公制美制螺纹标准数据库 UNS

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公制、美制螺纹标准数据库-UNS

InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmm3310–28 UNS 2A 0.00100.02540.1890 4.80060.1825 4.6355——0.1658 4.21130.1625 4.12750.1464 3.71862B 0.1510 3.83540.1600 4.06400.1668 4.23670.1711 4.34590.1900 4.82603610–36 UNS 2A 0.00090.02290.1891 4.80310.1836 4.6634——0.1711 4.34590.1681 4.26970.1560 3.96242B 0.1600 4.06400.1660 4.21640.1720 4.36880.1759 4.46790.1900 4.82603710–40 UNS 2A 0.00090.02290.1891 4.80310.1840 4.6736——0.1729 4.39170.1700 4.31800.1592 4.04372B 0.1630 4.14020.1690 4.29260.1738 4.41450.1775 4.50850.1900 4.82603810–48 UNS 2A 0.00080.02030.1892 4.80570.1847 4.6914——0.1757 4.46280.1731 4.39670.1644 4.17582B 0.1670 4.24180.1720 4.36880.1765 4.48310.1799 4.56950.1900 4.82603910–56 UNS2A0.00070.01780.18934.80820.18524.7041——0.17774.51360.17524.45010.16814.26972B0.17104.34340.17504.44500.17844.53140.18164.61260.19004.8260No.MaxMinor DiameterMinMaxPitch Diameter Major Diameter MinMin eMajor DiameterUNR Minor Dia.,c Max (Ref.)Max dMinMinPitch DiameterNominal Size,Threads perInch,and Series Designation aClassClassMax dMinAllowanceInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmNo.Standard Series and Selected Combinations- Unified Screw ThreadsMaxMinor DiameterMinMaxPitch Diameter Major Diameter MinMineMajor DiameterUNR Minor Dia.,c Max (Ref.)MaxdMinMinPitch DiameterNominal Size,Threads perInch,and Series Designation aClassClassMaxdMinAllowanceInternal bExternal b4612–36 UNS 2A 0.00090.02290.2151 5.46350.2096 5.3238——0.1971 5.00630.1941 4.93010.1821 4.62532B 0.1860 4.72440.1920 4.87680.1980 5.02920.2019 5.12830.2160 5.48644712–40 UNS 2A 0.00090.02290.2151 5.46350.2100 5.3340——0.1989 5.05210.1960 4.97840.1835 4.66092B 0.1890 4.80060.1950 4.95300.1998 5.07490.2035 5.16890.2160 5.48644812–48 UNS 2A 0.00080.02030.2152 5.46610.2107 5.3518——0.2017 5.12320.1991 5.05710.1904 4.83622B 0.1930 4.90220.1980 5.02920.2025 5.14350.2059 5.22990.2160 5.48644912–56 UNS 2A 0.00070.01780.2153 5.46860.2112 5.3645——0.2037 5.17400.2012 5.11050.1941 4.93012B 0.1970 5.00380.2010 5.10540.2044 5.19180.2076 5.27300.2160 5.4864531⁄4–24 UNS 2A 0.00110.02790.2489 6.32210.2417 6.1392——0.2218 5.63370.2181 5.53970.1993 5.06222B 0.2050 5.20700.2150 5.46100.2229 5.66170.2277 5.78360.2500 6.3500541⁄4–27 UNS 2A 0.00100.02540.2490 6.32460.2423 6.1544——0.2249 5.71250.2214 5.62360.2049 5.20452B 0.2100 5.33400.2190 5.56260.2259 5.73790.2304 5.85220.2500 6.3500601⁄4–36 UNS 2A 0.00090.02290.2491 6.32710.2436 6.1874——0.2311 5.86990.2280 5.79120.2161 5.48892B 0.2200 5.58800.2260 5.74040.2320 5.89280.2360 5.99440.2500 6.3500611⁄4–40 UNS 2A 0.00090.02290.2491 6.32710.2440 6.1976——0.2329 5.91570.2300 5.84200.2193 5.57022B 0.2230 5.66420.2290 5.81660.2338 5.93850.2376 6.03500.2500 6.3500621⁄4–48 UNS 2A 0.00080.02030.2492 6.32970.2447 6.2154——0.2357 5.98680.2330 5.91820.2243 5.69722B 0.2270 5.76580.2320 5.89280.2365 6.00710.2401 6.09850.2500 6.3500631⁄4–56 UNS 2A 0.00080.02030.2492 6.32970.2451 6.2255——0.2376 6.03500.2350 5.96900.2280 5.79122B 0.2310 5.86740.2350 5.96900.2384 6.05540.2417 6.13920.2500 6.3500725⁄16–27 UNS 2A 0.00100.02540.31157.91210.30487.7419——0.28747.30000.28397.21110.2674 6.79202B 0.2720 6.90880.28107.13740.28847.32540.29297.43970.31257.9375775⁄16–36 UNS 2A 0.00090.02290.31167.91460.30617.7749——0.29367.45740.29057.37870.27857.07392B 0.28207.16280.28907.34060.29457.48030.29857.58190.31257.9375785⁄16–40 UNS 2A 0.00090.02290.31167.91460.30657.7851——0.29547.50320.29257.42950.28187.15772B 0.28507.23900.29107.39140.29637.52600.30017.62250.31257.9375795⁄16–48 UNS 2A 0.00080.02030.31177.91720.30727.8029——0.29827.57430.29557.50570.28697.28732B 0.29007.36600.29507.49300.29907.59460.30267.68600.31257.9375833⁄8–18 UNS2A0.00130.03300.37379.49200.36509.2710——0.33768.57500.33338.46580.30767.81302B0.31508.00100.32808.33120.33898.60810.34458.75030.37509.5250InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmNo.MaxMinor DiameterMinMaxPitch Diameter Major Diameter MinMin eMajor DiameterUNR Minor Dia.,c Max (Ref.)Max dMinMinPitch DiameterNominal Size,Threads perInch,and Series Designation aClassClassMax dMinAllowance893⁄8–27 UNS 2A 0.00110.02790.37399.49710.36729.3269——0.34988.88490.34628.79350.32988.37692B 0.33508.50900.34408.73760.35098.91290.35569.03220.37509.5250943⁄8–36 UNS 2A 0.00100.02540.37409.49960.36859.3599——0.35609.04240.35288.96110.34098.65892B 