ISO System of Limits and Fits (Tolerances) (2024)

Home	ISO System of Limits and Fits (Tolerances) Deutsche Version		Thread charts
Designation	Explanation	Designation	Explanation
zero line	It represents the nominal dimension that is referenced by the deviation and tolerances.	fundamental tolerance grade	A group of tolerances assigned to the same level of precision, e.g. IT7
fundamental deviation	The fundamental deviation determins the position of the tolerance zone with respect to the zero line.	tolerance grade	Number of the fundamental tolerance grade , e.g. 7 for the fundamental toleance grade IT7.
tolerance	Difference between the max. and the min. dimension or between the upper and lower deviation.	tolerance class	Name for a combination of a fundamental deviation and a tolerance grade, e.g. H7.
fundamental tolerance	A tolerance assigned to a fundamental tolerance grade, e.g. IT7 and a nominal dimension range , e.g. to 50 mm.	fit	Planned joining condition between hole and shaft.

ISO system of limits and fits fundamental tolerances
nominal dimension in mm		micrometer (1/1000 mm)											millimeter
over	up to	IT1	IT2	IT3	IT4	IT5	IT6	IT7	IT8	IT9	IT10	IT11	IT12	IT13	IT14	IT15	IT16	IT17	IT18
-	3	0.8	1.2	2	3	4	6	10	14	25	40	60	0.1	0.14	0.25	0.4	0.6	1.0	1.4
3	6	1	1.5	2.5	4	5	8	12	18	30	48	75	0.12	0.18	0.3	0.48	0.75	1.2	1.8
6	10	1	1.5	2.5	4	6	9	15	22	36	58	90	0.15	0.22	0.36	0.58	0.9	1.5	2.2
10	18	1.2	2	3	5	8	11	18	27	43	70	110	0.18	0.27	0.43	0.7	1.1	1.8	2.7
18	30	1.5	2.5	4	6	9	13	21	33	52	84	130	0.21	0.33	0.52	0.84	1.3	2.1	3.3
30	50	1.5	2.5	4	7	11	16	25	39	62	100	160	0.25	0.39	0.62	1.0	1.6	2.5	3.9
50	80	2	3	5	8	13	19	30	46	74	120	190	0.3	0.46	0.74	1.2	1.9	3.0	4.6
80	120	2.5	4	6	10	15	22	35	54	87	140	220	0.35	0.54	0.87	1.4	2.2	3.5	5.4
120	180	3.5	5	8	12	18	25	40	63	100	160	250	0.4	0.63	1.0	1.6	2.5	4.0	6.3
180	250	4.5	7	10	14	20	29	46	72	115	185	290	0.46	0.72	1.15	1.85	2.9	4.6	7.2
250	315	6	8	12	16	23	32	52	81	130	210	320	0.52	0.81	1.3	2.1	3.2	5.2	8.1
315	400	7	9	13	18	25	36	57	89	140	230	360	0.57	0.89	1.4	2.3	3.6	5.7	8.9
400	500	8	10	15	20	27	40	63	97	155	250	400	0.63	0.97	1.55	2.5	4.0	6.3	9.7
500	630	9	11	16	22	32	44	70	110	175	280	440	0.7	1.1	1.75	2.8	4.4	7.0	11.0
630	800	10	13	18	25	36	50	80	125	200	320	500	0.8	1.25	2.0	3.2	5.0	8.0	12.5
800	1000	11	15	21	28	40	56	90	140	230	360	560	0.9	1.4	2.3	3.6	5.6	9.0	14.0
1000	1250	13	18	24	33	47	66	105	165	260	420	660	1.05	1.65	2.6	4.2	6.6	10.5	16.5
1250	1600	15	21	29	39	55	78	125	195	310	500	780	1.25	1.95	3.1	5.0	7.8	12.5	19.5
1600	2000	18	25	35	46	65	92	150	230	370	600	920	1.5	2.3	3.7	6.0	9.2	15.0	23.0
2000	2500	22	30	41	55	78	110	175	280	440	700	1100	1.75	2.8	4.4	7.0	11.0	17.5	28.0
2500	3150	26	36	50	68	96	135	210	330	540	860	1350	2.1	3.3	5.4	8.6	13.5	21.0	33.0
do not use IT14 to IT18 for nominal dimensions of 1 mm and below

