Fundamental deviation values in micrometres
Nominal size mm
Fundamental deviation values
Lower limit deviation, EI 
Upper limit deviation, ES
Above
Up to and
including
All standard tolerance grades
IT6
IT7
IT8
Up to
and
including
IT8
Above
IT8 
Up to
and
including IT8
Above
IT8
Aa
Ba
C
CD
D
E
EF
F
FG
G
H
JS
J
Kc,d
 
Mb,c,d
 
3
+270
+140
+60
+34
+20
+14
+10
+6
+4
+2
0
Deviations = ±ITn/2, where nis the standard tolerance grade number
+2
+4
+6
0
0
−2
−2
3
6
+270
+140
+70
+46
+30
+20
+14
+10
+6
+4
0
+5
+6
+10
-1+∆
 
-4+∆
−4
6
10
+280
+150
+80
+56
+40
+25
+18
+13
+8
+5
0
+5
+8
+12
-1+∆
 
-6+∆
−6
10
14
+290
+150
+95
+70
+50
+32
+23
+16
+10
+6
0
+6
+10
+15
-1+∆
 
-7+∆
−7
14
18
 
18
24
+300
+160
+110
+85
+65
+40
+28
+20
 
+7
0
+8
+12
+20
-2+∆
 
-8+∆
−8
24
30
30
40
+310
+170
+120
+100
+80
+50
+35
+25
 
+9
0
+10
+14
+24
-2+∆
 
-9+∆
−9
40
50
+320
+180
+130
50
65
+340
+190
+140
 
+100
+60
 
+30
+15
+10
0
+13
+18
+28
-2+∆
 
-11+∆
−11
65
80
+360
+200
+150
80
100
+380
+220
+170
 
+120
+72
 
+36
 
+12
0
+16
+22
+34
-3+∆
 
-13+∆
−13
100
120
+410
+240
+180
120
140
+460
+260
+200
 
+145
+85
 
+43
 
+14
0
+18
+26
+41
-3+∆
 
-15+∆
−15
140
160
+520
+280
+210
160
180
+580
+310
+230
180
200
+660
+340
+240
 
+170
+100
 
+50
 
+15
0
+22
+30
+47
-3+∆
 
-17+∆
−17
200
225
+740
+380
+260
225
250
+820
+420
+280
250
280
+920
+480
+300
 
+190
+110
 
+56
 
+17
0
+25
+36
+55
-4+∆
 
-20+∆
−20
280
315
+1050
+540
+330
315
355
+1200
+600
+360
 
+210
+125
 
+62
 
+18
0
+29
+39
+60
-4+∆
 
-21+∆
−21
355
400
+1350
+680
+400
400
450
+1500
+760
+440
 
+230
+135
 
+68
 
+20
0
+33
+43
+66
-5+∆
 
-23+∆
−23
450
500
+1650
+840
+480
500
560
 
 
 
 
+260
+145
 
+76
 
+22
0
 
 
 
0
 
−26
560
630
630
710
 
 
 
 
+290
+160
 
+80
 
+24
0
 
 
 
0
 
−30
710
800
800
900
 
 
 
 
+320
+170
 
+86
 
+26
0
 
 
 
0
 
−34
900
1000
1000
1250
 
 
 
 
+350
+195
 
+98
 
+28
0
 
 
 
0
 
−40
1120
1400
1250
1120
 
 
 
 
+390
+220
 
+110
 
+30
0
 
 
 
0
 
−48
1400
1600
1600
1800
 
 
 
 
+430
+240
 
+120
 
+32
0
 
 
 
0
 
−58
1800
2000
2000
2240
 
 
 
 
+480
+260
 
+130
 
+34
0
 
 
 
0
 
−68
2240
2500
2500
2800
 
 
 
 
+520
+290
 
+145
 
+38
0
 
 
 
0
 
−76
2800
3150
a. Fundamental deviations A and B shall not be used for nominal sizes u1 mm.
b. Special case: for tolerance class M6 in the range above 250 mm up to and including 315 mm, ES = −9 µm (instead of –11 µm according to the calculation).
c. For determining the values K and M, click to see Establishment of limit deviations using ∆-values (EN ISO 286-1).
d. For ∆ values, see Table 3.

Tags: fundamental deviations for holes EN ISO 286-1