公差值IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT18µmmm于到-334636101522361058181100.180.270.430.701.101.82.76918841300.210.330.520.841.302.13.33073011162539621001600.250.390.621.001.602.53.9505088080120180250315400线性尺寸：例如外尺寸、内尺寸、阶梯尺寸、直径、半径、距离、倒圆半径和倒角高度；这些极限偏差不适用于：表1线性尺寸的极限偏差数值尺寸分段>30>120>400120400±±-±±±0.3±±±0.8级)0.20.30.5-±1±1.5±4±6表2倒圆半径与倒角高度尺寸的极限偏差数值尺寸分段公差等级0.53>36>630>30±0.2±0.5±2±1±4公差等级>1050>50120>120400>400±30'±10'f(精密级)m(中等级)±1°±5'c(粗糙级)±1°v(最粗级)±2°±3°位置公差定位公差是关联实际要素对基准在位置上允许的变动全量。这类公差包括同轴度、对称度、位置度3项。符号简要描述符号简要描述直线度是表示零件平行度是表示零上的直线要素实际形状保持理想直线的状况。也就是通常所说的平直程度。直线度公差是实际件上被测实际要素相对于基准保持等距离的状况。也就是通常所说的保持平行的程度。直线�

3+40+6000000+0+0+0+0+0+12+18+30+48+7536+50+8000000+0+0+0+0+0+0+0+15+22+36+58+90610+60+9000000+0+0+0+0+0+0+0+11+18+27+43+70+1101018+80000000+0+0+0+0+080+0+13+21+33+52+84+1301830+90000000+0+0+0+0+0+0+0+16+25+39+62+100+1603050+110000000+0+0+0+10+0+0+0+19+30+46+74+120+1905080+130000000+0+0+0+0+0+30+0+22+35+54+87+140+22080120+150000000+0+0+0+0+0+0+0+25+40+63+100+160+250120180+180000000+0+0+10+0+0+40+0+29+46+72+115+182+290180250+200000000+0+0+0+0+0+0+0+32+52+81+130+210+320250315+230000000+0+0+0+0+0+0+0+36+57+89+140+230+360315400+250000000+0+0+0+0+0+0+0+40+63+97+155+250+400400500+270000000+0+0+0+0+40+0+0+44+70+110+175+280+440+11500630+320000000+0+0+0+0+0+700+50+80+125+200+320+500630800+360000000+0+0+20+0+50+80+0+56+90+140+230+360+560+148001 000+400000000+0+0+0+0+0+900+66+105+165+260+420+6601 0001 250+470000000+0+0+0+0+0+0+0+78+125+195+310+500+7801 2501 600+550000000+0+0+0+50+0+0+0+92+150+230+370+600+920+15+231 6002 000+650000000+0+0+0+60+000+110+175+280+440+700+1 100+11+282 0002 500+780000000+0+0+0+700+00+135+210+330+540+860+1 350+21332 5003 150+960000000+0+0+0+0+000注：1．IT14至IT18只用于大于1mm的基本尺寸。 黑框中的数值，即基本尺寸大于5003 150mm，IT1至IT5的

基本尺寸公差等IT01级It0It1It2It 3It4It5It6It7It8It9It10It11It12It13It14It15(um)1t163It170.3It180.50.81.22346(mm)1014>3~625400.4600.61001141.5.252.5404.6051.08>6~10121.4180.4300.6481751.51202.5.184.30694815.75>10~18221.2361.80.5580.8901.215023.223655889011>18~301.518272.20.6437011101.5x2.5180.276.439.70131.1211.8>30~50332.7520.61841.5130A2.5\21033.5211.84161.3>50~80252.1393.3620.81001.2216025035.39862131.01.6192.530>80~120463.97411201.52.519043006.4610.74151.2221.9>120~180353.0541.2874.621403.5522083505412.8718251.42.240>180~2503.5631005.4216034.525040076310141.0201.62.529>250~315464.0726.32.511541852906846012.721.1516231.85322.9>315~40052814.6513057.221073209520.81131.3182.1253.236>400~5005.257898.1414023068360105701589201.4272.3403.6635.7971558.9250400630.971.52.54.06.39.75

