美制螺纹标准对照表

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)7.6867.907 6.8885 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。

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 0.15710.16310.13990.14280.12483.58 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。

美制螺纹美制标准螺纹（也称统一制螺纹）量规用于检测螺纹的内外牙，螺纹牙形角60度，由外径、每英寸牙数、精度组合表示，如1/4-20UNC-2B，表示1/4英寸外径、每英寸20牙、2B精度内螺纹塞规，若是左旋旋向，应加LH表示。

美制内螺纹默认精度为2B，3B紧密级亦可提供，此外美制外螺纹的默认精度为2A，紧密级精度为3A，订货时注明精度，不提供精度按默认精度提供。

美制螺纹系列众多，美制粗牙（UNC）、美制细牙（UNF）、美制特细牙（UNEF）、美制不变螺距螺纹（UN）、美制特殊螺纹（UNS）。

还有一些美制牙将另外描叙。

第二次世界大战中，盟军的武器和装备所使用的螺纹主要有两种：一种是英国的惠氏螺纹（BSW、BSF）；另一种是美国国家螺纹（UNC、UNF、UNEF、UN、UNS）；由于两种螺纹的标准不统一，给盟军造成了严重的经济损失和人员伤亡。

二战结束以后，美国、英国和加拿大等盟国马上制定了统一的螺纹标准，由于当时美国的经济实力和军事实力在盟军中占主导地位，统一制螺纹主要是依据美国国家螺纹标准制定的，因此，在紧固螺纹领域，统一制螺纹开始挤占英国惠氏螺纹的使用市场，惠氏螺纹的圆弧牙顶和牙底牙型，叫英国吃了苦果；另外，澳大利亚、马来西亚、印度尼西亚、阿根廷、智利、比利时、匈牙利、意大利、瑞典、捷克等各国家也制定了惠氏螺纹国家标准。

现在世界各国使用惠氏螺纹（BSW、BSF）的国家在不断减少，取而代之的是统一制螺纹（UNC、UNF、UNEF、UN、UNS）。

美制螺纹（UNC、UNF、UNEF、UN、UNS）相关规格：NO：0-80UNF、NO：1-64UNC、NO：2-56UNC、NO：3-48UNC、NO：4-40UNC、NO：4-48UNF、NO：5-40UNC、NO：6-32UNC、NO：6-40UNF、NO：8-32UNC、NO：8-36UNC、NO：10-24UNC、NO：10-32UNF、NO：10-40UNS、NO：12-24UNC、NO：12-28UNF、NO：12-36UNS、1/4-20UNC、1/4-24UNS、1/4-28UNF、1/4-32UNEF、5/16-18UNC、5/16-20UN、5/16-24UNF、5/16-27UNS、5/16-32UNEF、3/8-16UNC、3/8-20UN、3/8-24UNF、3/8-32UNEF、7/16-14UNC、7/16-20UNF、7/16-24UNS、7/16-28UNEF、1/2-12UNS、1/2-13UNC、1/2-16UN、1/2-20UNF、1/2-28UNEF、9/16-12UNC、9/16-18UNF、9/16-24UNEF、5/8-11UNC、5/8-18UNF、5/8-24UNEF、3/4-10UNC、3/4-16UNF、3/4-20UNEF、3/4-24UNS、7/8-14UNF、7/8-20UNEF、7/8-24UNS、15/16-28UN、1"-8UNC、1"-12UNF、1"-20UNEF、1-1/8-12UNF、1-1/8-16UN、1-1/4-7UNC、1-1/4-12UNF、1-1/2-6UNC等等。

螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 1-64UNC640.2360.3972A 1.83896 1.74244 1.58242 1.53162 1.366522B 1.42494 1.58242 1.59766 1.6637 1.8542 1.3973A1.8542 1.75768 1.59766 1.55956 1.381763B 1.42494 1.58242 1.59766 1.64592 1.8542 1.3971-72UNF720.210.3532A 1.83896 1.75006 1.61036 1.5621 1.419862B 1.4732 1.6129 1.6256 1.6891 1.8542 1.51133A1.8542 1.7653 1.6256 1.59004 1.43513B 1.4732 1.6129 1.6256 1.67386 1.8542 1.51132-56UNC560.2710.4542A 2.16916 2.06502 1.87452 1.82118 1.630682B 1.69418 1.87198 1.88976 1.96088 2.1844 1.70183A2.1844 2.08026 1.88976 1.84912 1.645923B 1.69418 1.87198 1.88976 1.9431 2.1844 1.70182-64UNF640.2360.3972A 2.16916 2.07264 1.91262 1.86182 1.696722B 1.75514 1.91262 1.92786 1.99644 2.1844 1.7783A2.1844 2.08788 1.92786 1.88976 1.711963B 1.75514 1.91262 1.92786 1.97866 2.1844 1.7783-48UNC480.3150.5292A 2.49682 2.38252 2.15392 2.0955 1.864362B 1.94056 2.1463 2.1717 2.2479 2.5146 1.99393A2.5146 2.4003 2.1717 2.12852 1.882143B 1.94056 2.1463 2.1717 2.22758 2.5146 1.99393-56UNF560.2710.4542A 2.49682 2.39268 2.20218 2.1463 1.958342B 2.02438 2.1971 2.21996 2.29108 2.5146 2.05743A2.5146 2.41046 2.21996 2.17932 1.976123B 2.02438 2.1971 2.21996 2.2733 2.5146 2.05744-40UNC400.3780.6352A 2.82448 2.69494 2.413 2.3495 2.067562B 2.15646 2.38506 2.43332 2.51714 2.8448 2.18443A2.8448 2.71526 2.43332 2.38506 2.087883B 2.15646 2.38506 2.43332 2.49428 2.8448 2.18444-48UNF480.3150.5292A 2.82702 2.71272 2.48412 2.42316 2.194562B 2.27076 2.45872 2.5019 2.58064 2.8448 2.26063A2.8448 2.7305 2.5019 2.45618 2.212343B 2.27076 2.45872 2.5019 2.56032 2.8448 2.26065-40UNC400.3780.6352A 3.15468 3.02514 2.7432 2.67716 2.397762B 2.48666 2.69748 2.76352 2.84734 3.175 2.52733A3.175 3.04546 2.76352 2.71526 2.418083B 2.48666 2.69748 2.76352 2.82702 3.175 2.52735-44UNF440.3440.5772A 3.15722 3.0353 2.7813 2.7178 2.468882B 2.55016 2.74066 2.79908 2.88036 3.175 2.57813A3.175 3.05308 2.79908 2.75082 2.486663B 2.55016 2.74066 2.54508 2.86004 3.175 2.57816-32UNC320.4720.7942A 3.48488 3.33248 2.96926 2.89814 2.542B 2.6416 2.8956 2.98958 3.08356 3.5052 2.70513A3.5052 3.3528 2.98958 2.93624 2.560323B 2.6416 2.8956 2.98958 3.05816 3.5052 2.70516-40UNF400.3780.6352A 3.48488 3.35534 3.0734 3.00736 2.727962B 2.8194 3.0226 3.09372 3.18008 3.5052 2.87023A3.50523.375663.093723.042922.748283B2.81943.012443.093723.157223.50522.8702公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径0.073（#1）1.8540.086(#2)2.1840.099(3#)2.515螺纹中经公差代号螺纹小径螺纹中径0.112(#4)2.8450.125(#5)3.1750.138(#6）3.505螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径8-32UNC320.4720.7842A 4.14274 3.99034 3.62712 3.55346 3.197862B 3.302 3.5306 3.64998 3.7465 4.1656 3.45443A4.1656 4.0132 3.64998 3.5941 3.220723B 3.302 3.52806 3.64998 3.7211 4.1656 3.45448-36UNF360.4210.7062A 4.14528 4.00558 3.68808 3.61696 3.304542B 3.4036 3.6068 3.7084 3.79984 4.1656 3.45443A4.1656 4.0259 3.7084 3.65506 3.324863B 3.4036 3.59664 3.7084 3.77698 4.1656 3.454410-24UNC240.631.0582A 4.8006 4.61772 4.11226 4.02844 3.540762B 3.683 3.9624 4.13766 4.24688 4.826 3.73383A4.826 4.64312 4.13766 