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美制螺纹标准对照表美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-32UNC 0.1571 0.1631 0.1399 0.1428 0.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-24 0.1818 0.1890 0.1586 0.1619 0.13794.07 4.10(0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-24 0.2078 0.2150 0.1845 0.1879 0.16394.72 4.75(0.216-24) 5.2781 5.4610 4.6863 4.7727 4.16311/4-20 0.2408 0.2489 0.2127 0.2164 0.18765.45 5.48(0.250-20) 6.1163 6.3221 5.4026 5.4966 4.76505/16-18 0.3026 0.3113 0.2712 0.2752 0.24316.94 6.98(0.3175-18) 7.6860 7.9070 6.8885 6.9901 6.17473/8-16 0.3643 0.3737 0.3287 0.3331 0.29708.40 8.44(0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.34859.83 9.87(0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.404111.34 11.38(0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.458712.80 12.84(0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.511914.27 14.32(0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.625517.28 17.33(0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.736820.27 20.32(0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.844623.22 23.27(1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
美制螺纹标准对照表美制外螺纹(２A)常用规格极限尺寸表(粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径maｘ螺胚直径最小最大最小最大最小最大8－32UNC ０.１571０.1６310.13990.14２80.１２48３.５８３.61(0.16４－32)3.９9０3４.1４27３.5５３53．62７13.16９910-240.1818０.18９00.15860.16１9０.１3794.07４.1０(0.190-24)4.6１774．80064.02844.1123３.５02７12-2４０．２0780.21500.1８４50.18790.1639４.724．7５(0.216－24)5.27８15．46104.６8６34.７727４．16３1１／4-20０.２４0．２4890.21270.21６４0.1876５．45５.4808(０.250 -20)6.11６3６.3２２1５.40265．４9６6４.76５05/１6-180.3０260.3113０．2７１20.27520.243１6.946.98(０．31 75-18)７.68607.90７６.８８856.99016．１7４73/8-1 60.36430．3７３70.32870.3３3１０．２９70８．408.44(0.375-16)9.25329.49２０8.34908.46０77.54３87／16-140.42580.４３61０.３8５0０.3897０.３48５9.839.87(０．437５-14)10．8１5311．076９９.779９.８9848.８5191/2－１30.４8760．4９８50.44350.44８50.404111．3411.３8(0．50-13)12.3850１2.661９11.26４９11．3９1９10.2641９/16－０．０.560０．５0．５００.451１１2５49５9０1６６8８7２．８02．84(０．5６25-1２)１3.957３１４．２46912.740612.8７2711．６5105／８-1１0．６1１3０.623４０.55890.56４40．５11914.27１4．3２(0．625 -11)15.527０1５.83４414.196114．3３581３.00233／4-100.73530.74820.6７7３0.６832０.6２5５17.28１７.33(0.７5０-10）18.676619.004317.2０3417.35３315.8８77７/８-9０．859２０.87310.79460.800９0.７36820．27２0.32(0.８７5-9)21．82372２.17６720．1８2８20．3429１8.714７１"-8０.９０.9９800．９１0０0.91680．84４623.222３．83027(1.０00-8）２4.968225.３49223.114０23．２86721.4５281.螺胚直径指滚丝前的尺寸,数值为依经验公式计算而得，在实践中需验证。
美制螺纹标准对照表美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-32UNC 0.1571 0.1631 0.1399 0.1428 0.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-24 0.1818 0.1890 0.1586 0.1619 0.13794.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-24 0.2078 0.2150 0.1845 0.1879 0.16394.72 4.75 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.16311/4-20 0.2408 0.2489 0.2127 0.2164 0.18765.45 5.48 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.76505/16-18 0.3026 0.3113 0.2712 0.2752 0.24316.94 6.98 (0.3175-18)7.6860 7.9070 6.8885 6.9901 6.17473/8-16 0.3643 0.3737 0.3287 0.3331 0.29708.40 8.44 (0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.34859.83 9.87 (0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.404111.34 11.38 (0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.458712.80 12.84 (0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.511914.27 14.32 (0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.625517.28 17.33 (0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.736820.27 20.32 (0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.844623.22 23.27 (1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
