美制螺纹标准对照表
美制螺纹标准对照表
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
5/8-18
3/4-16
7/8-14
1"-12
1.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：10-32UNF-2B(或、3/8-24UNF-2B(或
精心搜集整理，只为你的需要
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。
2.标记示例：10-24UNC-2A(或、3/8-16UNC-2A(或
（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
2.标记示例：10-24UNC-2B(或、3/8-16UNC-2B(或
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ຫໍສະໝຸດ 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
8-36
UNF
10-32
12-28
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
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
8-32
UNC
10-24
12-24
1/4-20
5/16-18
3/8-16
7/16-14
美制统一螺纹表UNC,UNF
第 2 页，共 45 页
美制标准系列统一螺
公称 基本大经 牙数 系列 直径 D，d(in) n 代号 9/16 0.5625 9/16 0.5625 5/8 5/8 5/8 5/8 5/8 5/8 5/8 5/8 0.6250 0.6250 0.6250 0.6250 0.6250 0.6250 0.6250 0.6250 28 32 11 12 16 18 20 24 28 32 12 16 20 24 28 32 10 12 16 20 28 32 12 16 UN UN UNC UN UN UNF UN UNEF UN UN UN UN UN UNEF UN UN UNC UN UNF UNEF UN UN UN UN 基本中经 D2，d2 0.5393 0.5422 0.5660 0.5709 0.5844 0.5889 0.5925 0.5979 0.6018 0.6047 0.6334 0.6469 0.6550 0.6604 0.6643 0.6672 0.6850 0.6959 0.7094 0.7175 0.7268 0.7297 0.7584 0.7719 UNR外螺纹设 内螺纹基本小 计牙型小径 径D1 d3(参考) 0.5238 0.5287 0.5266 0.5348 0.5573 0.5649 0.5709 0.5799 0.5863 0.5912 0.5973 0.6198 0.6334 0.6424 0.6488 0.6537 0.6417 0.6598 0.6823 0.6959 0.7113 0.7162 0.7223 0.7448 0.5187 0.5242 0.5135 0.5228 0.5483 0.5568 0.5637 0.5739 0.5812 0.5867 0.5853 0.6108 0.6262 0.6364 0.6437 0.6492 0.6273 0.6478 0.6733 0.6887 0.7062 0.7117 0.7103 0.7358 公制对照表(mm) 基本大经 D，d 14.2875 14.2875 15.8750 15.8750 15.8750 15.8750 15.8750 15.8750 15.8750 15.8750 17.4625 17.4625 17.4625 17.4625 17.4625 17.4625 19.0500 19.0500 19.0500 19.0500 19.0500 19.0500 20.6375 20.6375 (内)小径D1 13.3055 13.4282 13.3753 13.5836 14.1565 14.3474 14.5002 14.7293 14.8930 15.0157 15.1711 15.7440 16.0877 16.3168 16.4805 16.6032 16.3004 16.7586 17.3315 17.6752 18.0680 18.1907 18.3461 18.9190 (外)小径d3 13.3055 13.4282 13.3753 13.5836 14.1565 14.3474 14.5002 14.7293 14.8930 15.0157 15.1711 15.7440 16.0877 16.3168 16.4805 16.6032 16.3004 16.7586 17.3315 17.6752 18.0680 18.1907 18.3461 18.9190 螺距P 0.9071 0.7938 2.3091 2.1167 1.5875 1.4111 1.2700 1.0583 0.9071 0.7938 2.1167 1.5875 1.2700 1.0583 0.9071 0.7938 2.5400 2.1167 1.5875 1.2700 0.9071 0.7938 2.1167 1.5875 中经公差 容隙 2A 0.003715 0.003521 0.005501 0.005443 0.004769 0.004652 0.004324 0.004004 0.003759 0.003565 0.005485 0.004811 0.004366 0.004046 0.003801 0.003607 0.005894 0.005524 0.005024 0.004405 0.003840 0.003646 0.005561 0.004887 es 1A和2A 0.001115 0.001056 0.001650 0.001633 0.001431 0.001396 0.001297 0.001201 0.001128 0.001070 0.001646 0.001443 0.001310 0.001214 0.001140 0.001082 0.001768 0.001657 0.001507 0.001322 0.001152 0.001094 0.001668 0.001466
美制螺纹标准对照表(精品)
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。
美制螺纹尺寸