4.07416 3.566163B 3.683 3.9497 4.13766 4.21894 4.826 3.733810-28UNS 280.540.9072A 4.8006 4.6355 4.21132 4.1275 3.718562B 3.8354 4.064 4.23672 4.34594 4.826 3.860810-32UNF320.4720.7842A 4.80314 4.65074 4.28752 4.21132 3.858262B 3.9624 4.1656 4.31038 4.40944 4.826 3.98783A 4.826 4.6736 4.31038 4.25196 3.881123B 3.9624 4.16814 4.31038 4.38404 4.826 3.987810-36UNS 360.4210.7062A 4.80314 4.66344 4.34594 4.26974 3.96242B 4.064 4.2164 4.3688 4.46786 4.826 4.038610-40UNS 400.3780.6352A 4.80314 4.6736 4.39166 4.318 4.043682B 4.1402 4.2926 4.41452 4.5085 4.826 4.089410-48UNS 480.3150.5292A 4.80568 4.69138 4.46278 4.39674 4.175762B 4.2418 4.3688 4.4831 4.56946 4.826 4.216410-56UNS 560.2710.4542A 4.80822 4.70408 4.51358 4.45008 4.269742B 4.3434 4.445 4.53136 4.61264 4.826 4.305312-24UNC240.631.0582A 5.461 5.27812 4.77266 4.6863 4.201162B 4.3434 4.5974 4.79806 4.90982 5.4864 4.49583A5.4864 5.30352 4.79806 4.73202 4.226563B 4.3434 4.58978 4.79806 4.88188 5.4864 4.495812-28UNF280.540.9072A 5.461 5.2959 4.87172 4.79044 4.378962B 4.4958 4.7244 4.89712 5.0038 5.4864 4.5723A5.4864 5.3213 4.89712 4.83616 4.404363B 4.4958 4.71678 4.89712 4.97586 5.4864 4.57212-32UNEF320.4720.7842A 5.46354 5.31114 4.94792 4.86918 4.518662B 4.6228 4.826 4.97078 5.07492 5.4864 4.5723A5.4864 5.334 4.97078 4.90982 4.541523B 4.6228 4.8133 4.97078 5.04952 5.4864 4.57212-36UNS 360.4210.7062A 5.46354 5.32384 5.00634 4.93014 4.879342B 4.7244 4.8768 5.0292 5.12826 5.4864 4.800612-40UNS 400.3780.6352A 5.46354 5.334 5.05206 4.9784 4.66092B 4.8006 4.953 5.07492 5.1689 5.4864 4.851412-48UNS 480.3150.5292A 5.46608 5.35178 5.12318 5.05714 4.836162B 4.9022 5.0292 5.1435 5.22986 5.4864 4.978412-56UNS560.2710.4542A5.468625.364485.173985.110484.930142B5.00385.10545.191765.273045.48644.97840.164（#8）4.1660.19（#10）4.8260.216（#12）0.486螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径1/4-20UNC200.7561.271A 6.32206 6.01218 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15.163815.455916.0883616.2229817.462515.4762211/16-16UN160.861.5882A 17.4269417.1881816.395716.2737815.534642B 15.74816.103616.4312616.5887417.462515.8753A17.462517.2237416.4312616.3398215.57023B 15.74815.9613616.4312616.548117.4625 1.587511/16-20UN200.7561.272A 17.4294817.2237416.6039816.4947615.918182B 16.078216.38316.63716.7792417.462516.271243A17.462517.2567616.63716.5557215.95123B 16.078216.2864816.63716.7436817.462516.2712411/16-24UNEF240.631.0582A 17.4320217.2491416.7436816.6420816.172182B 16.306816.560816.4947616.9062417.462516.271243A9.842517.2796216.7741616.6979616.30683B 16.306816.4947616.7741616.8732217.462516.2712411/16-28UN280.540.9072A 17.4345617.2694616.8452816.7487616.48462B 16.484616.687816.8732216.9976817.462516.667483A17.462517.297416.8732216.802116.48463B 16.484616.6395416.8732216.967217.462516.6674811/16-32UN320.4720.7942A 17.4345617.2821616.9189416.827516.489682B 16.611616.789416.9468817.0637217.462516.667483A17.462517.310116.9468816.878316.517623B 16.611616.7487616.9468817.0357817.462516.667483/4-10UNC101.5132.541A 19.0042818.5115217.3532817.1297615.979141B 