14.21 13.84 M10*1.0 9 9.153 8.917 M30*2.0 28 28.21 27.835 M18*2.5 15.5 15.744 15.29 M10*0.75 9.3 9.378 9.188 M30*1.0 28 28.676 28.376 M20*2.5 17.5 17.744 17.29 M10*0.5 9.5 9.52 9.4 M32*2.0 30 29.153 28.917 M22*2.5 19.5 19.744 19.29 M11*1.0 10 10.15 9.917 M32*1.5 30 30.21 29.835 M24*3.0 21 21.252 20.75 M11*0.75 10.3 10.38 10.19 M33*3.0 30 30.676 30.376 M27*3.0 24 24.252 23.75 M12*1.5 10.5 10.68 10.38 M33*2.0 31 30.252 29.752 M30*3.5 26.5 26.771 26.21 M12*1.25 10.8 10.91 10.65 M33*1.5 31.5 31.21 30.835M12*1 11 11.15 10.92 M35*1.5 33.5 33.676 31.376M12*0.5 11.5 11.52 11.4 M36*3.0 33 33.252 32.752M14*0.5 12.5 12.68 12.38 M36*2.0 34 34.21 33.835M14*1.0 13 13.15 12.92 M36*1.5 34 34.676 34.376M15*1.50 13.5 13.68 13.38美制细螺纹标准公制迫牙丝攻钻孔径规格(丝牙外径）标准径最大最小规格精度等级7－G8 1.25 1.305 1.182 G4－G6 G7－G8 G9 NO.1-72(1.854) 1.55 1.612 1.474 M1.0*0.25 0.86 0.88 NO.2-64(2.134) 1.85 1.912 1.756 M1.1*0.25 0.96 0.98 NO.3-56(2.515) 2.1 2.197 2.025 M1.2*0.25 1.06 1.08 NO.4-48(2.345) 2.4 2.456 2.271 M1.4*0.3 1.24 1.25 NO.5-44(3.175) 2.7 2.74 2.551 M1.6*0.35 1.41 1.43 NO.6-40(3.505) 2.9 3.022 2.82 M1.7*0.35 1.51 1.53 NO.8-36(4.166) 3.5 3.606 3.404 M1.8*0.35 1.61 1.63NO.10-32(4.326) 4.1 4.165 3.963 M2.0*0.4 1.78 1.8NO.12-28(5.846) 4.6 4.724 4.496 M2.2*0.45 1.95 1.981\4-28 5.5 5.588 5.36 M2.3*0.4 2.08 2.15\16-24 6.9 7.035 6.782 M2.5*0.45 2.25 2.283\8-24 8.5 8.636 8.382 M2.6*0.45 2.35 2.387\16-20 9.9 10.033 9.729 M3.0*0.5 2.73 2.751\2-20 11.5 11.607 11.329 M3.5*0.6 3.17 3.29\16-18 12.9 13.081 12.751 M4.0*0.7 3.62 3.65 3.69 5\8-18 14.5 14.681 14.351 M5.0*0.8 4.56 4.6 4.64 3\4-16 17.5 17.678 17.323 M6.0*1.0 5.45 5.5 5.55 7\8-14 20.5 20.675 20.27 M7.0*1.0 6.45 6.5 6.55 1\8-12 23.2 23.571 23.114 M8.0*1.25 7.31 7.38 7.44 1-1\8-12 26.5 26.746 26.289 M10*1.5 9.18 9.25 9.32 1-1\4-12 29.5 29.921 29.464 M10*1.25 9.31 9.38 9.44 1-3\8-12 32 33.096 32.639 M12*1.75 11.04 11.12 11.21 1-1\2-12 36 36.271 35.814 M12*1.25 11.31 11.38 11.44英美联合螺纹标准英美联细螺纹标准规格钻头径2B螺纹径规格钻头径下孔径上限下限上限下限NO.1-64UNC 1.55 1.582 1.425 no.0-80unf 1.25 1.305 1.182 NO.2-56UNC 1.8 1.871 1.695 no.1-72unf 1.55 1.612 1.474 NO.3-48UNC 2.1 2.146 1.941 no.2-64-unf 1.85 1.912 