0.34508.76300.35208.94080.35709.06780.36129.17450.37509.5250953⁄8–40 UNS 2A 0.00090.02290.37419.50210.36909.3726——0.35799.09070.35489.01190.34438.74522B 0.34808.83920.35408.99160.35889.11350.36289.21510.37509.5250960.390–27 UNS 2A 0.00110.02790.38899.87810.38229.7079——0.36489.26590.36129.17450.34488.75792B 0.35008.89000.35909.11860.36599.29390.37069.41320.39009.90601027⁄16–18 UNS 2A 0.00130.03300.436211.07950.427510.8585——0.400110.16250.395810.05330.37019.40052B 0.37709.57580.39009.90600.401410.19560.407010.33780.437511.11251067⁄16–24 UNS 2A 0.00110.02790.436411.08460.429210.9017——0.409310.39620.405510.29970.38689.82472B 0.39209.95680.402010.21080.410410.42420.415310.54860.437511.11251077⁄16–27 UNS 2A 0.00110.02790.436411.08460.429710.9144——0.412310.47240.408710.38100.39239.96442B 0.397010.08380.406010.31240.413410.50040.418110.61970.437511.11251121⁄2–12 UNS 2A 0.00160.04060.498412.65940.487012.3698——0.444311.28520.438911.14810.399210.13972B 0.410010.41400.428010.87120.445911.32590.452911.50370.500012.70001131⁄2–12 UNS 3A 0.00000.00000.500012.70000.488612.4104——0.445911.32590.441911.22430.400810.18033B 0.410010.41400.422310.72640.445911.32590.451111.45790.500012.70001171⁄2–14 UNS 2A 0.00150.03810.498512.66190.488212.4003——0.452111.48330.447111.35630.413510.50292B 0.423010.74420.438011.12520.453611.52140.460111.68650.500012.70001201⁄2–18 UNS 2A 0.00130.03300.498712.66700.490012.4460——0.462611.75000.458211.63830.432610.98802B 0.440011.17600.453011.50620.463911.78310.469711.93040.500012.70001241⁄2–24 UNS 2A 0.00120.03050.498812.66950.491612.4866——0.471711.98120.467811.88210.449211.40972B 0.455011.55700.465011.81100.472912.01170.478012.14120.500012.70001251⁄2–27 UNS 2A 0.00110.02790.498912.67210.492212.5019——0.474812.05990.471111.96590.454811.55192B 0.460011.68400.469011.91260.475912.08790.480712.20980.500012.70001339⁄16–14 UNS 2A 0.00150.03810.561014.24940.550713.9878——0.514613.07080.509612.94380.476012.09042B 0.485012.31900.501012.72540.516113.10890.522613.27400.562514.28751439⁄16–27 UNS 2A 0.00110.02790.561414.25960.554714.0894——0.537313.64740.533613.55340.517313.13942B 0.522013.25880.531013.48740.538413.67540.543213.79730.562514.28751535⁄8–14 UNS 2A 0.00150.03810.623515.83690.613215.5753——0.577114.65830.572014.52880.538513.67792B 0.548013.91920.564014.32560.578614.69640.585214.86410.625015.87501635⁄8–27 UNS 2A 0.00110.02790.623915.84710.617215.6769——0.599815.23490.596015.13840.579814.72692B 0.585014.85900.594015.08760.600915.26290.605915.38990.625015.87501853⁄4–14 UNS 2A 0.00150.03810.748519.01190.738218.7503——0.702117.83330.697017.70380.663516.85292B 0.673017.09420.688017.47520.703617.87140.710318.04160.750019.05001893⁄4–18 UNS 2A 0.00140.03560.748619.01440.739918.7935——0.712518.09750.707917.98070.682517.33552B 0.690017.52600.703017.85620.713918.13310.719918.28550.750019.05001923⁄4–24 UNS 2A 0.00120.03050.748819.01950.741618.8366——0.721718.33120.717618.22700.699217.75972B 0.705017.90700.715018.16100.722918.36170.728218.49630.750019.05001933⁄4–24 UNS 2A 0.00120.03050.748819.01950.742118.8493——0.724718.40740.720818.30830.704717.89942B 0.710018.03400.719018.26260.725918.43790.731018.56740.750019.05002117⁄8–10 UNS 2A 0.00180.04570.873222.17930.860321.8516——0.808220.52830.802220.37590.754219.15672B 0.767019.48180.788020.01520.810020.57400.817820.77210.875022.22502197⁄8–18 UNS 2A 0.00140.03560.873622.18940.864921.9685——0.837521.27250.832921.15570.807520.51052B 0.815020.70100.828021.03120.838921.30810.844921.46050.875022.22502227⁄8–24 UNS 2A 0.00120.03050.873822.19450.866622.0116——0.846721.50620.842621.40200.824220.93472B 0.830021.08200.840021.33600.847921.53670.853221.67130.875022.22502237⁄8–27 UNS 2A 0.00120.03050.873822.19450.867122.0243——0.849721.58240.845821.48330.829721.07442B 0.835021.20900.844021.43760.850921.61290.856021.74240.875022.22502411–10 UNS 2A 0.00180.04570.998225.35430.985325.0266——0.933223.70330.927023.54580.879222.33172B 0.892022.65680.913023.19020.935023.74900.943023.9522 1.000025.40002501–18 UNS 2A 0.00140.03560.998625.36440.989925.1435——0.962524.44750.957824.32810.932523.68552B 0.940023.87600.953024.20620.963924.48310.970124.6405 1.000025.40002531–24 UNS 2A 0.00130.03300.998725.36700.991525.1841——0.971624.67860.967424.57200.949124.10712B 0.955024.25700.965024.51100.972924.71170.978424.8514 1.000025.40002541–27 UNS 2A 