美制螺纹标准对照表美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-32UNC 0.15710.16310.13990.14280.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-240.18180.18900.15860.16190.13794.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-240.20780.21500.18450.18790.16394.72 4.75 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.16311/4-200.24080.24890.21270.21640.18765.45 5.48 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.76505/16-180.30260.31130.27120.27520.24316.94 6.98 (0.3175-18)7.68607.9070 6.8885 6.9901 6.17473/8-160.36430.37370.32870.33310.29708.408.44 (0.375-16)9.25329.49208.34908.46077.54387/16-140.42580.43610.38500.38970.34859.839.87 (0.4375-14)10.815311.07699.77909.89848.85191/2-130.48760.49850.44350.44850.404111.3411.38 (0.50-13)12.385012.661911.264911.391910.26419/16-120.54950.56090.50160.50680.458712.8012.84 (0.5625-12)13.957314.246912.740612.872711.65105/8-110.61130.62340.55890.56440.511914.2714.32 (0.625-11)15.527015.834414.196114.335813.00233/4-100.73530.74820.67730.68320.625517.2817.33 (0.750-10)18.676619.004317.203417.353315.88777/8-90.85920.87310.79460.80090.736820.2720.32 (0.875-9)21.823722.176720.182820.342918.71471"-80.98300.99800.91000.91680.844623.2223.27 (1.000-8)24.968225.349223.114023.286721.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
美制管螺纹尺寸表[美制螺纹标准对照表]美制螺纹标准对照表每英寸牙数 8-32 (0.164-32) 10-24 (0.190-24) 12-24 (0.216-24) 1/4-20 (0.250-20) 5/16-18 (0.3175-18) 3/8-16 (0.375-16)7/16-14 (0.4375-14) 1/2-13 (0.50-13) 9/16-12 (0.5625-12) 5/8-11 (0.625-11) 3/4-10 (0.750-10) 7/8-9 (0.875-9) 1"-8 (1.000-8)UNC美制外螺纹（2A）常用规格极限尺寸附注（粗牙）大径极限最小 0.1571 3.9903 0.1818 4.6177 0.2078 5.2781 0.2408 6.1163 0.3026 7.6860 0.3643 9.2532 0.4258 10.81530.4876 12.3850 0.5495 13.9573 0.6113 15.5270 0.7353 18.6766 0.8592 21.8237 0.9830 24.9682最大 0.1631 4.1427 0.1890 4.8006 0.2150 5.4610 0.24896.3221 0.31137.9070 0.3737 9.4920 0.4361 11.0769 0.498512.6619 0.5609 14.2469 0.6234 15.8344 0.7482 19.0043 0.8731 22.1767 0.9980 25.3492中径极限最小 0.1399 3.5535 0.1586 4.0284 0.1845 4.6863 0.2127 5.4026 0.2712 6.8885 0.3287 8.3490 0.3850 9.77900.4435 11.2649 0.5016 12.7406 0.5589 14.1961 0.6773 17.2034 0.7946 20.1828 0.9100 23.1140最大 0.1428 3.6271 0.1619 4.1123 0.1879 4.7727 0.21645.4966 0.27526.9901 0.3331 8.4607 0.3897 9.8984 0.448511.3919 0.5068 12.8727 0.5644 14.3358 0.6832 17.3533 0.8009 20.3429 0.9168 23.2867代号小径max0.1248 3.1699 0.1379 3.5027 0.1639 4.1631 0.1876 4.7650 0.2431 6.1747 0.2970 7.5438 0.3485 8.8519 0.4041 10.26410.4587 11.6510 0.5119 13.0023 0.6255 15.8877 0.7368 18.7147 0.8446 21.4528最小 3.58 4.07 4.72 5.45 6.94 8.40 9.83 11.34 12.80 14.27 17.28 20.27 23.22螺胚直径最大 3.61 4.10 4.75 5.48 6.98 8.44 9.87 11.38 12.84 14.32 17.33 20.32 23.27公称尺寸和螺纹系列1.螺胚直径指滚丝前的尺寸，数值为依历练公式计算而得，在实践中需验证。