16.306816.840217.39917.691119.0516.667482A 19.0042818.6766217.3532817.2034215.979142B 16.306816.840217.39917.5945819.0516.667483A19.0518.7223417.39917.2872416.024863B 16.306816.624317.39917.5437819.0516.667483/4-12UN121.262.1172A 19.0068218.7172617.6326817.4929816.487142B 16.76417.221217.6758617.8587419.0517.066263A19.0518.7604417.6758617.5717216.530323B 16.76417.0357817.6758617.8130219.0517.066263/4-14UNS 14 1.081 1.8142A 19.011918.7502817.8333417.703816.59892B 17.094217.475217.8714418.0416219.0517.066263/4-16UNF160.861.5881A 19.011918.6512217.9806617.7901617.11961B 17.322817.678418.0187618.2676819.0517.46252A19.011918.7731417.9806617.8536617.11962B 17.322817.678418.0187618.1838619.0517.46253A19.0518.8112418.0187617.9222417.15773B 17.322817.5463218.0187618.1432219.0517.46253/4-18UNS 180.841 1.4112A 19.0144418.7934618.326117.9806617.33552B 17.52617.856218.1330618.2854619.0517.46253/4-20UNEF200.7561.272A 19.0169818.8112418.1914818.0797217.505682B 17.678417.957818.224518.3692819.0517.858743A19.0518.8442618.224518.1406817.53873B 17.678417.8739818.224518.3337219.0517.858743/4-24UNEF240.631.0582A19.0195218.8366418.3311818.2270417.759682B17.90718.16118.3616618.4962819.0517.858740.6875"17.4630.75"19.05螺纹小径螺纹外径MaxMinMaxMinMaxMin Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A19.0195218.8493418.4073818.3083217.899383B 18.03418.262618.4378618.567419.0517.858743/4-28UN280.540.9072A 19.0195218.8544218.4302418.3337217.937482B 18.059418.28818.4607218.5877219.0518.254983A19.0518.884918.4607218.3870617.967963B 18.059418.2270418.4607218.554719.0518.254983/4-32UN320.4720.7842A 19.0220618.8696618.5064418.41518.077182B 18.186418.389618.5343818.6537619.0518.254983A19.0518.897618.5343818.465818.105123B 18.186418.3362618.5343818.6258219.0518.2549813/16-10UNC101.5132.542A 20.5917820.2641218.986518.8366417.612362B 17.894318.427718.986519.278620.637518.254983A20.637520.3098419.0322218.9204617.520923B 17.894318.427718.986519.1820820.637518.2549813/16-12UN121.262.1172A 20.5943220.3047619.2201819.0804818.201642B 18.338818.79619.2633619.4462420.637518.653763A20.637520.3479419.2633619.1592218.117823B 18.338818.6156619.2633619.4005220.637518.6537613/16-16UN160.861.5882A 20.599420.3606419.5681619.443718.70712B 18.92319.278619.6062619.7662820.637519.053A20.637520.3987419.6062619.5148218.74523B 18.92319.1338219.6062619.7256420.637519.0513/16-20UNEF200.7561.272A 20.6044820.3987419.7789819.6672219.093182B 19.253219.55819.81219.9567820.637519.446243A20.637520.4317619.81219.7281819.12623B 19.253219.4614819.81219.9212220.637519.4462413/16-28UN280.540.9072A 20.6070220.4419220.0177419.9212219.524982B 19.659619.862820.0482220.1752220.637519.842483A20.637520.421620.0482219.9745619.555463B 19.659619.8145420.0482220.142220.637519.8424813/16-32UN320.4720.7842A 20.6095620.4571620.0939420.002519.664682B 19.786619.964420.1218820.2412620.637519.842483A20.637520.485120.1218820.053319.692623B 19.786619.9237620.1218820.2133220.637519.842487/8-9UNC91.682.8221A 22.1767421.6484220.3428620.1015618.816321B 19.17719.761220.8483220.7035422.22519.446242A 