孔的基本偏差数值（GB/T 1800.3-1998）
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基本尺寸
m m
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基本偏差数值
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|
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下偏差EI
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上偏差ES
|
|
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所有标准公差等级
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IT6
|
IT7
|
IT8
|
≤IT8
|
>IT8
|
≤IT8
|
>IT8
|
≤IT8
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>IT8
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≤IT7
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|
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大于
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至
|
|
|
A
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B
|
C
|
CD
|
D
|
E
|
EF
|
F
|
FG
|
G
|
H
|
JS
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J
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K
|
M
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N
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P至ZC
|
|
|
—
|
3
|
+270
|
+140
|
+60
|
+34
|
+20
|
+14
|
+10
|
+6
|
+4
|
+2
|
0
|
由公式计算
|
+2
|
+4
|
+6
|
0
|
0
|
-2
|
-2
|
-4
|
-4
|
在大于IT7的相应数值上增加一个△值
|
|
|
3
|
6
|
+270
|
+140
|
+70
|
+46
|
+30
|
+20
|
+14
|
+10
|
+6
|
+4
|
0
|
+5
|
+6
|
+10
|
-1+△
|
|
-4+△
|
-4
|
-8+△
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0
|
|
|
6
|
10
|
+280
|
+150
|
+80
|
+56
|
+40
|
+25
|
+18
|
+13
|
+8
|
+5
|
0
|
+5
|
+8
|
+12
|
-1+△
|
|
-6+△
|
-6
|
-10+△
|
0
|
|
|
10
|
14
|
+290
|
+150
|
+95
|
|
+50
|
+32
|
|
+16
|
|
+6
|
0
|
+6
|
+10
|
+15
|
-1+△
|
|
-7+△
|
-7
|
-12+△
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0
|
|
|
14
|
18
|
|
|
18
|
24
|
+300
|
+160
|
+110
|
|
+65
|
+40
|
|
+20
|
|
+7
|
0
|
+8
|
+12
|
+20
|
-2+△
|
|
-8+△
|
-8
|
-15+△
|
0
|
|
|
24
|
30
|
|
|
30
|
40
|
+310
|
+170
|
+120
|
|
+80
|
+50
|
|
+25
|
|
+9
|
0
|
+10
|
+14
|
+24
|
-2+△
|
|
-9+△
|
-9
|
-17+△
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0
|
|
|
40
|
50
|
+320
|
+180
|
+130
|
|
|
50
|
65
|
+340
|
+190
|
+140
|
|
+100
|
+60
|
|
+30
|
|
+10
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0
|
+13
|
+18
|
+28
|
-2+△
|
|
-11+△
|
-11
|
-20+△
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0
|
|
|
65
|
80
|
+360
|
+200
|
+150
|
|
|
80
|
100
|
+380
|
+220
|
+170
|
|
+120
|
+72
|
|
+36
|
|
+12
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0
|
+16
|
+22
|
+34
|
-3+△
|
|
-13+△
|
-13
|
-23+△
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0
|
|
|
100
|
120
|
+410
|
+240
|
+180
|
|
|
120
|
140
|
+460
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+260
|
+200
|
|
+145
|
+85
|
|
+43
|
|
+14
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0
|
+18
|
+26
|
+41
|
-3+△
|
|
-15+△
|
-15
|
-27+△
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0
|
|
|
140
|
160
|
+520
|
+280
|
+210
|
|
|
160
|
180
|
+580
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+310
|
+230
|
|
|
180
|
200
|
+660
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+340
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+240
|
|
+170
|
+100
|
|
+50
|
|
+15
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0
|
+22
|
+30
|
+47
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-4+△
|
|
-17+△
|
-17
|
-31+△
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0
|
|
|
200
|
225
|
+740
|
+380
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+260
|
|
|
225
|
250
|
+820
|
+420
|
+280
|
|
|
250
|
280
|
+920
|
+480
|
+300
|
|
+190
|
+110
|
|
+56
|
|
+17
|
0
|
+25
|
+36
|
+55
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-4+△
|
|
-20+△
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-20
|
-34+△
|
0
|
|
|
280
|
315
|
+1050
|
+540
|
+330
|
|
|
315
|
355
|
+1200
|
+600
|
+360
|
|
+210
|
+125
|
|
+62
|
|
+18
|
0
|
+29
|
+39
|
+60
|
-4+△
|
|
-21+△
|
-21
|
-37+△
|
0
|
|
|
355
|
400
|
+1350
|
+680
|
+400
|
|
|
400
|
450
|
+1500
|
+760
|
+440
|
|
+230
|
+135
|
|
+68
|
|
+20
|
0
|
+33
|
+43
|
+66
|
-5+△
|
|
-23+△
|
-23
|
-40+△
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0
|
|
|
450
|
500
|
+1650
|
+840
|
+480
|
|
|
500
|
630
|
|
|
|
|
+260
|
+145
|
|
+76
|
|
+22
|
0
|
|
|
|
0
|
|
-26
|
-44
|
|
|
630
|
800
|
|
|
|
|
+290
|
+160
|
|
+80
|
|
+24
|
0
|
|
|
|
0
|
|
-30
|
-50
|
|
|
800
|
1000
|
|
|
|
|
+320
|
+170
|
|
+86
|
|
+26
|
0
|
|
|
|
0
|
|
-34
|
-56
|
|
|
1000
|
1250
|
|
|
|
|
+350
|
+195
|
|
+98
|
|
+28
|
0
|
|
|
|
0
|
|
-40
|
-66
|
|
|
1250
|
1600
|
|
|
|
|
+390
|
+220
|
|
+110
|
|
+30
|
0
|
|
|
|
0
|
|
-48
|
-78
|
|
|
1600
|
2000
|
|
|
|
|
+430
|
+240
|
|
+120
|
|
+32
|
0
|
|
|
|
0
|
|
-58
|
-92
|
|
|
2000
|
2500
|
|
|
|
|
+480
|
+260
|
|
+130
|
|
+34
|
0
|
|
|
|
0
|
|
-68
|
-110
|
|
|
2500
|
3150
|
|
|
|
|
+520
|
+290
|
|
+145
|
|
+38
|
0
|
|
|
|
0
|
|
-76
|
-135
|
|
|
注: 1、基本尺寸小于或等于1mm时，基本偏差A和B及大于IT8的N均不采用。2、js的偏差=  ，其中ITn是IT值数；公差带JS7至JS11，若ITn值数是奇数，则取偏差=  。 3、对小于或等于IT8的K、M、N和小于或等于IT7的P至ZC，所需△值从表内右侧选取。例如：18～30mm段的K7：△=8μm，所以ES=-2+8=+6μm，18～30mm段的S6：△=4μm，所以ES=-35+4=-31μm
4、特殊情况：250～315mm段的M6，ES=-9μm（代替-11μm）。
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