标准公制内外螺纹尺寸大全（GB-T196、GB-T9145 完整版）

标准公制内外螺纹尺寸大全（GB/T196、GB/T9145完整版）执行标准：GB/T196-2003《普通螺纹基本尺寸》、GB/T9145-2003《普通螺纹中等精度公差》螺纹牙型：60°公制普通螺纹M精度等级：常规加工默认外螺纹6g、内螺纹6H（通用装配标准）公式速记牙高h=0.5413×P；外螺纹小径=d-1.0825P；内螺纹小径D1=D-1.0825P；中径=D-0.6495P一、公制粗牙螺纹（最常用、无标注螺距默认粗牙）说明：粗牙螺纹不标注螺距，如M6、M8、M10，为通用紧固螺纹螺纹规格螺距P大径基本尺寸中径基本尺寸小径基本尺寸内螺纹底孔推荐孔径M1.00.251.00.8380.7290.75M1.20.251.21.0380.9290.95M1.40.301.41.2051.0751.10M1.60.351.61.3731.2211.25M2.00.402.01.7401.5671.60M2.50.452.52.2082.0132.05M30.503.02.6752.4592.50M3.50.603.53.1102.8502.90M40.704.03.5453.2423.30M50.805.04.4804.1344.20M61.006.05.3504.9185.00M81.258.07.1886.6476.80M101.5010.09.0268.3768.50M121.7512.010.86310.10610.20M142.0014.012.70111.83512.00M162.0016.014.70113.83514.00M182.5018.016.37615.29415.50M202.5020.018.37617.29417.50M222.5022.020.37619.29419.50M243.0024.022.05120.75221.00M273.0027.025.05123.75224.00M303.5030.027.72726.21126.50二、公制细牙螺纹（精密锁紧、密封、薄壁件专用，必须标注螺距）螺纹规格螺距P大径中径小径内螺纹底孔M6×0.750.756.05.5135.1885.20M8×0.750.758.07.5137.1887.20M8×1.01.008.07.3506.9187.00M10×1.01.0010.09.3508.9189.00M10×1.251.2510.09.1888.6478.80M12×1.01.0012.011.35010.91811.00M12×1.251.2512.011.18810.64710.80M14×1.51.5014.013.02612.37612.50M16×1.51.5016.015.02614.37614.50M18×1.51.5018.017.02616.37616.50M20×1.51.5020.019.02618.37618.50M22×1.51.5022.021.02620.37620.50M24×2.02.0024.022.70121.83522.00M27×2.02.0027.025.70124.83525.00M30×2.02.0030.028.70127.83528.00三、常用内外螺纹公差极限尺寸（加工质检核心）默认装配公差：内螺纹6H、外螺纹6g（通用标准、图纸无标注即为此标准）1、内螺纹6H公差（孔螺纹）特点：大径只做基准、中径小径正公差，越攻越大，方便装配2、外螺纹6g公差（轴螺纹）特点：大径、中径负公差，车牙偏小，避免卡死四、加工实操关键说明1.粗牙无需写螺距：图纸M6、M8、M10默认标准粗牙；细牙必须标注螺距如M10×1.02.底孔取值原则：钢、铁按表中标准底孔；铝、铜等软材质可偏小0.05~0.1mm，防止滑牙3.配合关系：6H/6g为最通用间隙配合，适用于95%机械装配；精密配合可选5H/5g，过盈配合需特殊定制4.螺纹判定：公制M螺纹60°牙型，区别于英制55°管螺纹、美制UN螺纹五、快速计算公式（可直接编程/验算）1.螺纹牙高：h