22.1767421.8236820.3428620.1828418.816322B 19.17719.761220.8483220.599422.22519.446243A22.22521.8719420.3911220.2717418.864583B 19.17719.5097420.8483220.5460622.22519.446247/8-10UNS 10 1.513 2.542A 22.1792821.8516220.5282820.3758819.156682B 19.481820.015220.57420.7721222.22519.842487/8-12UN121.262.1172A 22.1818221.8922620.8076820.6679819.662142B 19.93920.396220.8508621.0337422.22520.241263A22.22521.9354420.8508620.7467219.705323B 19.93920.1879220.8508620.9880222.22520.241267/8-14UNF141.0811.8141A22.1843621.7906621.005820.8000620.025361B20.269220.675621.0464421.3156822.22520.63750.8125"20.638螺纹小径螺纹外径MaxMinMax MinMaxMin Max MinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径2A 22.1843621.9227421.005820.8686420.025362B 20.269220.675621.0464421.2242422.22520.63753A22.22521.9633821.0464420.942320.0663B 20.269220.4927221.0464421.1810622.22520.63757/8-16UN160.861.5882A 22.186921.9481421.1556621.031220.0662B 20.497820.853421.1937621.3537822.22520.63753A22.22521.9862421.1937621.1023220.33273B 20.497820.7213221.1937621.3131422.22520.63757/8-18UNS 180.841 1.4112A 22.1894421.9684621.272521.1556620.51052B 20.70121.031221.3080621.4604622.22521.033747/8-20UNEF200.7561.272A 22.1919821.9862421.3664821.2547220.680682B 20.853421.132821.399521.5442822.22521.033743A22.22522.0192621.399521.3156820.71373B 20.853421.0489821.399521.5087222.22521.033747/8-24UNS 240.63 1.0582A 22.1945222.0116421.5061821.4020420.934682B 21.08221.33621.5366621.6712822.22521.033747/8-27UNS 270.560.9412A 22.1945222.0243421.5823821.4833221.074382B 21.20921.437621.6128621.742422.22521.429987/8-28UN280.540.9072A 22.1945222.0294221.6052421.5087221.112482B 21.234421.46321.6357221.7627222.22521.429983A22.22522.059921.6357221.5620621.142963B 21.234421.4020421.6357221.729722.22521.429987/8-32UN320.4720.7842A 22.1970622.0446621.6814421.5921.252182B 21.361421.564621.7093821.8287622.22521.429983A22.22522.072621.7093821.640821.280123B 21.361421.5112621.7093821.8008222.22521.4299815/16-9UNC91.682.8222A 23.7693223.4162621.9354421.7754220.40892B 22.136121.348721.9786222.186923.812521.033743A23.812523.4594421.9786221.8592420.452083B 22.136121.0972421.9786222.1335623.812521.0337415/16-12UN121.262.1172A 23.7693223.4797622.3951822.250421.249642B 21.513821.97122.4383622.6263223.812521.828763A23.812523.5229422.4383622.3342221.292823B 21.513821.780522.4383622.5780623.812521.8287615/16-16UN160.861.5882A 23.774423.5356422.7431622.6161621.88212B 22.09822.453622.7812622.9463623.812524.7653A23.812523.5737422.7812622.6872821.92023B 22.09822.3088222.7812622.9057223.812522.22515/16-20UNEF200.7561.272A 23.7769423.571222.9514422.8371422.265642B 22.428222.73322.98723.1368623.812522.2253A23.812523.6067622.98722.9006422.30123B 22.428222.6364822.98723.0987623.812522.22515/16-28UN280.540.9072A 23.7820223.6169223.1927423.0911422.699982B 22.834623.037823.2232223.355323.812523.017483A23.812523.647423.2232223.1470222.730463B 22.834622.9895423.2232223.3222823.812523.0174815/16-32UN320.4720.7842A23.7845623.6321623.2689423.1724222.839682B22.961623.139423.2968823.4213423.812523.017480.875"22.2250.9375"23.813。