0.00120.03050.998825.36950.992125.1993——0.974724.75740.970724.65580.954724.24942B 0.960024.38400.969024.61260.975924.78790.981124.9199 1.000025.400027611⁄8–10 UNS 2A 0.00180.0457 1.123228.5293 1.110328.2016—— 1.058226.8783 1.052026.7208 1.004225.50672B 1.017025.8318 1.038026.3652 1.060026.9240 1.068027.1272 1.125028.575028011⁄8–14 UNS 2A 0.00160.0406 1.123428.5344 1.113128.2727—— 1.077027.3558 1.071727.2212 1.038426.37542B 1.048026.6192 1.064027.0256 1.078627.3964 1.085527.5717 1.125028.575028711⁄8–24 UNS 2A 0.00130.0330 1.123728.5420 1.116528.3591—— 1.096627.8536 1.092427.7470 1.074227.28472B 1.080027.4320 1.090027.6860 1.097927.8867 1.103428.0264 1.125028.575030711⁄4–10 UNS 2A 0.00190.0483 1.248131.7017 1.235231.3741—— 1.183130.0507 1.176829.8907 1.129128.67912B 1.142029.0068 1.163029.5402 1.185030.0990 1.193230.3073 1.250031.750031111⁄4–14 UNS 2A 0.00160.0406 1.248431.7094 1.238131.4477—— 1.202030.5308 1.196630.3936 1.163429.55042B 1.173029.7942 1.188030.1752 1.203630.5714 1.210630.7492 1.250031.750031811⁄4–24 UNS 2A 0.00130.0330 1.248731.7170 1.241531.5341—— 1.221631.0286 1.217330.9194 1.199130.45712B 1.205030.6070 1.215030.8610 1.222931.0617 1.228531.2039 1.250031.750033813⁄8–10 UNS 2A 0.00190.0483 1.373134.8767 1.360234.5491—— 1.308133.2257 1.301833.0657 1.254131.85412B 1.267032.1818 1.288032.7152 1.310033.2740 1.318233.4823 1.375034.925034213⁄8–14 UNS 2A 0.00160.0406 1.373434.8844 1.363134.6227—— 1.327033.7058 1.321633.5686 1.288432.72542B 1.298032.9692 1.314033.3756 1.328633.7464 1.335633.9242 1.375034.925034913⁄8–24 UNS 2A 0.00130.0330 1.373734.8920 1.366534.7091—— 1.346634.2036 1.342334.0944 1.324133.63212B 1.330033.7820 1.340034.0360 1.347934.2367 1.353534.3789 1.375034.925037111⁄2–10 UNS 2A 0.00190.0483 1.498138.0517 1.485237.7241—— 1.433136.4007 1.426736.2382 1.379135.02912B 1.392035.3568 1.413035.8902 1.435036.4490 1.443336.6598 1.500038.100037511⁄2–14 UNS 2A 0.00170.0432 1.498338.0568 1.488037.7952—— 1.451936.8783 1.446436.7386 1.413335.89782B 1.423036.1442 1.438036.5252 1.453636.9214 1.460837.1043 1.500038.100038211⁄2–24 UNS 2A 0.00130.0330 1.498738.0670 1.491537.8841—— 1.471637.3786 1.467237.2669 1.449136.80712B 1.455036.9570 1.465037.2110 1.472937.4117 1.478737.5590 1.500038.100040115⁄8–10 UNS 2A 0.00190.0483 1.623141.2267 1.610240.8991—— 1.558139.5757 1.551739.4132 1.504138.20412B 1.517038.5318 1.538039.0652 1.560039.6240 1.568339.8348 1.625041.275040415⁄8–14 UNS 2A 0.00170.0432 1.623341.2318 1.613040.9702—— 1.576940.0533 1.571439.9136 1.538339.07282B 1.548039.3192 1.564039.7256 1.578640.0964 1.585840.2793 1.625041.275041115⁄8–24 UNS 2A 0.00130.0330 1.623741.2420 1.616541.0591—— 1.596640.5536 1.592240.4419 1.574139.98212B 1.580040.1320 1.590040.3860 1.597940.5867 1.603740.7340 1.625041.275043113⁄4–10 UNS 2A 0.00190.0483 1.748144.4017 1.735244.0741—— 1.683142.7507 1.676642.5856 1.629141.37912B 1.642041.7068 1.663042.2402 1.685042.7990 1.693443.0124 1.750044.450043413⁄4–14 UNS2A0.00170.04321.748344.40681.738044.1452——1.701943.22831.696343.08601.663242.24532B1.673042.49421.688042.87521.703643.27141.710943.45691.750044.4500InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmNo.MaxMinor DiameterMinMaxPitch Diameter Major Diameter MinMin eMajor DiameterUNR Minor Dia.,c Max (Ref.)Max dMinMinPitch DiameterNominal Size,Threads perInch,and Series Designation aClassClassMax dMinAllowance43713⁄4–18 UNS 2A 0.00150.0381 1.748544.4119 1.739844.1909—— 1.712443.4950 1.707343.3654 1.682442.73302B 1.690042.9260 1.703043.2562 1.713943.5331 1.720543.7007 1.750044.450045417⁄8–10 UNS 2A 0.00190.0483 1.873147.5767 1.860247.2491—— 1.808145.9257 1.801645.7606 1.754144.55412B 1.767044.8818 1.788045.4152 1.810045.9740 1.818446.1874 1.875047.625045717⁄8–14 UNS 2A 0.00170.0432 1.873347.5818 1.863047.3202—— 1.826946.4033 1.821346.2610 1.788345.42282B 1.798045.6692 1.814046.0756 1.828646.4464 1.835946.6319 1.875047.625046017⁄8–18 UNS 2A 0.00150.0381 1.873547.5869 1.864847.3659—— 1.837446.6700 1.832346.5404 1.807445.90802B 1.815046.1010 1.828046.4312 1.838946.7081 1.845546.8757 1.875047.62504802–10 UNS 2A 0.00200.0508 1.998050.7492 1.985150.4215—— 1.933049.0982 1.926548.9331 1.879047.72662B 1.892048.0568 1.913048.5902 1.935049.1490 1.943549.3649 2.000050.80004832–14 UNS 2A 0.00170.0432 1.998350.7568 1.988050.4952—— 1.951949.5783 1.946249.4335 1.913348.59782B 1.923048.8442 1.938049.2252 1.953649.6214 1.961049.8094 2.000050.80004862–18 