ISO system of limits and fits
basic shaft system
upper and lower limits in micrometer (0.001 mm)

over

up to

h11

js5

js6

js13

js14

- 20
- 45

- 14
- 28

- 6
- 16

- 2
- 8

0
- 4

0
- 6

0
- 10

0
- 14

0
- 25

0
- 60

+ 2
- 2

+ 3
- 3

+ 70
- 70

+ 125
- 125

+ 4
0

+ 6
0

+ 6
+ 2

+ 8
+ 2

+ 8
+ 4

+ 10
+ 4

+ 12
+ 6

+ 16
+ 10

+ 20
+ 14

+ 24
+ 14

- 30
- 60

- 20
-38

- 10
- 22

- 4
-12

0
- 5

0
- 8

0
- 12

0
- 18

0
-30

0
- 75

+ 2.5
- 2.5

+ 4
- 4

+ 90
- 90

+ 150
- 150

+ 6
+ 1

+ 9
+ 1

+ 9
+ 4

+ 12
+ 4

+13
+ 8

+ 16
+ 8

+ 20
+ 12

+ 23
+ 15

+ 27
+ 19

+ 31
+ 19

- 40
- 76

- 25
- 47

- 13
- 28

- 5
- 14

0
- 6

0
- 9

0
- 15

0
- 22

0
- 36

0
- 90

+ 3
- 3

+ 4.5
- 4.5

+ 110
-110

+ 180
- 180

+ 7
+ 1

+ 10
+ 1

+ 12
+ 6

+ 15
+ 6

+ 16
+ 10

+ 19
+ 10

+ 24
+ 15

+ 28
+ 19

+ 32
+ 23

+ 38
+23

- 50
- 93

- 32
- 59

- 16
- 34

- 6
- 17

0
- 8

0
- 11

0
- 18

0
- 27

0
- 43

0
- 110

+ 4
- 4

+ 5.5
- 5.5

+ 135
- 135

+ 215
- 215

+ 9
+ 1

+ 12
+ 1

+ 15
+ 7

+ 18
+ 7

+ 20
+ 12

+ 23
+ 12

+ 29
+ 18

+ 34
+ 23

+ 39
+ 28

+ 46
+28

- 65
-117

- 40
- 73

- 20
- 41

- 7
- 20

0
- 9

0
- 13

0
- 21

0
- 33

0
- 52

0
- 130

+ 4.5
- 4.5

+ 6.5
- 6.5

+ 165
- 165

+ 260
- 260

+ 11
+ 2

+ 15
+ 2

+ 17
+ 8

+ 21
+ 8

+ 24
+ 15

+ 28
+ 15

+ 35
+ 22

+ 41
+ 28

+ 48
+ 35

+ 56
+ 35

- 80
- 142

- 50
- 89

- 25
- 50

- 9
- 25

0
- 11

0
- 16

0
- 25

0
- 39

0
- 62

0
- 160

+ 5.5
- 5.5

+ 8
- 8

+ 195
- 195

+ 310
- 310

+ 13
+ 2

+ 18
+ 2

+ 20
+ 9

+ 25
+ 9

+ 28
+ 17

+ 33
+ 17

+ 42
+ 26

+ 50
+ 34

+ 59
+ 43

+ 68
+ 43

- 100
- 174

- 60
- 106

- 30
- 60

- 10
- 29

0
- 13

0
- 19

0
- 30

0
- 46

0
- 74

0
- 190

+ 6.5
- 6.5

+ 9.5
- 9.5

+ 230
- 230

+ 370
- 370

+ 15
+ 2

+ 21
+ 2

+ 24
+ 11

+ 30
+ 11

+ 33
+ 20

+ 39
+ 20

+ 51
+ 32

+ 60
+ 41

+ 72
+ 53

+ 83
+ 53

- 100
- 174

- 60
- 106

- 30
- 60

- 10
- 29

0
- 13

0
- 19

0
- 30

0
- 46

0
- 74

0
- 190

+ 6.5
- 6.5

+ 9.5
- 9.5

+ 230
- 230

+ 370
- 370

+ 15
+ 2

+ 21
+ 2

+ 24
+ 11

+ 30
+ 11

+ 33
+ 20

+ 39
+ 20