基本尺寸基本尺寸mm标准公差等级IT1IT21T3IT4IT51T6177IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17大于至IT18ummm30.81.2_234610142540600.10.140.250.40.6131.4611.52.545812183048750.120.180.30.480.751.261.81011.52.546915223658900.150.220.360.580.91.510182.21.2235811182743701100.180.270.430.71.11.818302.71.52.546913213352841300.210.330.520.841.32.1303.3501.52.54711162539621001600.250.390.6211.62.550803.9235813193046741201900.30.460.741.21.93801204.62.5410615223554871402200.350.540.871.42.23.51205.41803.55812182540100631602500.40.6311.62.541806.32504.571410202946721151852900.460.721.151.852.94.62507.2315681216233252811302103200.520.811.32.13.25.23158.1400791318253657891402303600.570.891.42.33.65.74008.95001081520274063971552504000.630.971.552.546.39.750063011916223244701101752804400.71.11.752.84.4763080011101318253650801252003205000.81.2523.25880012.51000111521284056901402303605600.91.42.33.65.6914100012501318243347661051652604206601.051.652.64.26.510.5125016.516001521293955781251953105007801.251.953.157.8150012.5200019.51825354665921502303706009201.52.33.769.2152000232500223041557811017528044070011001.752.84.471117.52500315028263650689613521033054086013502.13.35.48.6注:1.基本

公差与配合〔摘自GB1800180479〕1．根本偏差系列及配合种类.2．标准公差值及孔和轴的极限偏差值标准公差值(根本尺寸大于6至500mm)公差等级根本尺寸mmIT5IT6IT7IT8IT9IT10IT11IT12>610691522365890150>101881118274370110180>183091321335284130210>30501116253962100160250>50801319304674120190300>801201522355487140220350>12018018254063100160250400>18025020294672115185290460>25031523325281130210320520>31540025365789140230360570>40050027406397155250400630孔的极限差值〔根本尺寸由大于10至315mm〕μm根本尺寸mm公差带等级>018>1830>3050>5080>80120>120180>180250>2503158+77+50+98+65+119+80+146+100+174+120+208+145+242+170+271+1909+93+50+117+65+142+80+174+100+207+120+245+145+285+170+320+190D10+120+50+149+65+180+80+220+100+260+120+305+145+355+170+400+19011+160+50+195+65+240+80+290+100+340+120+395+145+460+170+510+1906+43+32+53+40+66+50+79+60+94+72+110+85+129+100+142+1107+50+32+61+40+75+50+90+60+107+72+125+85+146+100+162+110E8+59+32+73+40+89+50+106+60+126+72+148+85+172+100+191+1109+75+32+92+40+112+50+134+60+159+72+185+85+215+100+240+11010+102+32+124+40+150+50+180+60+212+72+245+85+285+100+320+1106+27+16+33+20+41+25+49+30+58+36+68+43+79+5

常用标准公差数值μm/mm大于，至IT5IT6塑料件3、4、IT7IT8IT95级公差值IT10IT11IT12IT13IT14~34大于，至6103级14254级405级600.100.140.253~65812~3180.0830480.12750.160.120.180.306~1063~6915220.0836580.140.18900.150.220.3610~1886~101118270.100.1643700.201100.180.270.4318~30910~1413210.12330.18520.22841300.210.330.5230~5014~181116250.12390.20621000.241600.250.390.6250~801318~2419300.14460.22741200.281900.300.460.7480~1201524~3022350.16540.24871400.322200.350.540.87120~1801830~4025400.18631000.261602500.360.400.631.00180~2502040~502946720.201150.281850.402900.460.721.15250~3152350~6532520.22811300.322100.463200.520.811.30315~4002565~803657890.261400.382300.523600.570.891.40400~5002780~10040630.30971550.442500.600.634000.971.55500~630100~12030440.34701100.501752800.684400.701.101.75630~80035120~140500.38801250.562003200.765000.801.252.00800~100040140~160560.4290|1400.622300.843605600.901.402.30160~1800.460.680.92GB/T1184-1996直线、平面度未注公差180~2000.500.741.00公差等级200~225基本长度范围0.560.821.10~1010~3030~100225~250100~300]300~10000.620.901000~30001.20H0.020.050.1250~2800.20.680.31.001.300.4K0.050.10.20.40.60.80.10.20.40.81.21.6GB/T1804-92