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美制螺纹标准对照表

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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。

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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

美制螺纹标准对照表

9/16-18
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

美制统一螺纹表UNC,UNF

001212公制对照表mm基本中经d2d2内螺纹基本小径d1unr外螺纹设计牙型小径d3参考公称直径基本大经ddin牙数n系列代号第1页共54页中经公差容隙es基本大经dd内小径d1外小径d3螺距p2a1a和2a公制对照表mm基本中经d2d2内螺纹基本小径d1unr外螺纹设计牙型小径d3参考公称直径基本大经ddin牙数n系列代号5160
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(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。