+ 51
+ 32

+ 62
+ 43

+ 78
+ 59

+ 89
+ 59

100

- 120
- 207

- 72
- 126

- 36
- 71

- 12
- 34

0
- 15

0
- 22

0
- 35

0
- 54

0
- 87

0
- 220

+ 7.5
- 7.5

+ 11
- 11

+ 270
- 270

+ 435
- 435

+ 18
+ 3

+ 25
+ 3

+ 28
+ 13

+ 35
+ 13

+ 38
+ 23

+ 45
+ 23

+ 59
+ 37

+ 73
+ 51

+ 93
+ 71

+ 106
+ 71

100

120

- 120
- 207

- 72
- 126

- 36
- 71

- 12
- 34

0
- 15

0
- 22

0
- 35

0
- 54

0
- 87

0
- 220

+ 7.5
- 7.5

+ 11
- 11

+ 270
- 270

+ 435
- 435

+ 18
+ 3

+ 25
+ 3

+ 28
+ 13

+ 35
+ 13

+ 38
+ 23

+ 45
+ 23

+ 59
+ 37

+ 76
+ 54

+ 101
+ 79

+ 114
+ 79

120

140

-145
- 245

- 85
- 148

- 43
- 83

- 14
- 39

0
- 18

0
- 25

0
- 40

0
- 63

0
- 100

0
- 250

+ 9
- 9

+ 12.5
- 12.5

+ 315
- 315

+ 500
- 500

+ 21
+ 3

+ 28
+ 3

+ 33
+ 15

+ 40
+ 15

+ 45
+ 27

+ 52
+ 27

+ 68
+ 43

+ 88
+ 63

+ 117
+ 92

+ 132
+ 92

140

160

+ 90
+ 65

+ 125
+ 100

+ 140
+ 100

160

180

+ 93
+ 68

+ 133
+ 108

+ 148
+ 108

180

200

- 170
- 285

- 100
- 172

- 50
- 96

- 15
- 44

0
- 20

0
- 29

0
- 46

0
- 72

0
- 115

0
- 290

+ 10
- 10

+ 14.5
- 14.5

+ 360
- 360

+ 575
- 575

+ 24
+ 4

+ 33
+ 4

+ 37
+ 17

+ 46
+ 17

+ 51
+ 31

+ 60
+ 31

+ 79
+ 50

+ 106
+ 77

+ 151
+ 122

+ 168
+ 122

200

225

+ 109
+ 80

+ 159
+ 130

+ 176
+ 130

225

250

+ 113
+ 84

+ 169
+ 140

+ 186
+ 140

250

280

-190
- 320

- 110
- 191

- 56
- 108

- 17
- 49

0
- 23

0
- 32

0
- 52

0
- 81

0
- 130

0
- 320

+ 11.5
- 11.5

+ 16
- 16

+ 405
- 405

+ 650
- 650

+ 27
+ 4

+ 36
+ 4

+ 43
+ 20

+ 52
+ 20

+ 57
+ 34

+ 66
+ 34

+ 88
+ 56

+ 126
+ 94

+ 190
+ 158

+ 210
+ 158

280

315

+ 130
+ 98

+ 202
+ 170

+ 222
+ 170

315

355

- 210
-350

- 125
- 214

- 62
- 119

- 18
- 54

0
- 25

0
- 36

0
- 57

0
- 89

0
- 140

0
- 360

+ 12.5
- 12.5

+ 18
- 18

+ 445
- 445

+ 700
- 700

+ 29
+ 4

+ 40
+ 4

+ 46
+ 21

+ 57
+ 21

+ 62
+ 37

+ 73
+ 37

+ 98
+ 62

+ 144
+ 108

+ 226
+ 190

+ 247
+ 190

355

400

+ 150
+ 114

+ 244
+ 208

+ 265
+ 208

ISO system of limits and fits
basic hole system
upper and lower limits in micrometer (0.001 mm)