UNS 2A 0.00150.0381 1.998550.7619 1.989850.5409—— 1.962449.8450 1.957349.7154 1.932449.08302B 1.940049.2760 1.953049.6062 1.963949.8831 1.970650.0532 2.000050.800048921⁄16–16 UNS 2A 0.00160.0406 2.060952.3469 2.051552.1081—— 2.020351.3156 2.014951.1785 1.986450.45462B 1.995050.6730 2.009051.0286 2.021951.3563 2.028951.5341 2.062552.387549021⁄16–16 UNS 3A 0.00000.0000 2.062552.3875 2.053152.1487—— 2.021951.3563 2.017951.2547 1.988050.49523B 1.995050.6730 2.003350.8838 2.021951.3563 2.027151.4883 2.062552.387550123⁄16–16 UNS 2A 0.00160.0406 2.185955.5219 2.176555.2831—— 2.145354.4906 2.139954.3535 2.111453.62962B 2.120053.8480 2.134054.2036 2.146954.5313 2.153954.7091 2.187555.562550223⁄16–16 UNS 3A 0.00000.0000 2.187555.5625 2.178155.3237—— 2.146954.5313 2.142854.4271 2.113053.67023B 2.120053.8480 2.128354.0588 2.146954.5313 2.152154.6633 2.187555.562551021⁄4–10 UNS 2A 0.00200.0508 2.248057.0992 2.235156.7715—— 2.183055.4482 2.176555.2831 2.129054.07662B 2.142054.4068 2.163054.9402 2.185055.4990 2.193555.7149 2.250057.150051321⁄4–14 UNS 2A 0.00170.0432 2.248357.1068 2.238056.8452—— 2.201955.9283 2.196255.7835 2.163354.94782B 2.173055.1942 2.188055.5752 2.203655.9714 2.211056.1594 2.250057.150051621⁄4–18 UNS 2A 0.00150.0381 2.248557.1119 2.239856.8909—— 2.212456.1950 2.207356.0654 2.182455.43302B 2.190055.6260 2.203055.9562 2.213956.2331 2.220656.4032 2.250057.150051925⁄16–16 UNS 2A 0.00170.0432 2.310858.6943 2.301458.4556—— 2.270257.6631 2.264757.5234 2.236356.80202B 2.245057.0230 2.259057.3786 2.271957.7063 2.279157.8891 2.312558.737552025⁄16–16 UNS 3A 0.00000.0000 2.312558.7375 2.303158.4987—— 2.271957.7063 2.267857.6021 2.238056.84523B 2.245057.0230 2.253357.2338 2.271957.7063 2.277357.8434 2.312558.737553127⁄16–16 UNS 2A 0.00170.0432 2.435861.8693 2.426461.6306—— 2.395260.8381 2.389760.6984 2.361359.97702B 2.370060.1980 2.384060.5536 2.396960.8813 2.404161.0641 2.437561.912553227⁄16–16 UNS 3A 0.00000.0000 2.437561.9125 2.428161.6737—— 2.396960.8813 2.392860.7771 2.363060.02023B 2.370060.1980 2.378360.4088 2.396960.8813 2.402361.0184 2.437561.912554021⁄2–10 UNS 2A 0.00200.0508 2.498063.4492 2.485163.1215—— 2.433061.7982 2.426361.6280 2.379060.42662B 2.392060.7568 2.413061.2902 2.435061.8490 2.443762.0700 2.500063.500054321⁄2–14 UNS 2A 0.00170.0432 2.498363.4568 2.488063.1952—— 2.451962.2783 2.446162.1309 2.413361.29782B 2.423061.5442 2.438061.9252 2.453662.3214 2.461262.5145 2.500063.500054621⁄2–18 UNS 2A 0.00160.0406 2.498463.4594 2.489763.2384—— 2.462362.5424 2.457062.4078 2.432361.78042B 2.440061.9760 2.453062.3062 2.463962.5831 2.470862.7583 2.500063.500056623⁄4–10 UNS 2A 0.00200.0508 2.748069.7992 2.735169.4715—— 2.683068.1482 2.676367.9780 2.629066.77662B 2.642067.1068 2.663067.6402 2.685068.1990 2.693768.4200 2.750069.850056923⁄4–14 UNS 2A 0.00170.0432 2.748369.8068 2.738069.5452—— 2.701968.6283 2.696168.4809 2.663367.64782B 2.673067.8942 2.688068.2752 2.703668.6714 2.711268.8645 2.750069.850057223⁄4–18 UNS 2A 0.00160.0406 2.748469.8094 2.739769.5884—— 2.712368.8924 2.707068.7578 2.682368.13042B 2.690068.3260 2.703068.6562 2.713968.9331 2.720869.1083 2.750069.85005923–10 UNS 2A 0.00200.0508 2.998076.1492 2.985175.8215—— 2.933074.4982 2.926274.3255 2.879073.12662B 2.892073.4568 2.913073.9902 2.935074.5490 2.943974.7751 3.000076.20005953–14 UNS 2A 0.00180.0457 2.998276.1543 2.987975.8927—— 2.951874.9757 2.945974.8259 2.913273.99532B 2.923074.2442 2.938074.6252 2.953675.0214 2.961375.2170 3.000076.20005983–18 UNS 2A 0.00160.0406 2.998476.1594 2.989775.9384—— 2.962375.2424 2.956975.1053 2.932374.48042B 2.940074.6760 2.953075.0062 2.963975.2831 2.970975.4609 3.000076.200061631⁄4–10 UNS 2A 0.00200.0508 3.248082.4992 3.235182.1715—— 3.183080.8482 3.176280.6755 3.129079.47662B 3.142079.8068 3.163080.3402 3.185080.8990 3.193981.1251 3.250082.550061931⁄4–14 UNS 2A 0.00180.0457 3.248282.5043 3.237982.2427—— 3.201881.3257 3.195981.1759 3.163280.34532B 3.173080.5942 3.188080.9752 3.203681.3714 3.211381.5670 3.250082.550062231⁄4–18 UNS 2A 0.00160.0406 3.248482.5094 3.239782.2884—— 3.212381.5924 3.206981.4553 3.182380.83042B 3.190081.0260 3.203081.3562 3.213981.6331 3.220981.8109 3.250082.550063831⁄2–10 UNS 2A 0.00210.0533 3.497988.8467 3.485088.5190—— 3.432987.1957 3.426087.0204 3.378985.82412B 3.392086.1568 3.413086.6902 3.435087.2490 3.444087.4776 3.500088.900064131⁄2–14 UNS 2A 0.00180.0457 