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。

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 ）序号序号规格型号规格型号最大最大最小最小公差公差最小最小最大最大公差公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.305 2 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.279 3 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.330 4 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.356 5 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406 6 11/16-12 26.944 26.655 0.290 24.689 25.146 0.457 7 15/16-12 33.294 33.005 0.290 31.039 31.496 0.457 8 15/8-12 41.229 40.940 0.290 38.989 39.446 0.457 9 17/8-12 47.579 47.290 0.290 45.339 45.796 0.457 10 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 内螺纹小径内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.240 2 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.300 3 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.300 4 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.300 5 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.300 6 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.300 7 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.300 8 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.300 9 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.300 10 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.300 11 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.300 12 M27*2 26.962 26.682 0.280 24.835 25.210 0.375 13 M30*2 29.962 29.682 0.280 27.835 28.210 0.375 14 M33*2 32.962 32.682 0.280 30.835 31.210 0.375 15 M36*2 35.962 35.682 0.280 33.835 34.210 0.375 16 M42*2 41.962 41.682 0.280 39.835 40.210 0.375 英制管螺纹英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.282 2 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.445 3 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.445 4 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.541 5 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.541 6 G1-11 33.249 32.889 0.360 30.291 30.931 0.640 7 G11/4-11 41.910 41.550 0.360 38.952 39.592 0.640 8 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A 型美制螺纹（UNF ）常用规格 外螺纹外螺纹内螺纹 -4 9/16"-199/16"-19牙 14.28 14.28 13.0813.08-6 11/16''-16 11/16''-16 17.46 17.46 16.116.1-8 13/16''-16 13/16''-16 20.64 20.64 19.2819.28 -10 1''-14 1''-14 25.40 25.40 23.5723.57-12 1(3/16)''-12 1(3/16)''-12 30.00 30.00 28.3228.32-16 1(7/16)''-12 1(7/16)''-12 36.51 36.51 34.6734.67-20 1(11/16)''-12 1(11/16)''-12 42.86 42.86 41.0241.02C 型JIC37度美制UNF 螺纹常用规格 -4 7/16”-20 7/16”-20 11.11 11.11 10.0310.03 -5 1/2”-20 1/2”-20 12.70 12.70 11.32 11.32-6 9/16”-18 9/16”-18 14.28 14.28 13.0813.08-8 3/4”-16 3/4”-16 19.00 19.00 17.6817.68-10 7/8”-14 7/8”-14 22.22 22.22 20.6820.68-12 1(1/16)"-12 1(1/16)"-12 26.98 26.98 25.1525.15-16 1(5/16)"-12 1(5/16)"-12 33.33 33.33 31.531.5-20 1(5/8)"-12 1(5/8)"-12 41.28 41.28 39.4439.44 -24 1(7/8)"-12 1(7/8)"-12 47.62 47.62 45.845.8-32 2(1/2)"-12 2(1/2)"-12 63.5 63.5 61.67英制圆柱管螺纹（BSPP ）常用规格 -4 1/4”-19 1/4”-19 13.157 13.157 11.55-6 3/8”-19 3/8”-19 16.662 16.662 14.9514.95-8 1/2”-14 1/2”-14 20.955 20.955 18.6318.63 -12 3/4”-14 3/4”-14 26.441 26.441 24.11-16 1”-11 1”-11 33.249 33.249 30.29-20 1(1/4)''-11 1(1/4)''-11 41.91 41.91 38.9538.95英制圆锥管螺纹（BSPT ）常用规格 基面大径基面大径基准距离1/4”-19 1/4”-19 13.157 13.157 663/8”-19 3/8”-19 16.662 16.662 6.46.41/2”-14 1/2”-14 20.955 20.955 8.28.23/4”-14 3/4”-14 26.441 26.441 9.59.51”-11 1”-11 33.249 33.249 10.410.41(1/4)''-11 1(1/4)''-11 41.91 41.91 12.712.7美制圆锥管螺纹（NPT ）1/8”-27 1/8”-27 10.24 10.24 441/4”-18 1/4”-18 13.60 13.60 443/8”-18 3/8”-18 17.04 17.04 4.324.321/2”-14 1/2”-14 21.22 21.22 4.484.483/4”-14 3/4”-14 26.57 26.57 4.754.751”-11(1/2)” 1”-11(1/2)” 33.22 33.22 4.64.61(1/4)”-11.5 1(1/4)”-11.5 41.96 41.96 4.834.83。