over

up to

D10

H11

H12

H13

JS7

JS9

+ 60
+ 20

+ 39
+ 14

+ 16
+ 6

+ 20
+ 10

+ 12
+ 2

+ 27
+ 2

+ 6
0

+ 10
0

+ 14
0

+ 25
0

+ 60
0

+ 100
0

+ 140
0

+5
- 5

+ 12.5
- 12.5

0
- 6

0
- 10

- 2
- 8

- 2
- 12

- 4
- 14

- 4
- 29

- 6
- 16

- 6
- 31

- 10
- 20

+ 78
+ 30

+ 50
+ 20

+ 22
+ 10

+ 28
+ 10

+ 16
+ 4

+ 34
+ 4

+ 8
0

+ 12
0

+ 18
0

+ 30
0

+ 75
0

+ 120
0

+ 180
0

+ 6
- 6

+ 15
- 15

+ 2
- 6

+ 3
- 9

- 1
- 9

0
- 12

- 4
- 16

0
- 30

- 8
- 20

- 12
- 42

- 11
- 23

+ 98
+ 40

+ 61
+ 25

+ 28
+ 13

+ 35
+ 13

+ 20
+ 5

+ 41
+ 5

+ 9
0

+ 15
0

+ 22
0

+ 36
0

+ 90
0

+ 150
0

+ 220
0

+ 7.5
- 7.5

+ 18
-18

+ 2
- 7

+ 5
- 10

- 3
- 12

0
- 15

- 4
- 19

0
- 36

- 9
- 24

- 15
- 51

- 13
- 28

+ 120
+ 50

+ 75
+ 32

+ 34
+ 16

+ 43
+ 16

+ 24
+ 6

+ 49
+ 6

+ 11
0

+ 18
0

+ 27
0

+ 43
0

+ 110
0

+ 180
0

+ 270
0

+ 9
- 9

+ 21.5
- 21.5

+ 2
- 9

+ 6
- 12

- 4
-15

0
- 18

- 5
- 23

0
- 43

- 11
- 29

- 18
- 61

- 16
- 34

+ 149
+ 65

+ 92
+ 40

+ 41
+ 20

+ 53
+ 20

+ 28
+ 7

+ 59
+ 7

+ 13
0

+ 21
0

+ 33
0

+ 52
0

+ 130
0

+ 210
0

+ 330
0

+ 10.5
- 10.5

+ 26
- 26

+ 2
- 11

+ 6
- 15

- 4
- 17

0
- 21

- 7
- 28

0
- 52

- 14
- 35

- 22
- 74

- 20
- 41

+ 180
+80

+ 112
+ 50

+ 50
+ 25

+ 64
+ 25

+ 34
+ 9

+ 71
+ 9

+ 16
0

+ 25
0

+ 39
0

+ 62
0

+ 160
0

+ 250
0

+ 390
0

+ 12.5
- 12.5

+ 31
- 31

+ 3
- 13

+ 7
- 18

- 4
- 20

0
- 25

- 8
-33

0
- 62

- 17
- 42

- 26
- 88

- 25
-50

+ 220
+ 100

+ 134
+ 60

+ 60
+ 30

+ 76
+ 30

+ 40
+ 10

+ 19
0

+ 30
0

+ 46
0

+ 74
0

+ 190
0

+ 300
0

+ 460
0

+ 15
- 15

+ 37
- 37

+ 4
- 15

+ 9
- 21

- 5
- 24

0
- 30

- 9
- 39

0
- 74

- 21
- 51

- 32
- 106

- 30
- 60

+ 220
+ 100

+ 134
+ 60

+ 60
+ 30

+ 76
+ 30

+ 40
+ 10

+ 19
0

+ 30
0

+ 46
0

+ 74
0

+ 190
0

+ 300
0

+ 460
0

+ 15
- 15

+ 37
- 37

+ 4
- 15

+ 9
- 21

- 5
- 24

0
- 30

- 9
- 39

0
- 74

- 21
- 51

- 32
- 106

- 32
- 62

100

+ 260
+ 120

+ 159
+ 72

+ 71
+ 36

+ 90
+ 36

+ 47
+ 12

+ 22
0

+ 35
0

+ 54
0

+ 87
0

+ 220
0

+ 350
0

+ 540
0

+ 17.5
- 17.5

+ 43.5
- 43.5

+ 4
- 18

+ 10
- 25

- 6
- 28

0
- 35

- 10
- 45

0
- 87

- 24
- 59

- 37
- 124

- 38
- 73

100

120

+ 260
+ 120

+ 159
+ 72

+ 71
+ 36

+ 90
+ 36

+ 47
+ 12

+ 22
0

+ 35
0

+ 54
0

+ 87
0

+ 220
0

+ 350
0

+ 540
0

+ 17.5
- 17.5

+ 43.5
- 43.5

+ 4
- 18

+ 10
- 25

- 6
- 28

0
- 35

- 10
- 45

0
- 87

- 24
- 59

- 37
- 124

- 41
- 76

120

140

+ 305
+ 145

+ 185
+ 85

+ 83
+ 43

+ 106
+ 43

+ 54
+ 14

+ 25
0

+ 40
0

+ 63
0

+ 100
0

+ 250
0

+ 400
0

+ 630
0

+ 20
- 20

+ 50
- 50

+ 4
- 21

+ 12
- 28

- 8
- 33

0
- 40

- 12
- 52

0
- 100

- 28
- 68

- 43
- 143

- 48
- 88

140

160

- 50
- 90

160

180

- 53
- 93

180

200

+ 335
+ 170

+ 215
+ 110

+ 96
+ 50

+ 122
+ 50

+ 61
+ 15

+ 29
0

+ 46
0

+ 72
0

+ 115
0

+ 290
0

+ 460
0

+ 720
0

+ 23
- 23

+ 57.5
- 57.5

+ 5
- 24

+ 13
- 33

- 8
- 37

0
- 46

- 14
- 60

0
- 115

- 33
- 79

- 50
- 165

- 60
- 106

200

225

- 63
- 109

225

250

- 67
- 113

250

280

+ 400
+ 190

+ 240
+ 110

+ 108
+ 56

+ 137
+ 56

+ 69
+ 17

+ 32
0

+ 52
0

+ 81
0

+ 130
0

+ 320
0

+ 520
0

+ 810
0

+ 26
- 26

+ 65
- 65

