International Tolerance (IT) Grades Table Chart ISO 286-1

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International Tolerance (IT) Grades table reference ISO 286. This mechanical tolerance grade specifies tolerances with associated manufacturing processes for a given dimension.

Related: International Tolerance Grades formulas:

Application:

Most manufacturing processes have an IT Grade designated for specification. IT grades provide guidance for typical manufacturing process capability or how precise one can except manufacture of a particular features or features.

When designing a part and specifying mechanical tolerances, engineering or design will determine size and location for a particular feature. Using the designated International Tolerance Grade formula, the IT Grade required or typical to produce the part feature is assigned. For example, plastic injection molding is determined to have an IT Grade of 13 and a part needs an IT Grade of 5, engineering and design should consider an alternative and more capable manufacturing process to produce the part and feature.

Functional Tolerance Grades and Applications

Nominal
mm
Standard Tolerance Grades µm
IT01
IT0
IT1
IT2
IT3
IT4
IT5
Above
Up to
and
including
µm
—
3
0,3
0,5
0,8
1,2
2
3
4
3
6
0,4
0,6
1
1,5
2,5
4
5
6
10
0,4
0,6
1
1,5
2,5
4
6
10
18
0,5
0,8
1,2
2
3
5
8
18
30
0,6
1
1,5
2,5
4
6
9
30
50
0,6
1
1,5
2,5
4
7
11
50
80
0,8
1,2
2
3
5
8
13
80
120
1
1,5
2,5
4
6
10
15
120
180
1,2
2
3,5
5
8
12
18
180
250
2
3
4,5
7
10
14
20
250
315
2,5
4
6
8
12
16
23
315
400
3
5
7
9
13
18
25
400
500
4
6
8
10
15
20
27
500
630
-
-
9
11
16
22
32
630
800
-
-
10
13
18
25
36
800
1 000
-
-
11
15
21
28
40
1 000
1 250
-
-
13
18
24
33
47
1 250
1 600
-
-
15
21
29
39
55
1 600
2 000
-
-
18
25
35
46
65
2 000
2 500
-
-
22
30
41
55
78
2 500
3 150
-
-
26
36
50
68
96

 

Nominal
mm
 Standard Tolerance Grades µm
IT6
IT7
IT8
IT9
IT10
IT11
Above
Up to
and
including
µm
—
3
6
10
14
25
40
60
3
6
8
12
18
30
48
75
6
10
9
15
22
36
58
90
10
18
11
18
27
43
70
110
18
30
13
21
33
52
84
130
30
50
16
25
39
62
100
160
50
80
19
30
46
74
120
190
80
120
22
35
54
87
140
220
120
180
25
40
63
100
160
250
180
250
29
46
72
115
185
290
250
315
32
52
81
130
210
320
315
400
36
57
89
140
230
360
400
500
40
63
97
155
250
400
500
630
44
70
110
175
280
440
630
800
50
80
125
200
320
500
800
1 000
56
90
140
230
360
560
1 000
1 250
66
105
165
260
420
660
1 250
1 600
78
125
195
310
500
780
1 600
2 000
92
150
230
370
600
920
2 000
2 500
110
175
280
440
700
1 100
2 500
3 150
135
210
330
540
860
1 350

 

Nominal
mm
Standard Tolerance Grades mm
IT12
IT13
IT14
IT15
IT16
IT117
IT18
Above
Up to
and
including
mm
—
3
0,1
0,14
0,25
0,4
0,6
1
1,4
3
6
0,12
0,18
0,3
0,48
0,75
1,2
1,8
6
10
0,15
0,22
0,36
0,58
0,9
1,5
2,2
10
18
0,18
0,27
0,43
0,7
1,1
1,8
2,7
18
30
0,21
0,33
0,52
0,84
1,3
2,1
3,3
30
50
0,25
0,39
0,62
1
1,6
2,5
3,9
50
80
0,3
0,46
0,74
1,2
1,9
3
4,6
80
120
0,35
0,54
0,87
1,4
2,2
3,5
5,4
120
180
0,4
0,63
1
1,6
2,5
4
6,3
180
250
0,46
0,72
1,15
1,85
2,9
4,6
7,2
250
315
0,52
0,81
1,3
2,1
3,2
5,2
8,1
315
400
0,57
0,89
1,4
2,3
3,6
5,7
8,9
400
500
0,63
0,97
1,55
2,5
4
6,3
9,7
500
630
0,7
1,1
1,75
2,8
4,4
7
11
630
800
0,8
1,25
2
3,2
5
8
12,5
800
1 000
0,9
1,4
2,3
3,6
5,6
9
14
1 000
1 250
1,05
1,65
2,6
4,2
6,6
10,5
16,5
1 250
1 600
1,25
1,95
3,1
5
7,8
12,5
19,5
1 600
2 000
1,5
2,3
3,7
6
9,2
15
23
2 000
2 500
1,75
2,8
4,4
7
11
17,5
28
2 500
3 150
2,1
3,3
5,4
8,6
13,5
21
33

1) Values for standard tolerance grades IT01 and IT0 for basic sizes less than or equal to 500 mm are given in IS0 286-1, annex A, table 5.
2) Values for standard tolerance grades IT1 to IT5 (incl.) for basic sizes over 500 mm are included for experimental use.
3) Standard tolerance grades IT14 to IT18 (incl.) shall not be used for basic sizes less than or equal to 1 mm.

Related Resources:

Reference:

ISO - International Organization for Standardization ISO 286-1 - 2010(E)

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