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Deviation ISO 286 System
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dimensions |
IT1 |
IT2 |
IT3 |
IT4 |
IT5 |
IT6 |
IT7 |
IT8 |
IT9 |
IT10 |
IT11 |
IT12 |
IT13 |
IT14 |
IT15 |
IT16 |
IT17 |
|
nominal
mm |
the tolerances are expressed in
µm
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≤ 3 |
0,8 |
1,2 |
2 |
3 |
4 |
6 |
10 |
14 |
25 |
40 |
60 |
100 |
140 |
250 |
400 |
600 |
- |
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> 3 |
≤ 6 |
1 |
1,5 |
2,5 |
4 |
5 |
8 |
12 |
18 |
30 |
48 |
75 |
120 |
180 |
300 |
480 |
750 |
- |
|
> 6 |
≤ 10 |
1 |
1,5 |
2,5 |
4 |
6 |
9 |
15 |
22 |
36 |
58 |
90 |
150 |
220 |
360 |
580 |
900 |
(1500) |
|
> 10 |
≤ 18 |
1,2 |
2 |
3 |
5 |
8 |
11 |
18 |
27 |
43 |
70 |
110 |
180 |
270 |
430 |
700 |
1100 |
(1800) |
|
> 18 |
≤ 30 |
1,5 |
2,5 |
4 |
6 |
9 |
13 |
21 |
33 |
52 |
84 |
130 |
210 |
330 |
520 |
840 |
1300 |
(2100) |
|
> 30 |
≤ 50 |
1,5 |
2,5 |
4 |
7 |
11 |
16 |
25 |
39 |
62 |
100 |
180 |
250 |
390 |
620 |
1000 |
1600 |
(2500) |
|
> 50 |
≤ 80 |
2 |
3 |
5 |
8 |
13 |
19 |
30 |
46 |
74 |
120 |
190 |
300 |
460 |
740 |
1200 |
1900 |
(3000) |
|
> 80 |
≤ 120 |
2,5 |
4 |
6 |
10 |
15 |
22 |
35 |
54 |
87 |
140 |
220 |
350 |
540 |
870 |
1400 |
2200 |
(3500) |
|
> 120 |
≤ 180 |
3,5 |
5 |
8 |
12 |
18 |
25 |
40 |
63 |
100 |
160 |
250 |
400 |
630 |
1000 |
1600 |
2500 |
(4000) |
|
> 180 |
≤ 250 |
4,5 |
7 |
10 |
14 |
20 |
29 |
46 |
72 |
115 |
185 |
290 |
460 |
720 |
1150 |
1850 |
2900 |
(4600) |
|
> 250 |
≤ 315 |
6 |
8 |
12 |
16 |
23 |
32 |
52 |
81 |
130 |
210 |
320 |
520 |
810 |
1300 |
2100 |
3200 |
(5200) |
|
> 315 |
≤ 400 |
7 |
9 |
13 |
18 |
25 |
36 |
57 |
89 |
140 |
230 |
360 |
570 |
890 |
1400 |
2300 |
3600 |
(5700) |
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the tolerances are
+0
-…
µm |
value IT is equal to the value h. Ex. IT6 ≤ h6 |
(…..) not ISO, but from UNI 6388 |
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Grade & Tolerances
Machining and Application |
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|
Class |
Limit of accuracy |
Ra |
Correspondent Mechanical Working |
Application |
|
Grade |
shafts |
holes |
mm |
shafts |
holes |
shafts |
holes |
|
IT1 - IT4 |
superfinishing |
superfinishing |
0,05 |
special-purpose machine |
special-purpose machine |
precision working of measuring instruments, gauges, slip gauges |
|
IT5 |
extra fine |
superfinishing |
0,25 |
lapping |
special-
grinding |
working for seals |
|
IT6 |
extra fine |
extra fine |
0,4 |
precision-
grinder |
precision-
grinder |
working for close fit |
|
IT7 |
accurate |
accurate |
0,8 |
extra fine of macchine tool,
grinding |
extra fine boring, fine of machine tool |
working for close fit |
|
IT8 |
mean accurate |
mean accurate |
1,6 |
fine of machine tool |
fine boring, smoot finish machine tool |
working for tight fit |
|
IT9 |
fine |
fine |
1,6 3,2 |
machine finished,
peeling-rolling, drawing |
fine boring, smoot finish machine tool |
working for loose coupling |
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IT10 |
coarse |
coarse |
3,2 2 |
turning,
peeling,
drawing |
boring-turning, drilling |
working for loose coupling |
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IT11 |
coarse |
coarse |
3,2 6,3-12,5 |
peeling,
turning |
boring-turning, drilling |
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IT12 |
very coarse |
very coarse |
25 |
press forging, rolling, hot-pressing, casting |
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IT13 |
very coarse |
very coarse |
25 |
press forging, rolling, hot-pressing, casting |
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IT14 - IT17 |
very coarse |
very coarse |
25 |
press forging, rolling, hot-pressing, casting |
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