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1、未注公差尺寸的極限偏差（GB/T1800.1-1997）公稱尺寸公差等級(jí)公稱尺寸公差等級(jí)IT10IT11IT12IT13IT14IT10IT11IT12IT13IT14大于至單位：mm大于至單位：mm－30.040.060.10.140.253154000.230.360.570.893.60360.0480.0750.120.180.304005000.250.40.630.974.006100.0580.090.150.220.365006300.280.440.71.14.410180.070.110.180.270.43630800
2、0.320.50.81.255.018300.0840.130.210.330.5280010000.360.560.91.45.630500.10.160.250.390.62100012500.420.661.051.656.650800.120.190.30.460.74125016000.50.781.251.957.8801200.140.220.350.540.87160020000.60.921.52.39.21201800.160.250.40.631.00200025000.71.11.752.811.01802500.1
3、850.290.460.721.15250031500.861.352.13.313.52503150.210.320.520.811.30－－－－－公稱尺寸公差等級(jí)公稱尺寸公差等級(jí)IT10／2IT11／2IT12／2IT13／2IT14／2IT10／2IT11／2IT12／2IT13／2IT14／2大于至單位：mm大于至單位：mm－30.020.030.050.070.1253154000.1150.180.2850.4451.8360.0240.0370.060.090.154005000.1250.20.3150.4852.06100
4、.0290.0450.0750.110.185006300.140.220.350.552.210180.0350.0550.090.1350.2156308000.160.250.40.6252.518300.0420.0650.1050.1650.2680010000.180.280.450.72.830500.050.080.1250.1950.31100012500.210.330.5250.8253.350800.060.0950.150.230.37125016000.250.390.6250.9753.9801200.070.
5、110.1750.270.435160020000.300.460.751.154.61201800.080.1250.20.3150.5200025000.350.550.8751.45.51802500.0920.1450.230.360.575250031500.430.6751.051.656.752503150.1050.160.260.4050.65－－－－－未注公差尺寸的極限中差值(或基本偏差JSjs的±值)未注公差尺寸的（h）-中差值及基本偏差JSjs的±值（GB/T1800.1-1997）公稱尺寸公差等級(jí)IT10IT1
6、0／2IT11IT11／2IT12IT12／2IT13IT13／2IT14IT14／2大于至單位：mm－30.980.020.970.030.950.050.930.070.8750.125360.9760.0240.9630.0370.940.060.910.090.850.156100.9710.0290.9550.0450.9250.0750.890.110.820.1810180.9650.0350.9450.0550.910.090.8650.1350.7850.21518300.9580.0420.9350.0650.8950.
7、1050.8350.1650.740.2630500.950.050.920.080.8750.1250.8050.1950.690.3150800.940.060.9050.0950.850.150.770.230.630.37801200.930.070.890.110.8250.1750.730.270.5650.4351201800.920.080.8750.1250.80.20.6850.3150.50.51802500.9080.0920.8550.1450.770.230.640.360.4250.5752503150.895
8、0.1050.840.160.740.260.5950.4050.350.653154000.8850.1150.820.180.7150.2850.5550.445-1.840
