InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmm 3310–28 UNS2A0.00100.02540.18904.80060.18254.6355——0.16584.21130.16254.12750.14643.71862B0.15103.83540.16004.06400.16684.23670.17114.34590.19004.8260 3610–36 UNS2A0.00090.02290.18914.80310.18364.6634——0.17114.34590.16814.26970.15603.96242B0.16004.06400.16604.21640.17204.36880.17594.46790.19004.8260 3710–40 UNS2A0.00090.02290.18914.80310.18404.6736——0.17294.39170.17004.31800.15924.04372B0.16304.14020.16904.29260.17384.41450.17754.50850.19004.8260 3810–48 UNS2A0.00080.02030.18924.80570.18474.6914——0.17574.46280.17314.39670.16444.17582B0.16704.24180.17204.36880.17654.48310.17994.56950.19004.8260 3910–56 UNS2A0.00070.01780.18934.80820.18524.7041——0.17774.51360.17524.45010.16814.26972B0.17104.34340.17504.44500.17844.53140.18164.61260.19004.8260 No. Standard Series and Selected Combinations- Unified Screw Threads Max Minor Diameter MinMax Pitch Diameter Major Diameter Min Mine Major Diameter UNR Minor Dia.,c Max (Ref.) Maxd Min Min Pitch Diameter Nominal Size, Threads per Inch, and Series Designationa Class Class Maxd Min Allowance InternalbExternalb InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmm No. Standard Series and Selected Combinations- Unified Screw Threads Max Minor Diameter MinMax Pitch Diameter Major Diameter Min Mine Major Diameter UNR Minor Dia.,c Max (Ref.) Maxd Min Min Pitch Diameter Nominal Size, Threads per Inch, and Series Designationa Class Class Maxd Min Allowance InternalbExternalb 4612–36 UNS2A0.00090.02290.21515.46350.20965.3238——0.19715.00630.19414.93010.18214.62532B0.18604.72440.19204.87680.19805.02920.20195.12830.21605.4864 4712–40 UNS2A0.00090.02290.21515.46350.21005.3340——0.19895.05210.19604.97840.18354.66092B0.18904.80060.19504.95300.19985.07490.20355.16890.21605.4864 4812–48 UNS2A0.00080.02030.21525.46610.21075.3518——0.20175.12320.19915.05710.19044.83622B0.19304.90220.19805.02920.20255.14350.20595.22990.21605.4864 4912–56 UNS2A0.00070.01780.21535.46860.21125.3645——0.20375.17400.20125.11050.19414.93012B0.19705.00380.20105.10540.20445.19180.20765.27300.21605.4864 531⁄4–24 UNS2A0.00110.02790.24896.32210.24176.1392——0.22185.63370.21815.53970.19935.06222B0.20505.20700.21505.46100.22295.66170.22775.78360.25006.3500 541⁄4–27 UNS2A0.00100.02540.24906.32460.24236.1544——0.22495.71250.22145.62360.20495.20452B0.21005.33400.21905.56260.22595.73790.23045.85220.25006.3500 601⁄4–36 UNS2A0.00090.02290.24916.32710.24366.1874——0.23115.86990.22805.79120.21615.48892B0.22005.58800.22605.74040.23205.89280.23605.99440.25006.3500 611⁄4–40 UNS2A0.00090.02290.24916.32710.24406.1976——0.23295.91570.23005.84200.21935.57022B0.22305.66420.22905.81660.23385.93850.23766.03500.25006.3500 621⁄4–48 UNS2A0.00080.02030.24926.32970.24476.2154——0.23575.98680.23305.91820.22435.69722B0.22705.76580.23205.89280.23656.00710.24016.09850.25006.3500 631⁄4–56 UNS2A0.00080.02030.24926.32970.24516.2255——0.23766.03500.23505.96900.22805.79122B0.23105.86740.23505.96900.23846.05540.24176.13920.25006.3500 725⁄16–27 UNS2A0.00100.02540.31157.91210.30487.7419——0.28747.30000.28397.21110.26746.79202B0.27206.90880.28107.13740.28847.32540.29297.43970.31257.9375 775⁄16–36 UNS2A0.00090.02290.31167.91460.30617.7749——0.29367.45740.29057.37870.27857.07392B0.28207.16280.28907.34060.29457.48030.29857.58190.31257.9375 785⁄16–40 UNS2A0.00090.02290.31167.91460.30657.7851——0.29547.50320.29257.42950.28187.15772B0.28507.23900.29107.39140.29637.52600.30017.62250.31257.9375 795⁄16–48 UNS2A0.00080.02030.31177.91720.30727.8029——0.29827.57430.29557.50570.28697.28732B0.29007.36600.29507.49300.29907.59460.30267.68600.31257.9375 833⁄8–18 UNS2A0.00130.03300.37379.49200.36509.2710——0.33768.57500.33338.46580.30767.81302B0.31508.00100.32808.33120.33898.60810.34458.75030.37509.5250 InchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmmInchmm No. Standard Series and Selected Combinations- Unified Screw Threads Max Minor Diameter MinMax Pitch Diameter Major Diameter Min Mine Major Diameter UNR Minor Dia.,c Max (Ref.) Maxd Min Min Pitch Diameter Nominal Size, Threads per Inch, and Series Designationa Class Class Maxd Min Allowance InternalbExternalb 893⁄8–27 UNS2A0.00110.02790.37399.49710.36729.3269——0.34988.88490.34628.79350.32988.37692B0.33508.50900.34408.73760.35098.91290.35569.03220.37509.5250 943⁄8–36 UNS2A0.00100.02540.37409.49960.36859.3599——0.35609.04240.35288.96110.34098.65892B0.34508.76300.35208.94080.35709.06780.36129.17450.37509.5250 953⁄8–40 UNS2A0.00090.02290.37419.50210.36909.3726——0.35799.09070.35489.01190.34438.74522B0.34808.83920.35408.99160.35889.11350.36289.21510.37509.5250 960.390–27 UNS2A0.00110.02790.38899.87810.38229.7079——0.36489.26590.36129.17450.34488.75792B0.35008.89000.35909.11860.36599.29390.37069.41320.39009.9060 1027⁄16–18 UNS2A0.00130.03300.436211.07950.427510.8585——0.400110.16250.395810.05330.37019.40052B0.37709.57580.39009.90600.401410.19560.407010.33780.437511.1125 1067⁄16–24 UNS2A0.00110.02790.436411.08460.429210.9017——0.409310.39。