3.498288.8543 3.487988.5927—— 3.451887.6757 3.445787.5208 3.413286.69532B 3.423086.9442 3.438087.3252 3.453687.7214 3.461587.9221 3.500088.900064431⁄2–18 UNS 2A 0.00170.0432 3.498388.8568 3.489688.6358—— 3.462287.9399 3.456787.8002 3.432287.17792B 3.440087.3760 3.453087.7062 3.463987.9831 3.471188.1659 3.500088.900066033⁄4–10 UNS 2A 0.00210.0533 3.747995.1967 3.735094.8690—— 3.682993.5457 3.676093.3704 3.628992.17412B 3.642092.5068 3.663093.0402 3.685093.5990 3.694093.8276 3.750095.250066333⁄4–14 UNS 2A 0.00180.0457 3.748295.2043 3.737994.9427—— 3.701894.0257 3.695793.8708 3.663293.04532B 3.673093.2942 3.688093.6752 3.703694.0714 3.711594.2721 3.750095.250066633⁄4–18 UNS 2A 0.00170.0432 3.748395.2068 3.739694.9858—— 3.712294.2899 3.706794.1502 3.682293.52792B 3.690093.7260 3.703094.0562 3.713994.3331 3.721194.5159 3.750095.25006824–10 UNS 2A 0.00210.0533 3.9979101.5467 3.9850101.2190—— 3.932999.8957 3.925999.7179 3.876898.47072B 3.892098.8568 3.913099.3902 3.935099.9490 3.9441100.1801 4.0000101.60006854–14 UNS 2A 0.00180.0457 3.9982101.5543 3.9879101.2927—— 3.9518100.3757 3.9456100.2182 3.913299.39532B 3.923099.6442 3.9380100.0252 3.9536100.4214 3.9616100.6246 4.0000101.600068841⁄4–10 UNS 2A 0.00210.0533 4.2479107.8967 4.2350107.5690—— 4.1829106.2457 4.1759106.0679 4.1289104.87412B 4.1420105.2068 4.1630105.7402 4.1850106.2990 4.1941106.5301 4.2500107.950068941⁄4–14 UNS 2A 0.00180.0457 4.2482107.9043 4.2379107.6427—— 4.2018106.7257 4.1956106.5682 4.1632105.74532B 4.1730105.9942 4.1880106.3752 4.2036106.7714 4.2116106.9746 4.2500107.950069441⁄2–10 UNS 2A 0.00210.0533 4.4979114.2467 4.4850113.9190—— 4.4329112.5957 4.4259112.4179 4.3789111.22412B 4.3920111.5568 4.4130112.0902 4.4350112.6490 4.4441112.8801 4.5000114.300069541⁄2–14 UNS 2A 0.00180.0457 4.4982114.2543 4.4879113.9927—— 4.4518113.0757 4.4456112.9182 4.4132112.09532B 4.4230112.3442 4.4380112.7252 4.4536113.1214 4.4616113.3246 4.5000114.300070043⁄4–10 UNS 2A 0.00220.0559 4.7478120.5941 4.7349120.2665—— 4.6828118.9431 4.6756118.7602 4.6288117.57152B 4.6420117.9068 4.6630118.4402 4.6850118.9990 4.6944119.2378 4.7500120.650070143⁄4–14 UNS 2A 0.00190.0483 4.7481120.6017 4.7378120.3401—— 4.7017119.4232 4.6953119.2606 4.6631118.44272B 4.6730118.6942 4.6880119.0752 4.7036119.4714 4.7119119.6823 4.7500120.6500706 5.00–10 UNS 2A 0.00220.0559 4.9978126.9441 4.9849126.6165—— 4.9328125.2931 4.9256125.1102 4.8788123.92152B 4.8920124.2568 4.9130124.7902 4.9350125.3490 4.9444125.5878 5.0000127.00007075.00–14 UNS2A0.00190.04834.9981126.95174.9878126.6901——4.9517125.77324.9453125.61064.9131124.79272B4.9230125.04424.9380125.42524.9536125.82144.9619126.03235.0000127.0000InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmNo.MaxMinor DiameterMinMaxPitch Diameter Major Diameter MinMin eMajor DiameterUNR Minor Dia.,c Max (Ref.)Max dMinMinPitch DiameterNominal Size,Threads perInch,and Series Designation aClassClassMax dMinAllowance71251⁄4–10 UNS 2A 0.00220.0559 5.2478133.2941 5.2349132.9665—— 5.1829131.6457 5.1756131.4602 5.1288130.27152B 5.1420130.6068 5.1630131.1402 5.1850131.6990 5.1944131.9378 5.2500133.350071351⁄4–14 UNS 2A 0.00190.0483 5.2481133.3017 5.2378133.0401—— 5.2017132.1232 5.1953131.9606 5.1631131.14272B 5.1730131.3942 5.1880131.7752 5.2036132.1714 5.2119132.3823 5.2500133.350071851⁄2–10 UNS 2A 0.00220.0559 5.4978139.6441 5.4849139.3165—— 5.4328137.9931 5.4256137.8102 5.3788136.62152B 5.3920136.9568 5.4130137.4902 5.4350138.0490 5.4444138.2878 5.5000139.700071951⁄2–14 UNS 2A 0.00190.0483 5.4981139.6517 5.4878139.3901—— 5.4517138.4732 5.4453138.3106 5.4131137.49272B 5.4230137.7442 5.4380138.1252 5.4536138.5214 5.4619138.7323 5.5000139.700072453⁄4–10 UNS 2A 0.00220.0559 5.7478145.9941 5.7349145.6665—— 5.6828144.3431 5.6754144.1552 5.6288142.97152B 5.6420143.3068 5.6630143.8402 5.6850144.3990 5.6946144.6428 5.7500146.050072553⁄4–14 UNS 2A 0.00200.0508 5.7480145.9992 5.7377145.7376—— 5.7016144.8206 5.6951144.6555 5.6630143.84022B 5.6730144.0942 5.6880144.4752 5.7036144.8714 5.7121145.0873 5.7500146.05007306–10 UNS 2A 0.00220.0559 5.9978152.3441 5.9849152.0165—— 5.9328150.6931 5.9254150.5052 5.8788149.32152B 5.8920149.6568 5.9130150.1902 5.9350150.7490 5.9446150.9928 6.0000152.40007316–14 UNS2A0.00200.05085.9980152.34925.9877152.0876——5.9516151.17065.9451151.00555.9130150.19022B5.9230150.44425.9380150.82525.9536151.22145.9621151.43736.0000152.4000。

