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。