美制螺纹尺寸对照表最小最大最小最大8-320.15710.16310.13990.14280.1248(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.1699 10-240.18180.1890.15860.16190.1379(0.190-24) 4.6177 4.8006 4.0284 4.1123 3.5027 12-240.20780.2150.18450.18790.1639(0.216-24) 5.2781 5.461 4.6863 4.7727 4.1631 1/4-200.24080.24890.21270.21640.1876(0.250-20) 6.1163 6.3221 5.4026 5.4966 4.765 5/16-180.30260.31130.27120.27520.2431(0.3175-18)7.6867.9076.8885 6.9901 6.1747 3/8-160.36430.37370.32870.33310.297(0.375-16)9.25329.4928.3498.46077.5438 7/16-140.42580.43610.3850.38970.3485(0.4375-14)10.815311.07699.7799.89848.8519 1/2-130.48760.49850.44350.44850.4041(0.50-13)12.38512.661911.264911.391910.26419/16-120.54950.56090.50160.50680.4587(0.5625-12)13.957314.246912.740612.872711.651 5/8-110.61130.62340.55890.56440.5119(0.625-11)15.52715.834414.196114.335813.0023 3/4-100.73530.74820.67730.68320.6255(0.750-10)18.676619.004317.203417.353315.8877 7/8-90.85920.87310.79460.80090.7368(0.875-9)21.823722.176720.182820.342918.71471"-80.9830.9980.910.91680.8446(1.000-8)24.968225.349223.11423.286721.4528最小最大最小最大8-360.15770.16320.14240.14520.1291(0.164-36) 4.0056 4.1453 3.617 3.6881 3.2791 10-320.18310.18910.16580.16880.1508(0.190-32) 4.6507 4.8031 4.2113 4.2875 3.8303 12-280.20850.2150.18860.19180.1712美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max 1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
美制螺纹标准对照表美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-32UNC 0.1571 0.1631 0.1399 0.1428 0.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-24 0.1818 0.1890 0.1586 0.1619 0.13794.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-24 0.2078 0.2150 0.1845 0.1879 0.16394.72 4.75 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.16311/4-20 0.2408 0.2489 0.2127 0.2164 0.18765.45 5.48 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.76505/16-18 0.3026 0.3113 0.2712 0.2752 0.24316.94 6.98 (0.3175-18)7.6860 7.9070 6.8885 6.9901 6.17473/8-16 0.3643 0.3737 0.3287 0.3331 0.29708.40 8.44 (0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.34859.83 9.87 (0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.404111.34 11.38 (0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.458712.80 12.84 (0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.511914.27 14.32 (0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.625517.28 17.33 (0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.736820.27 20.32 (0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.844623.22 23.27 (1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-24UNC-2A(或0.190-24UNC-2A)、3/8-16UNC-2A(或0.375-16UNC-2A) （注：表中上行斜体数值单位为英寸，下行为毫米）美制外螺纹（2A）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-36UNF 0.1577 0.1632 0.1424 0.1452 0.12913.65 3.67(0.164-36) 4.0056 4.1453 3.6170 3.6881 3.279110-32 0.1831 0.1891 0.1658 0.1688 0.15084.24 4.27 (0.190-32) 4.6507 4.8031 4.2113 4.2875 3.830312-28 0.2085 0.2150 0.1886 0.1918 0.17124.82 4.85 (0.216-28)5.2959 5.4610 4.7904 4.8717 4.34851/4-28 0.2425 0.2490 0.2225 0.2258 0.20525.69 5.71 (0.250-28)6.1595 6.3246 5.6515 5.7353 5.21215/16-24 0.3042 0.3114 0.2806 0.2843 0.26037.17 7.20 (0.3175-24) 7.7267 7.9096 7.1272 7.2212 6.61163/8-24 0.3667 0.3739 0.3430 0.3468 0.32288.75 8.78 (0.375-24) 9.3142 9.4971 8.7122 8.8087 8.19917/16-20 0.4281 0.4362 0.3995 0.4037 0.374910.19 10.23 (0.4375-20) 10.8737 11.0795 10.1473 10.2540 9.52251/2-20 0.4906 0.4987 0.4619 0.4662 0.437411.78 11.82 (0.50-20) 12.4612 12.6670 11.7323 11.8415 11.11009/16-18 0.5524 0.5611 0.5205 0.5250 0.492913.27 13.31 (0.5625-18) 14.0310 14.2519 13.2207 13.3350 12.51975/8-18 0.6149 0.6236 0.5828 0.5875 0.555414.85 14.89 (0.625-18) 15.6185 15.8394 14.8031 14.9225 14.10723/4-16 0.7391 0.7485 0.7029 0.7079 0.671817.91 17.95 (0.750-16) 18.7731 19.0119 17.8537 17.9807 17.06377/8-14 0.8631 0.8734 0.8216 0.8270 0.785820.93 20.97 (0.875-14) 21.9227 22.1844 20.8686 21.0058 19.95931"-12 0.9868 0.9982 0.9382 0.9441 0.896023.90 23.95 (1.000-12) 25.0647 25.3543 23.8303 23.9801 22.75841.