...UNF表示美国统一螺纹细牙系列

1/4-28 UNF-3A，其中1/4表示螺纹公称直径（即螺纹公称直径为0.25英寸）；28表示螺距（即每一英寸长度内有28牙）；UNF表示美国统一螺纹细牙系列（即一般用途螺栓、螺钉、螺母和螺纹孔用统一螺纹）；3A的3表示螺纹精度等级（即3级精度螺纹），A表示为外螺纹。

请问是多大规格？还有什么技术要求？能否把图纸传过来。

10-32 UNF-2A的螺纹大径是0.1891-0.1831英寸8-32 UNC-2A的螺纹大径是0.1631-0.1571英寸标准件你可以参照中国标准出版社2003年5月出版的“标准紧固件质量大全”一书。

非标件你可以参照二楼先生的办法。

2”NPT管螺纹的尺寸：螺距：11 1/2（即0.08696英寸），外螺纹起始端的中径：2.26902英寸，螺纹基本三角形高度：0.7531英寸，螺纹牙高：0.6261～0.06957英寸，削平量：0.0029～0.0063英寸，相当的削平宽度：0.0033～0.0073英寸，内螺纹扳动拧紧长度：0.2609英寸（3牙）。

内螺纹扳动拧紧直径：2.25272英寸，尾扣螺纹长度：0.301英寸（3.47牙），外螺纹总长度：1.0582英寸，完整外螺纹公称长度：0.5826英寸，完整外螺纹直径：2.30543英寸，螺纹牙高：0.6957英寸。

1.3/4-16 UNF-2A 的具体数据。

容隙：0.0015；大径：0.7391～0.7485；中径：0.7029～0.7079，小径：0.6718。

2. 3/8-18 NPSM 的具体数据。

容隙：0014；大径：0.653～0.662；中径：0.6211～0.6256，外螺纹的大径削平量为0.10825P计算得到的，内螺纹小径的削平量为0.21651计算得到的。

3. 7/8‘ 六角螺母的具体尺寸。

可以查看航空标准化编辑部出版的“美国联邦螺纹标准手册 H28”。

你可以和上海申光高强度螺栓有限公司联系。

联系电话：021－58252185 58251041 58251129。

螺纹标记(公制、美制和英制)

螺纹标记（公制、美制和英制）1，公制螺纹标记：.11标记方法完整的螺纹标记由螺纹特征代号、尺寸代号、公差代号及其他代号组成。

螺纹特征代号用“M”表示。

单线螺纹的尺寸代号为“公称直径╳螺距”，公称直径和螺距数值的单位为毫米。

对粗牙螺纹，可以省略标注其螺距项。

多线螺纹的尺寸代号为“公称直径╳Ph导程、P螺距“、公称直径、导程.和螺距数值的单位为毫米.可以在后面增加括号说明线数(英文).公差带代号包含中径和顶径公差带代号, 中径公差带代号在前, 顶径公差带代号在后.内螺纹用大写字母,外螺纹用小写字母，.如果中径公差带代号和顶径公差带代号相同,则只标注一个公差带代号，.螺纹尺寸代号与公差带间用”━”号分开.大批生产的紧固件螺纹(中等公差精度和中等旋合长度,6H/6g)不标注其公差带代号。

表示螺纹配合时, 内螺纹公差带代号在前, 外螺纹公差带代号在后,中间用斜线分开.对旋合长度为短组和长组的螺纹,在公差带代号后应分别标注”S”和:”L”代号.旋合长度代号和公差带间用”━”号分开。

中等旋合长度组不标注.旋合长度代号（N）。

左旋螺纹应在旋合长度代号之后标注“LH”代号。

旋合长度代号与旋向代号间用”━”号分开。

右旋螺纹不标注旋向代号。

1.2 标记示例1.2.1普通螺纹特征代号和尺寸代号部分的标注公称直径为8mm、螺距为1mm的单线细牙螺纹：M8×1公称直径为8mm、螺距为1.25mm的单线粗牙螺纹：M8公称直径为16mm、螺距为1.5mm、导程为3mm的双线螺纹：M16×Ph3P1.5或M16×Ph3P1.5（two starts）1.2.2 增加公差带代号后的标注中径公差带为5g、顶径公差带为6g的外螺纹：M10×1-5g6g中径公差带和顶径公差带为6g的粗牙外螺纹：M10-6g中径公差带为5H、顶径公差带为6H的内螺纹：M10×10-5H6H中径公差带和顶径公差带为6H的粗牙内螺纹：M10-6H中径公差带和顶径公差带均为6g、中等公差径精度的粗牙外螺纹：M10中径公差带和顶径公差带均为6g、中等公差径精度的粗牙内螺纹：M10公差带为6H的内螺纹与公差带为5g6g外螺纹组成配合：M20×2-6H/5g6g公差带为6H的内螺纹与公差带为6g的外螺纹组成配合（中等精度、粗牙）：M201.2.3增加旋合长度代号后的标注短旋合长度的内螺纹：M20×2-5H-S长旋合长度的内、外螺纹：M6-7H/7g6g-L中等旋合长度的外螺纹（粗牙、中等精度的6g公差带）：M61.2.4 增加旋向代号后的标注（完整标注）左旋螺纹：M8×1-LH（公差带代号和旋合长度代号被省略）M6×0.75-5h6h-S-LHM14×Ph6P2-L-LH 或M14×Ph6P2（three starts）-L-LH右旋螺纹：M6（螺距、公差带代号和旋向代号被省略）2美制统一螺纹标注2.1美制统一螺纹的基本标记对标准系列、标准旋合长度和标准公差的统一螺纹，其标记包含五项基本内容。

美制标准系列统一螺纹的基本、公差和极限极限尺寸

32 12 16 20 28 32 9
UN UN UN UNEF UN UN UNC
7/8 12 UN
7/8 14 UNF
7/8 16 UN
7/8 20 UNEF
7/8 28 UN
175//81 156/1 156/1 156/1 156/1
61
32 12 16 20 28 32 8
UN UN UN UNEF UN UN UNC
5.4907
5.6793
5.6612
7.6848 7.6997
7.9067 7.9066
6.4099 6.5627
6.7313 6.8548
6.6795 6.8062
7.7264 7.9096
6.7918
7.0388
6.9953
7.7456 7.9109
6.9555
7.1693
7.1295
7.7611 7.9123
16.1012 16.3798
15.9625 16.2647
17.2485 17.4317 16.3168 16.5638 16.4648
17.2683 17.4335 16.4805 16.6943 16.6070
17.2838 17.4350 16.6032 16.7918 16.7131
18.6768 19.0051 18.7171 19.0079
12.5068 12.6720 11.7180 11.9318 11.8593
12.5223 12.6735 13.9569 14.2477
11.8407 11.9961
12.0293 12.4548
11.9636 12.3005
14.0115 14.2515 12.5690 第 1 页，共 8 页