1.756 NO.4-40UNC 2.3 2.385 2.157 no.3-565unf 2.1 2.197 2.025 NO.5-40UNC 2.6 2.679 2.487 no.4-48unf 2.4 2.458 2.271 NO.6-32UNC 2.8 2.895 2.642 no.5-44unf 2.7 2.74 2.551 NO.832UNC 3.4 3.53 3.302 no.6-40unf 2.9 3.022 2.82 NO.10-24UNC 3.9 3.926 3.683 no.8-36unf 3.5 3.606 3.404 NO.12-24UNC 4.5 4.597 4.344 no.10-32unf 4.1 4.165 3.963 1\4-20UNC 5.1 5.257 4..979 no.12-28unf 4.6 4.724 4.496 5\16-18unc 6.6 6.731 6.401 1\4-28unf 5.5 5.588 5.363\8-16UNC 8 8.153 7.798 5\16-24unf 6.9 7.035 6.782 7\16-14UNC 9.4 9.55 9.144 3\8-24unf 8.5 8.636 8.382 1\2-13UNC 10.8 11.023 10.599 7\16-20unf 9.9 10.033 9.729 9\16-12UNC 12.2 12.446 11.989 1\2-unf 11.5 11.607 11.3295\8-11UNC 13.6 13.868 13.386 9\16-unf 12.9 13.081 12.75 3\4-10UNC 16.5 16.84 16.307 5\8-18unf 14.5 14.681 14.35 7\8-9UNC 19.5 19.761 19.177 3\4-16unf 17.5 17.678 17.32 1--8UNC 22.2 22.606 21.971 7\8-14unf 20.5 20.675 20.27 11\8-7UNC 25 25.349 24.813 1--12unf 23.2 23.571 23.11 11\4-7UNC 28.2 28.524 27.813 11\8-12unf 26.5 26.746 26.28 13\8-6UNC 30.8 31.115 30.353 11\4-12unf 29.5 29.921 29.46 11\2-6UNC 34 34.29 33.528 13\8-12unf 32.8 33.096 32.63 13\4-5UNC 39.5 39.827 38.964 11\2-12unf 36 36.271 35.81 2-41\2UNC 45.2 45.593 44.679惠式螺纹标准（旧英制牙）山数节距换算表规格钻头径A例B例山数(25.4) 节数*W1\8-40 2.65 2.6 100 0.254*W5\32-32 3.25 3.2 880 0.317 5*w3\16-24 3..75 3.7 772 0.351 8W1\4-20 5.1 5 64 0.396 9W5\16-18 6.6 5 60 0.423 3W3\8-16 8 6.5 56 0.453 6W7\16-14 9.4 7.9 48 0.529 2W1\2-12 10.7 9.310.5 44 0.577 3W9\16-12 12.3 12 40 0.635W5\8-11 13.7 13.5 36 0.705 6W3\4-10 16.7 16.5 32 0.793 8W7\8-9 19.5 19.3 28 0.907 1W1-8 22.4 22 24 1.058 3W1\8-7 25 24.8 20 1.27W11\4 28.3 28 18 1.411 1W13\8-6 30.5 30.3 16 1.587 5W11\2-6 33.8 33.5 14 1.814 3W15\8-5 36 35.7 13 1.953 8W13\4-5 39.2 39 12 2.116 7W11\8-5 41.8 41.5 11 2.309 1W2-41\2 45 44.7 10 2.54牙套螺纹攻用标准9 2.8222规格钻头径下孔径8 3.175上限下限7 3.6286M3*0.5 3.1 3.2 3.12 6 4.2333M4*0.7 4.2 4.3 4.17 5 5.08M5*0.8 5.2 5.33 5.16 41\2 5.6444M6*1 6.3 6.42 6.25 4 6.35M8*1.25 8.4 8.52 8.31 31\2 7.2571M10*1.5 10.5 10.62 10.37 31\2 7.8154M10*1.25 10.4 10.52 10.31 3 8.4667M10*1 10.3 10.42 10.25 27\8 8.8348M12*1.75 12.5 12.73 12.43 23\4 9.2364M12*1.5 12.5 12.62 12.37 25\8 9.6762M12*1.25 12.5 12.52 12.31 21\2 10.16M14*2 14.5 14.83 14349M14*1.5 14.5 14.62 14.37M16*2 16.5 16.83 16.49M16*1.5 16.5 16.62 16.37M18*2.5 19 19.04 18.58M18*1.5 18.5 18.62 18.37M20*2.5 21 21.04 20.58M20*1.5 20.5 20.62 20.37公制、美制和英制螺纹标准NPT，PT，G 都是管螺纹．