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或0.375-24UNF-2A)美制内螺纹（2B）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号小径极限中径极限大径min底孔直径最小最大最小最大最小最大8-32UNC 0.1300 0.1390 0.1437 0.1475 0.16403.40 3.50(0.164-32) 3.3020 3.5306 3.6500 3.7465 4.165610-24 0.1450 0.1560 0.1629 0.1672 0.19003.75 3.90 (0.190-24) 3.6830 3.96244.1377 4.2469 4.826012-24 0.1710 0.1810 0.1889 0.1933 0.21604.40 4.55 (0.216-24) 4.3434 4.5974 4.7981 4.90985.48641/4-20 0.1960 0.2070 0.2175 0.2224 0.25005.05 5.20 (0.250-20) 4.9784 5.2578 5.5245 5.64906.35005/16-18 0.2520 0.2650 0.2764 0.2817 0.31256.45 6.60 (0.3175-18) 6.4008 6.73107.0206 7.1552 7.93753/8-16 0.3070 0.3210 0.3344 0.3401 0.37507.85 8.00 (0.375-16) 7.7978 8.1534 8.4938 8.6385 9.52507/16-14 0.3600 0.3760 0.3911 0.3972 0.43759.20 9.40 (0.4375-14) 9.1440 9.5504 9.9339 10.0889 11.11251/2-13 0.4170 0.4340 0.4500 0.4565 0.500010.65 10.90 (0.50-13) 10.5918 11.0236 11.4300 11.5951 12.70009/16-12 0.4720 0.4900 0.5084 0.5152 0.562512.05 12.30 (0.5625-12) 11.9888 12.4460 12.9134 13.0861 14.28755/8-11 0.5270 0.5460 0.5660 0.5732 0.625013.45 13.70 (0.625-11) 13.3858 13.8684 14.3764 14.5593 15.87503/4-10 0.6420 0.6630 0.6850 0.6927 0.750016.40 16.70 (0.750-10) 16.3068 16.8402 17.3990 17.5946 19.05007/8-9 0.7550 0.7780 0.8028 0.8110 0.875019.30 19.60 (0.875-9) 19.1770 19.7612 20.3911 20.5994 22.22501"-8 0.8650 0.8900 0.9188 0.9276 1.000022.10 22.40 (1.000-8) 21.9710 22.6060 23.3375 23.5610 25.40001.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
2.标记示例：10-24UNC-2B(或0.190-24UNC-2B)、3/8-16UNC-2B(或0.375-16UNC-2B)美制内螺纹（2B）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列代号小径极限中径极限大径min底孔直径最小最大最小最大最小最大8-36UNF 0.1340 0.1420 0.1460 0.1496 0.16403.45 3.67(0.164-36) 3.4036 3.6068 3.7084 3.7998 4.165610-32 0.1560 0.1640 0.1697 0.1736 0.19004.00 4.27 (0.190-32) 3.9624 4.1656 4.3104 4.4094 4.826012-28 0.1770 0.1860 0.1928 0.1970 0.21604.55 4.85 (0.216-28) 4.4958 4.7244 4.89715.0038 5.48641/4-28 0.2110 0.2200 0.2268 0.2311 0.25005.40 5.71 (0.250-28) 5.3594 5.5880 5.7607 5.86996.35005/16-24 0.2670 0.2770 0.2854 0.2902 0.31256.857.20 (0.3175-24) 6.7818 7.0358 7.2492 7.3711 7.93753/8-24 0.3300 0.3400 0.3479 0.3528 0.37508.45 8.78 (0.375-24) 8.3820 8.6360 8.8367 8.9611 9.52507/16-20 0.3830 0.3950 0.4050 0.4104 0.43759.85 10.23 (0.4375-20) 9.7282 10.0330 10.2870 10.4242 11.11251/2-20 0.4460 0.4570 0.4675 0.4731 0.500011.40 11.82 (0.50-20) 11.3284 11.6078 11.8745 12.0167 12.70009/16-18 0.5020 0.5150 0.5264 0.5323 0.562512.85 13.31 (0.5625-18) 12.7508 13.0810 13.3706 13.5204 14.28755/8-18 0.5650 0.5780 0.5889 0.5949 0.625014.45 14.89 (0.625-18) 14.3510 14.6812 14.9581 15.1105 15.87503/4-16 0.6820 0.6960 0.7094 0.7159 0.750017.40 17.95 (0.750-16) 17.3228 17.6784 18.0188 18.1839 19.05007/8-14 0.7980 0.8140 0.8286 0.8356 0.875020.35 20.97 (0.875-14) 20.2692 20.6756 21.0464 21.2242 22.22501"-12 0.9100 0.9280 0.9459 0.9535 1.000023.90 23.95 (1.000-12) 23.1140 23.5712 24.0259 24.2189 25.40001.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