美制螺纹尺寸,美制螺纹尺寸表美制粗牙螺纹(NRT)(单位：mm)螺纹尺寸2B级螺纹用下孔径 3B级螺纹用下孔径RH精度最小～最大(嵌合率％)RH精度最小～最大(嵌合率％)NO. 2-56UNC4 1.96 ~ 2.02 (100~65) 3 1.95 ~ 2.01 (100~65) 3-48 4 2.25 ~ 2.32 (100~65) 3 2.23 ~ 2.31 (100~65) 4-40 5 2.52 ~ 2.60 (100~70) 3 2.50 ~ 2.58 (100~70) 5-40 5 2.86 ~ 2.93 (100~70) 3 2.83 ~ 2.91 (100~70) 6-32 5 3.09 ~ 3.17 (100~75) 3 3.06 ~ 3.14 (100~75) 8-32 6 3.75 ~ 3.83 (100~75) 4 3.74 ~ 3.82 (100~75) 10-24 6 4.26 ~ 4.35 (100~80) 4 4.24 ~ 4.32 (100~80) 12-24 6 4.92 ~ 5.01 (100~80) 4 4.90 ~ 4.96 (100~85) 1/4 -20 6 5.66 ~ 5.76 (100~80) 4 5.64 ~ 5.74 (100~80) 5/16 -18 7 7.18 ~ 7.29 (100~80) 5 7.15 ~ 7.24 (100~85) 3/8 -16 7 8.66 ~ 8.78 (100~80) 5 8.63 ~ 8.73 (100~85) 7/16 -14 7 10.11 ~10.25 (100~80) 5 10.08 ~10.19 (100~85) 1/2 -13 8 10.62 ~11.78 (100~80) 6 11.60 ~11.68 (100~90) 9/16 -12 10 13.14 ~13.27 (100~85) 8 13.11 ~13.24 (100~85) 5/8 -11 11 14.62 ~14.76 (100~85) 8 14.58 ~14.67 (100~90) 3/4 -10 12 17.67 ~17.88 (100~80) 9 17.63 ~17.74 (100~90) 7/8 - 9 12 20.68 ~20.85 (100~85) 9 20.64 ~20.75 (100~90) 1 - 8 13 23.65 ~23.84 (100~85) 10 23.61 ~23.74 (100~90) 美制细牙螺纹(NRT)(单位：mm)螺纹尺寸2B级螺纹用下孔径 3B级螺纹用下孔径RH精度最小～最大(嵌合率％)RH精度最小～最大(嵌合率％)NO. 2-64UNF 3 1.98 ~ 2.04 (100~65) 2 1.97 ~ 2.03 (100~65)3-56 4 2.29 ~ 2.35 (100~65) 3 2.28 ~ 2.34 (100~65) 4-48 4 2.57 ~ 2.64 (100~70) 3 2.56 ~ 2.63 (100~70) 5-44 4 2.88 ~ 2.95 (100~70) 3 2.87 ~ 2.94 (100~70) 6-40 5 3.19 ~ 3.26 (100~70) 3 3.16 ~ 3.22 (100~75) 8-36 5 3.80 ~ 3.88 (100~75) 4 3.79 ~ 3.86 (100~75) 10-32 5 4.41 ~ 4.48 (100~80) 4 4.40 ~ 4.46 (100~80) 12-28 5 5.00 ~ 5.08 (100~80) 4 4.99 ~ 5.06 (100~80) 1/4 -28 5 5.86 ~ 5.93 (100~80) 4 5.85 ~ 5.92 (100~80) 5/16-24 6 7.38 ~ 7.46 (100~80) 5 7.36 ~ 7.43 (100~85) 3/8 -24 6 8.96 ~ 9.05 (100~80) 5 8.95 ~ 9.02 (100~85) 7/16-20 7 10.44 ~10.54 (100~80) 5 10.41 ~10.49 (100~85) 1/2 -20 7 12.02 ~12.12 (100~80) 5 12.00 ~12.05 (100~90) 9/16-18 9 13.55 ~13.66 (100~80) 7 13.53 ~13.58 (100~90) 5/8 -18 9 15.14 ~15.25 (100~80) 7 15.11 ~15.17 (100~90) 3/4 -16 10 18.22 ~18.32 (100~85) 7 18.18 ~18.25 (100~90) 7/8 -14 11 21.27 ~21.38 (100~85) 8 21.23 ~21.27 (100~95) 1 - 12 12 24.28 ~24.41 (100~85) 9 24.24 ~24.32 (100~90)美制粗牙螺纹(单位：mm)钻头直螺纹尺寸下孔径径最小直径最大直径NO. 2 –56UNC 2.29 2.39 2.33 –48 2.64 2.74 2.74 –40 2.95 3.07 3.05 –40 3.25 3.38 3.36 –32 3.66 3.81 3.78 –32 4.32 4.47 4.410 –24 5.05 5.21 5.112 –24 5.61 5.77 5.71/4 –20 6.63 6.78 6.75/16 –8 8.33 8.48 8.43/8 –16 9.91 10.11 10.07/16 –14 11.51 11.76 11.51/2 –13 13.08 13.34 13.19/16 –12 14.68 14.94 14.7美制细牙螺纹(单位：mm)钻头直螺纹尺寸下孔径径最小直径最大直径NO. 4 –48UNF 2.97 3.05 3.06 –40 3.66 3.78 3.78 –36 4.32 4.44 4.410 –32 4.98 5.13 5.01/4 –28 6.53 6.71 6.65/16 –24 8.20 8.38 8.23/8 –24 9.78 9.96 9.87/16 –20 11.43 11.63 11.51/2 –20 13.03 13.26 13.19/16 –18 14.66 14.88 14.75/8 –18 16.26 16.48 16.33/4 –16 19.43 19.68 19.57/8 –14 22.61 22.86 22.71 –12 25.76 26.04 26.0美制管螺纹尺寸表一览：用螺纹密封的管螺纹基本尺寸(R)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离有效螺纹长度大径小径1/16 28 0.907 7.723 6.561 4.0 6.51/8 28 0.907 9.728 8.566 4.0 6.51/4 19 1.337 13.157 11.445 6.0 9.73/8 19 1.337 16.662 14.950 6.4 10.11/2 14 1.814 20.955 18.631 