GB1804公差标准

钢、黄铜

铸铁、铝、青铜M14*0.250.7290.809M5*0.5M1.4*0.3 1.075 1.165M6*0.75M2*0.4 1.567 1.677M6*0.5M2.5*0.45 2.013 2.133M8*1M3*0.5 2.459 2.599M8*0.75M4*0.7 3.242 3.422M10*1M5*0.8 4.134 4.334 4.2 4.1M10*0.75M6*1 4.918 5.1185 4.9M12*1M8*1.25 6.647 6.867 6.7 6.6M12*1.5M10*1.58.3768.6268.58.4M14*1M12*1.7510.10610.38610.210.1M14*1.5M14*211.83512.13511.911.8M16*1.5M16*213.83514.13513.913.8M16*1M20*2.517.29417.63417.417.2M20*1.5M22*2.519.29419.63419.4*

19.2M20*1M24*3

20.752

21.132

20.9

20.7M22*1M30*3.526.21126.63126.3*26.1

M24*1.5M30*1.5M30*1

计算公式: dz=d-t

dz=d-(1.04~1.06)t

*可用相近尺寸

粗牙普通螺纹

注：未注公差尺寸的公差等级规定为IT14级，一般孔用H ，轴用h,长度用±

螺纹攻丝前钻孔用钻头直径

0.751.11.62.052.53.3公称直径*螺距

（d*t)最小内径最大内径

钻头直径公称直径*螺距

（d*t)

钢、黄铜

铸铁、铝、青铜4.459 4.599 4.5 4.55.188 5.378 5.2 5.15.459 5.599 5.5 5.46.1987.1187 6.97.1887.3787.27.18.9189.11898.99.1889.3789.29.110.91811.1181110.910.37610.62610.510.412.91813.1181312.9

12.37612.62612.512.4*14.37614.62614.514.414.91815.1181514.918.37618.26218.418.318.91819.11818.918.820.91821.11821

20.922.37622.62622.5*22.328.37628.62628.5*28.328.918

29.118

29

28.8近尺寸的钻头代用

最大内径

钻头直径

般孔用H ，轴用h,长度用±1/2IT

径

细牙普通螺纹

最小内径