内外标准螺纹尺寸大全（公制+英制+管螺纹 完整版）

内外标准螺纹尺寸大全（公制+英制+管螺纹完整版）适用标准：GB/T196、GB/T197、ISO标准、英制BS、美制UNC/UNF、国标管螺纹G/Rc说明：所有尺寸为标准公称尺寸+极限参考尺寸；外螺纹控制大径/中径，内螺纹控制小径/中径；底孔为常规加工推荐孔径。一、公制粗牙螺纹大全（M普通粗牙最常用）公制粗牙：默认不标注螺距，60°牙型，机械通用主力螺纹螺纹规格螺距P外螺纹大径外螺纹中径外螺纹小径内螺纹小径（底孔标准）内螺纹中径M1.60.351.601.3731.1471.251.458M20.402.001.7401.4801.551.812M2.50.452.502.2081.9162.052.268M30.503.002.6752.3502.502.725M40.704.003.5453.0933.303.647M50.805.004.4803.9274.204.590M61.006.005.3504.7015.005.500M81.258.007.1886.3766.807.348M101.5010.009.0268.0518.509.188M121.7512.0010.8639.72610.2011.023M142.0014.0012.70111.40212.0012.863M162.0016.0014.70113.40214.0014.863M182.5018.0016.37614.75215.5016.630M202.5020.0018.37616.75217.5018.630M222.5022.0020.37618.75219.5020.630M243.0024.0022.05120.10321.0022.316M273.0027.0025.05123.10324.0025.316M303.5030.0027.72725.45426.5028.007二、公制细牙螺纹大全（常用规格）细牙螺纹：标注螺距，精度高、防松、密封好用螺纹规格螺距P外螺纹大径外螺纹中径内螺纹底孔M6×0.750.756.005.5135.20M8×1.01.008.007.3507.00M10×1.01.0010.009.3509.00M10×1.251.2510.009.1888.80M12×1.251.2512.0011.18810.80M12×1.51.5012.0011.02610.50M14×1.51.5014.0013.02612.50M16×1.51.5016.0015.02614.50M18×1.51.5018.0017.02616.50M20×1.51.5020.0019.02618.50M22×1.51.5022.0021.02620.50M24×2.02.0024.0022.70122.00三、英制粗牙/细牙螺纹（UNC/UNF美标常用）牙型角60°，广泛用于设备、模具、进口配件规格牙数/英寸螺距(mm)大径(mm)小径(mm)内螺纹底孔(mm)1/4-20UNC201.2706.3504.9765.101/4-28UNF280.9076.3505.3645.405/16-18UNC181.4117.9386.3486.505/16-24UNF241.0587.9386.8106.903/8-16UNC161.5889.5257.8658.003/8-24UNF241.0589.5258.3908.401/2-13UNC131.95412.70010.26210.501/2-20UNF201.27012.70011.32811.40四、国标圆柱管螺纹G系列（55°非密封管螺纹）水管、气管、液压管路通用，内外螺纹通用匹配螺纹规格每英寸牙数螺距(mm)大径(mm)中径(mm)小径(mm)底孔推荐(mm)G1/8280.9079.7289.1478.5668.6G1/4191.33713.15712.30111.44511.5G3/8191.33716.66215.80614.95015.0G1/2141.81420.95519.79318.63118.7G3/4141.81426.44125.27924.11724.2G1112.30933.24931.77030.29130.3五、圆锥管螺纹Rc/R密封管螺纹（55°密封）高压水气、液压密封专用，锥度1:16，靠螺纹挤压密封规格牙数螺距基准大径基准小径加工底孔Rc1/8280.9079.7288.5668.4Rc1/4191.33713.15711.44511.2Rc3/8191.33716.66214.95014.7Rc1/2141.81420.95518.63118.3六、螺纹加工核心区分（内外螺纹关键要点）1.外螺纹（螺栓、牙轴）控制尺寸：主要保证大径、中径，小径不做严格管控，车削/滚丝以中径合格为核心。2.内螺纹（螺母、螺孔）控制尺寸：主要保证小径、中径，大径无要求，攻牙只需要底孔达标、牙型饱满。3.粗牙/细牙选用原则：普通装配用粗牙；防松