美制统一螺纹表UNC,UNF

7/16 0.4375 7/16 0.4375 7/16 0.4375 7/16 0.4375 7/16 0.4375 1/2 1/2 1/2 1/2 1/2 0.5000 0.5000 0.5000 0.5000 0.5000
9/16 0.5625 9/16 0.5625 9/16 0.5625 9/16 0.5625 9/16 0.5625
中经公差外螺纹大经公差内螺纹小经公差外螺纹大经极限尺寸内螺纹小经极限尺寸2a1a3b1amax1amin3bmax1amax1amin3bmax0060080unf005190046500447152401180311345031750001762000052900032320006943000694300594714005623970053411005341115105741428490135664913566490073064unc006290056100538185421424614246039690001970000059100037500007546000754600724090006865900063632006363218391891743939161624516162450073072unf006400058000560185421472314723035280001899000057000034670006597000659700724303006896350064562006456218397301751673163986516398650086056unc007440066700641218441693416934045360002127000063800040990007645000764500853619008126280074314007431421681922064074188758218875820086064unf007590069100668218441754817548039690002040000061200037500006576000657600853880008163800075661007566121688552073605192179019217900099048unc008550076400734251461941819418052920002302000069100045430008099000809900983094009376660084546008454624970592381672214747021474700099056unf008740079700771251462023620236045360002191000065700040990006827000682700983427009424360086496008649624979052393786

公制、英制、美制螺纹标记

示例 M8X1 M8 M16XPh3P1.5 1/4-20UNC-2A(21)
1 in.-10B.S.W.,LH(close)bolt
2 in.2 start,0.2in.lead,0.1in.pitch,Whit S0.9-4H5-LH（左旋） S0.9-4h5 MJ6X1-4h6h（右旋外螺纹） 3.5000-12 UNJ-2B (21)
螺纹特征代号+尺寸代号+ 公差带代号+其他螺纹尺寸代号+特征代号+ 公差带代号+旋向代号
尺寸代号：公称直径（mm）X导程（mm）（P螺距（mm））尺寸代号：公称直径（英寸）-牙数尺寸代号：公称直径（英寸）-螺距P（英寸）-导程L（英寸）
公称直径+特征代号+牙数+公差带代号
螺纹特征代号+尺寸代号+旋向代号（左旋LH；右旋省略）
螺纹特征代号+尺寸代号+中等公差等级代号（内螺纹省略；外螺纹A/B）+旋向代号螺纹特征代号+尺寸代号+旋向代号螺纹尺寸代号+特征代号+公差等级代号（1省略或2）螺纹尺寸代号+特征代号
螺纹尺寸代号+特征代号螺纹尺寸代号+公称尺寸+基准距离代号(标准不标；短型-S) 螺纹尺寸代号+公称尺寸+基准距离代号+·GB/T1145 牙型+管路系列+基本尺寸+公差值+标记方法
米制航空航天标准螺纹标记（MJ）螺纹（MJ）特殊系列螺纹（MJS）螺纹基本标记左旋螺纹标记美制航空航天控制单项参数公差螺纹标记螺纹（UNJ）修改顶径公差螺纹标记特殊旋合长度螺纹标记特殊系列螺纹标记米制梯形螺纹单线螺纹（30°）多线螺纹（Tr）一般用途爱克母螺纹美制梯形螺纹（29°）对中爱克母螺纹（ACME）传动连接螺纹

美国UNF和unc螺纹标准

美国UNF和unc螺纹标准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。

公英美螺纹标准

外螺纹下料原则：M-0.1P螺纹规格牙距螺纹底孔直径M2 标准0.40 1.60细牙0.25 1.75M2.5 标准0.45 2.10细牙0.35 2.20M2.6 标准0.45 2.20细牙0.35 2.25M3 标准0.50 2.60细牙0.35 2.70M3.5 标准0.60 3.00细牙0.35 3.20M4 标准0.70 3.40细牙0.50 3.60M5 标准0.80 4.20细牙0.50 4.60M6 标准 1.00 5.10细牙0.75 5.30M8 标准 1.25 6.80细牙1 1.00 7.10细牙2 0.75 7.30M10 标准 1.50 8.60细牙1 1.25 8.90细牙2 1.00 9.10细牙3 0.75 9.30M12 标准 1.75 10.40细牙1 1.50 10.60细牙2 1.25 10.90细牙3 1.00 11.10M14 标准 2.00 12.20细牙1 1.50 12.60细牙2 1.00 13.10M16 标准 2.00 14.20细牙1 1.50 14.60细牙2 1.00 15.10M18 标准 2.50 15.70细牙1 2.00 16.20细牙2 1.50 16.60细牙3 1.00 17.10切削速度與切削液◎最適○適用△可使用－不可使用螺紋下孔徑表註(1)M1.4以下等級：5H、M1.6以上等級：6H(2)基於JIS B 0209-1982標準螺紋下孔徑表螺紋下孔徑表(2)基於JIS B 0211-1982標準螺紋下孔徑表螺紋下孔徑表螺紋下孔徑表螺紋下孔徑表螺紋下孔徑表10259.166259262.15426212309.747310312.875313G是中国、法国、前苏联、日本的代号；PF是日本的代号；BSP、BSPP是英国的代号；R、K是德国的代号(R是内螺纹、K是外螺纹)；TPYБ是前苏联的代号；Rp是ISO的代号。

BSPP-英制圆柱管螺纹代号，只有内螺纹，相当于国内的55度圆柱(平行)管螺纹,即G BSPT-英制圆锥管螺纹标准：指螺纹的牙型角为55°、螺纹具有1：16的锥度G-英制非密封管螺纹R-英制一般密封管螺纹Rc-英制密封圆锥内螺纹NPT-美制一般密封管螺纹NPTF-美制干密封管螺纹NPSM-美制非密封管螺纹Mc、Mp-公制一般密封管螺纹M-公制非密封管螺纹美制螺纹1. 美制普通螺纹1) UNC-粗牙系列3/8—16 UNC—2A2) UNF-细牙系列3/8—24 UNF—2A3) UNEF-特细牙系列3/8—32 UNEF（UNFF）—2A4) UN-定螺距系列3/8—20 UN—2A5) UNS-非常规系列UNS很少用到的螺距，0.650－19UNS 安全装置螺纹6) UNR-圆弧牙底恒定螺距系列的统一螺纹（只有外螺纹）7) UNRC-圆弧牙底粗牙系列统一螺纹（只有外螺纹）8) UNRF-圆弧牙底细牙系列统一螺纹（只有外螺纹）9) UNREF-圆弧牙底超细牙系列统一螺纹（只有外螺纹）10) UNRS-圆弧牙底特殊系列统一螺纹（只有外螺纹）11) NBUTT-锯齿螺纹12) ACME-一般用途的梯形螺纹，美国标准ANSIB1.5 牙型角为29°的英制传动螺纹；一般用途的（G）和定心的（C）两种配合的梯形螺纹，其中一般用途者与我国标GB/T5796-1986规定的梯形螺纹的性能相类同。