8.2 13.23/4 14 1.814 26.441 24.117 9.5 14.51 11 2.309 33.249 30.291 10.4 16.81¼11 2.309 41.910 38.952 12.7 19.11½11 2.309 47.803 44.845 12.7 19.12 11 2.309 59.614 56.656 15.9 23.42½11 2.309 75.184 72.226 17.5 26.73 11 2.309 87.884 84.926 20.6 29.83½11 2.309 100.330 97.372 22.2 31.44 11 2.309 113.030 110.072 25.4 35.85 11 2.309 138.430 135.472 28.6 40.16 11 2.309 163.830 160.872 28.6 40.1R—密封用管螺纹：Rc-圆锥内螺纹Rp-圆柱内螺纹R-圆锥外螺纹G—非密封用管螺纹60°圆锥管螺纹基本尺寸(NPT)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离装配余量(牙数) 大径小径。
美制螺纹标准对照表
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。
美制螺纹大全
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
5/8-18
3/4-16
7/8-14
1"-12
1.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：10-32UNF-2B(或、3/8-24UNF-2B(或
2.标记示例：10-24UNC-2B(或、3/8-16UNC-2B(或
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
8-36
UNF
10-32
12-28
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
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
8-32
UNC
/16-18
3/8-16
7/16-14
1/2-13
9/16-12
5/8-11
3/4-10
7/8-9
1"-8
1.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。
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。
2.标记示例：10-24UNC-2A(或、3/8-16UNC-2A(或
（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。
美制螺纹标准对照表
14.3358
13.0023
3/4-10
0.7353
0.7482
0.6773
0.6832
0.6255
17.28
17.33
(0.750-10)
18.6766
19.0043
17.2034
17.3533
15.8877
7/8-9
0.8592
0.8731
0.7946
0.8009
0.7368
20.27
7.6860
7.9070
6.8885
6.9901
6.1747
3/8-16
0.3643
0.3737
0.3287
0.3331
0.2970
8.40
8.44
(0.375-16)
9.2532
9.4920
8.3490
8.4607
7.5438
7/16-14
0.4258
0.4361
0.3850
0.3897
0.3485
19.60
(0.875-9)
19.1770
19.7612
20.3911
20.5994
22.2250
1"-8
0.8650
0.8900
0.9188
0.9276
1.0000
22.10
22.40
(1.000-8)
21.9710
22.6060
23.3375
23.5610
25.4000
1.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。
0.1460
0.1496
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最小最大最小最大最小最大 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)12.38512.661911.264911.391910.26419/16/20120.54950.56090.50160.50680.4587(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4.14.72 4.755.45 5.486.94 6.988.48.449.839.8711.3411.3812.812.8414.2714.3217.2817.3320.2720.3223.2223.271.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)UNC3.58 3.614.07（注：表中上行斜体数值单位为英寸，下行为毫米）美制螺纹标准对照表最小最大最小最大最小最大 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(0.216‐28) 5.2959 5.461 4.7904 4.8717 4.3485 1/4‐280.24250.2490.22250.22580.2052(0.250‐28) 6.1595 6.3246 5.6515 5.7353 5.2121 5/16‐240.30420.31140.28060.28430.2603(0.3175‐24)7.72677.90967.12727.2212 6.6116 3/8‐240.36670.37390.3430.34680.3228(0.375‐24)9.31429.49718.71228.80878.1991 7/16‐200.42810.43620.39950.40370.3749(0.4375‐20)10.873711.079510.147310.2549.5225 1/2‐200.49060.49870.46190.46620.4374(0.50‐20)12.461212.66711.732311.841511.119/16/20180.55240.56110.52050.5250.4929(0.5625‐18)14.03114.251913.220713.33512.5197 5/8‐180.61490.62360.58280.58750.5554(0.625‐18)15.618515.839414.803114.922514.1072 3/4‐160.73910.74850.70290.70790.6718(0.750‐16)18.773119.011917.853717.980717.0637 7/8‐140.86310.87340.82160.8270.7858(0.875‐14)21.922722.184420.868621.005819.95931"‐120.98680.99820.93820.94410.896(1.000‐12)25.064725.354323.830323.980122.7584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4.274.82 4.855.69 5.717.177.28.758.7810.1910.2311.7811.8213.2713.3114.8514.8917.9117.9520.9320.9723.923.951.