NPT 是National (American) Pipe Thread 的缩写，属於美国标准的60 度锥管螺纹，用於北美地区．国家标准可查阅GB/T12716-1991 PT 是Pipe Thread 的缩写，是5 5 度密封圆锥管螺纹，属惠氏螺纹家族，多用於欧洲及英联邦国家．常用於水及煤气管行业，锥度规定为1:16．国家标准可查阅GB/T7306-2000 G 是55 度非螺纹密封管螺纹，属惠氏螺纹家族．标记为G 代表圆柱螺纹．国家标准可查阅GB/T7307-2001 另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英吋．行内人通常用分来称呼螺纹尺寸，一吋等於8分，1/4 吋就是2分，如此类推．G 好像就是管螺纹的统称(Guan)，55，60度的划分属于功能性的，俗称管圆。
公制英制螺纹牙距表
公制英制螺纹牙距表公制牙距英制美制称呼牙数粗牙细牙极细牙粗牙细牙韦氏牙M3 0.5 0.35 4# 1.9 40 48M4 0.7 0.5 6# 3.5 32 40M5 0.8 0.5 8# 4.2 32 36M6 1.0 0.75 10# 4.8 24 32M7 1 0.75 12# 5.5 24 28M8 1.25 1.0 0.75 1/4 6.35 20 28 20 M10 1.5 1.25 1.0 5/16 7.94 18 24 18 M12 1.75 1.5 1.25 3/8 9.53 16 24 16 M14 2.0 1.5 1.0 7/16 11.11 14 20 14 M16 2.0 1.5 1.0 1/2 12.7 13 20 12 M18 2.5 2.0 1.5 9/16 14.29 12 18 12 M20 2.5 2.0 1.5 5/8 15.86 11 18 11 M22 2.5 2.0 1.5 3/4 19.05 10 16 10 M24 3.0 2.0 1.5 7/8 22.23 9 14 9 M27 3.0 2.0 1.5 1 25.4 8 12 8 M30 3.5 3.0 2.0螺纹螺距（粗牙、细牙）对照表各种管材英制及国标公称直径与外径对照表DN|英寸|公称外径之间的关系见下表：公称通径是管路系统中所有管路附件用数字表示的尺寸，公称通径是供参考用的一个方便的圆整数，与加工尺寸仅呈不严格的关系。
公称通径用字母“DN”后面紧跟一个数字标志。
公称通径(nominal diameter)，又称平均外径(mean outside diameter)。
这是缘自金属管的管璧很薄，管外径与管内径相差无几，所以取管的外径与管的内径之平均值当作管径称呼。
DN是公称通径，公称通径(或叫公称直径),就是各种管子与管路附件的通用口径。
其公称直径不是外径，也不是内径，而是近似普通钢管内径的一个名义尺寸。
公制、英制、管螺纹底径孔钻头尺寸表
公称直径
M
1 4 8
14 20
27
36
45
螺距
t 粗 0.25 细 0.2 粗 0.7 细 0.5 粗 1.25 细1
0.75
粗2 细 1.5
1.25 1
粗 2.5 细2
1.5 1 粗3 细2 1.5 1
粗4 细3
2 1.5
粗 4.5 细4
3 2 1.5
钻头直径 d
粗 0.8 细 0.5 粗 1.5 细1
0.75
钻头直径 d
1.6 1.75
4.2 4.5 8.5 9 9.2
粗2
13.9
细 1.5 14.5
1
15
粗 2.5 19.4
细2
19.9
1.5 20.5
1
21
粗 3.5 26.3
细3
26.9
2 27.9
1.5 28.5
1
29
粗4
34.8
细3
35.9
2 36.9
公称直径 （英寸）
1/8 1/4 3/8 1/2 5/8 3/4 7/8
每英寸 牙数
28 19 19 14 14 14 14
钻头直径 d （毫米）
8.8 11.7 15.2 18.9 20.8 24.3 28.1
公称直径 （英寸）
1 1 1/8 1 1/4 1 3/8 1 1/2 1 3/4
2
每英寸 牙数
3 2 1.5 粗5 细4 3 2 1.5
（毫米） 钻头直径
d
2.5 2.65
5 5.2 10.2 10.5 10.7 11 15.4 15.9 16.5 17 20.9 21.9 22.5 23 29.3 29.9 30.9 31.5