美制统一螺纹UN的标准系列及基本尺寸

美制一致螺纹(UN)
1864年,美国人威利.赛特斯（WillianSellers）参照英国惠氏螺纹标准系统拟订了美国国家螺纹（N）.这两种螺纹在直径与螺距系列和公差方面很邻近，但美国国家螺纹的牙型（牙型
角为60，削平高度为H/8）不一样于惠氏螺纹牙型（牙型角为55，削平高度为H/6）在美国工业影响的地域和行业，美国家螺纹获得宽泛应用.
第二次世界大战中，因为盟军所使用的螺纹标准不一致，后勤补给困难给盟军造成了严重的经济损失和人员伤亡.二战刚结束，美国英国和加拿大等盟国立刻着手拟订盟国间一致的螺纹标准，于1948年公布了一致螺纹标准.因为当时美国的经济实力和军事实力在盟军内占
主导地位，所以一致螺纹主假如依照美国国家螺纹标准而拟订的，一致螺纹代号“UN”的前一个字母“U”根源于盟国间的“一致”；后一个字母“N”根源于美国国家螺纹的代号“N”从.此，一致螺纹开始挤占英国惠氏螺纹原有的使用市场.
表1-21一致螺纹的标准系列
一致粗牙螺纹（UNC或UNRC）的基本尺寸
公称直基本大牙数基本中UNR外螺纹设计牙内螺纹基本小径
径径
n 径型小径（参照）D2
D2
D D2
1/428 5/1624
3/824
7/1620
1/220
9/1618
5/818
3/416
7/814
一致细牙螺纹（UNC或UNRC）的基本尺寸
公称直基本大牙数基本中UNR外螺纹设计牙内螺纹基本小径
径径
n 径型小径（参照）D2
D2
D D2 1/428
5/1624
3/824
7/1620
1/220
9/1618
5/818
3/416
7/814。

美制统一螺纹(UN)的标准系列及基本尺寸

美制统一螺纹(UN)
1864年,美国人威利.赛特斯（Willian Sellers）参照英国惠氏螺纹标准体系制定了美国国家螺纹（N）.这两种螺纹在直径与螺距系列和公差方面很相近，但美国国家螺纹的牙型（牙型角为60，削平高度为H/8）不同于惠氏螺纹牙型（牙型角为55，削平高度为H/6）在美国工业影响的地区和行业，美国家螺纹得到广泛应用.
第二次世界大战中，由于盟军所使用的螺纹标准不统一，后勤补给困难给盟军造成了严重的经济损失和人员伤亡.二战刚结束，美国英国和加拿大等盟国马上着手制定盟国间统一的螺纹标准，于1948年颁布了统一螺纹标准.由于当时美国的经济实力和军事实力在盟军内占主导地位，因此统一螺纹主要是依据美国国家螺纹标准而制定的，统一螺纹代号“UN”的前一个字母“U”来源于盟国间的“统一”；后一个字母“N”来源于美国国家螺纹的代号“N”.从此，统一螺纹开始挤占英国惠氏螺纹原有的使用市场.
表1-21统一螺纹的标准系列
公称直径基本大
径
D
牙数
n
基本中
径
D2
UNR外螺纹设计牙型
小径（参考）D2
内螺纹基本小径
D2
1/4 0.2500 28 0.2268 0.2074 0.2113
统一细牙螺纹（UNC或UNRC）的基本尺寸。

uns螺纹标准

uns螺纹标准UNS螺纹标准。

UNS螺纹标准是指美国国家标准协会（ANSI）制定的螺纹标准，它是一种常见的螺纹连接标准，被广泛应用于机械设备、管道连接、汽车制造等领域。

UNS螺纹标准的实施对于提高产品的质量、安全性和可靠性起着重要的作用。

本文将对UNS螺纹标准进行介绍，以便广大读者更好地了解和应用这一标准。

UNS螺纹标准包括了螺纹的尺寸、螺距、公差、形状和加工工艺等方面的规定。

其中，UNS螺纹标准主要分为内螺纹和外螺纹两种类型，分别适用于不同的连接方式。

内螺纹通常用于螺栓、螺母等零件的连接，而外螺纹则用于管道、阀门等设备的连接。

根据不同的工作条件和要求，UNS螺纹标准还包括了多种不同的螺纹类型，如UNC、UNF、UNEF等，以满足不同连接的需求。

UNS螺纹标准的制定经过了严格的技术评审和实验验证，保证了其在工程实践中的可靠性和适用性。

采用UNS螺纹标准的产品在连接时具有较高的密封性和承载能力，能够有效地防止漏气、漏油和松动现象的发生，从而保障了设备的正常运行和安全使用。

此外，UNS螺纹标准还规定了螺纹的加工工艺和质量检验要求，确保了螺纹的加工精度和质量稳定性，提高了产品的可靠性和使用寿命。

在实际应用中，遵循UNS螺纹标准可以有效地降低产品的设计和制造成本，提高产品的互换性和通用性。

由于UNS螺纹标准具有统一的尺寸和公差规定，不同厂家生产的零部件可以互相替换使用，减少了库存成本和备件的数量，提高了物料利用率和生产效率。

此外，UNS螺纹标准还为产品的设计和制造提供了参考依据，简化了工程设计和加工工艺，缩短了产品的开发周期，提高了市场竞争力。

总的来说，UNS螺纹标准是一种重要的螺纹连接标准，它对于提高产品的质量、安全性和可靠性具有重要的意义。

遵循UNS螺纹标准可以有效地降低产品的设计和制造成本，提高产品的互换性和通用性，推动了工程技术的进步和产品质量的提高。

因此，我们应该加强对UNS螺纹标准的学习和应用，不断提高自身的技术水平和专业能力，为推动行业的发展和进步做出更大的贡献。

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公制 美制螺纹标准数据库 UNS