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)UNF3.65 3.674.24最小最大最小最大最小最大 8‐320.130.1390.14370.14750.164(0.164‐32) 3.302 3.5306 3.65 3.7465 4.1656 10‐240.1450.1560.16290.16720.19(0.190‐24) 3.683 3.9624 4.1377 4.2469 4.826 12‐240.1710.1810.18890.19330.216(0.216‐24) 4.3434 4.5974 4.7981 4.9098 5.4864 1/4‐200.1960.2070.21750.22240.25(0.250‐20) 4.9784 5.2578 5.5245 5.649 6.35 5/16‐180.2520.2650.27640.28170.3125(0.3175‐18) 6.4008 6.7317.02067.15527.9375 3/8‐160.3070.3210.33440.34010.375(0.375‐16)7.79788.15348.49388.63859.525 7/16‐140.360.3760.39110.39720.4375(0.4375‐14)9.1449.55049.933910.088911.11251/2‐130.4170.4340.450.45650.5(0.50‐13)10.591811.023611.4311.595112.79/16/20120.4720.490.50840.51520.5625(0.5625‐12)11.988812.44612.913413.086114.2875 5/8‐110.5270.5460.5660.57320.625(0.625‐11)13.385813.868414.376414.559315.875 3/4‐100.6420.6630.6850.69270.75(0.750‐10)16.306816.840217.39917.594619.05 7/8‐90.7550.7780.80280.8110.875(0.875‐9)19.17719.761220.391120.599422.2251"‐80.8650.890.91880.92761(1.000‐8)21.97122.60623.337523.56125.4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3.94.4 4.555.05 5.26.45 6.67.8589.29.410.6510.912.0512.313.4513.716.416.719.319.622.122.41.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)UNC3.4 3.53.75最小最大最小最大最小最大 8‐360.1340.1420.1460.14960.164(0.164‐36) 3.4036 3.6068 3.7084 3.7998 4.165610‐320.1560.1640.16970.17360.19(0.190‐32) 3.9624 4.1656 4.3104 4.4094 4.82612‐280.1770.1860.19280.1970.216(0.216‐28) 4.4958 4.7244 4.8971 5.0038 5.48641/4‐280.2110.220.22680.23110.25 (0.250‐28) 5.3594 5.588 5.7607 5.8699 6.35 5/16‐240.2670.2770.28540.29020.3125 (0.3175‐24) 6.78187.03587.24927.37117.9375 3/8‐240.330.340.34790.35280.375 (0.375‐24)8.3828.6368.83678.96119.525 7/16‐200.3830.3950.4050.41040.4375 (0.4375‐20)9.728210.03310.28710.424211.1125 1/2‐200.4460.4570.46750.47310.5 (0.50‐20)11.328411.607811.874512.016712.7 9/16/20180.5020.5150.52640.53230.5625 (0.5625‐18)12.750813.08113.370613.520414.2875 5/8‐180.5650.5780.58890.59490.625 (0.625‐18)14.35114.681214.958115.110515.875 3/4‐160.6820.6960.70940.71590.75 (0.750‐16)17.322817.678418.018818.183919.05 7/8‐140.7980.8140.82860.83560.875 (0.875‐14)20.269220.675621.046421.224222.2251"‐120.910.9280.94590.95351 (1.000‐12)23.11423.571224.025924.218925.45.4 5.716.85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10.2311.411.82UNF3.45 3.674 4.274.55 4.852.标记示例：10‐32UNF‐2B(或0.190‐32UNF‐2B)、3/8‐24UNF‐2B(或0.375‐24UNF‐2B)12.8513.31 14.4514.89 17.417.95 20.3520.97 23.923.951.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。