+ 5
- 27

+ 16
- 36

- 9
- 41

0
- 52

- 14
- 66

0
- 130

- 36
- 88

- 56
- 186

- 74
- 126

280

315

- 78
- 130

315

355

+ 440
+ 210

+ 265
+ 125

+ 119
+ 62

+ 151
+ 62

+ 75
+ 18

+ 36
0

+ 57
0

+ 89
0

+ 140
0

+ 360
0

+ 570
0

+ 890
0

+ 28.5
- 28.5

+ 70
- 70

+ 7
- 29

+ 17
- 40

-10
- 46

0
- 57

- 16
- 73

0
- 140

- 41
- 98

- 62
- 202

- 87
- 144

355

400

- 93
- 150

do not use N9 for nominal dimensions of 1 mm or below

	recommended fits
basic hole	clearance fits	basic shaft
H8/d9	loose running fit: clearance allows for loose fit of parts	D10/h9
H8/e8	free running fit: sufficient clearance is allowed for ease of assembly	E9/h9
H8/f7	close running fit: clearance allows for parts to be easily assembled by hand while maintaining location accuracy	F8/h9
H7/f7	sliding fit - free: clearance allows accurate location and free movement, including turning	F8/h6
H7/g6	sliding fit - constrained: cleaance allows better location accuracy while still allowing sliding or turning movement	G7/h6
H8/h9	minimal clearance fit: allows location accuracy and hand force assembly without being a snug fit	H8/h9
H7/h6	locational clearance fit: Allows snug fit of stationary parts that may be assembled by hand force	H7/h6
	transition fits
H7/j6	locational transition fit: for accurate location allowing more clearance than interference	not specified
H7/n6	locational transition fit - interference: For accurate location where interference is permissible	not specified
	interference fits
H7/r6	locational interference fit: for rigidity and alignment/accurate location without special bore requirements	not specified
H7/s6	medium drive fit: for ordinary steel parts or shrink fits of light sections, tightest fit possible for cast iron
H8/u8	force fit: for parts fitting that can withstand high mechanical pressing force or shrink fitting
H8/x8	extreme force fit: for parts that can only be assembled by stretching or shrinking

general tolerances for linear and angular dimensions tolerances for cutting and forming processes
	linear dimensions mm
tolerance class	0.5 to 3	over 3 to 6	over 6 to 30	over 30 to 120	over 120 to 400	over 400 to 1000	over 1000 to 2000	over 2000 to 4000
f (fine)	+/- 0.05	+/- 0.05	+/- 0.1	+/- 0.15	+/- 0.2	+/- 0.3	+/- 0.5	-
m (medium)	+/- 0.1	+/- 0.1	+/- 0.2	+/- 0.3	+/- 0.5	+/- 0.8	+/- 1.2	+/- 2.0
c (coarse)	+/- 0.2	+/- 0.3	+/- 0.5	+/- 0.8	+/- 1.2	+/- 2.0	+/- 3.0	+/- 4.0
v (very coarse)	-	+/- 0.5	+/- 1.0	+/- 1.5	+/- 2.5	+/- 4.0	+/- 6.0	+/- 8.0

	radii and chamfers			angular dimensions (nominal dimensions for the shorter angle leg)
	0.5 to 3	over 3 to 6	over 6	up to 10	over 10 to 50	over 50 to 120	over 120 to 400	over 400
f (fine)	+/- 0.2	+/- 0.5	+/- 1.0	+/- 1°	+/- 0° 30'	+/- 0° 20'	+/- 0° 10'	+/- 0° 5'
m (medium)	+/- 0.2	+/- 0.5	+/- 1.0	+/- 1°	+/- 0° 30'	+/- 0° 20'	+/- 0° 10'	+/- 0° 5'
c (coarse)	+/- 0.4	+/- 1.0	+/- 2.0	+/- 1° 30'	+/- 1°	+/- 0° 30'	+/- 0° 15'	+/- 0° 10'
v (very coarse)	+/- 0.4	+/- 1.0	+/- 2.0	+/- 3°	+/- 2°	+/- 1°	+/- 0° 30'	+/- 0° 20'

general tolerances for shape and position
	straightness and flatness nominal dimensions in mm						circular runout
	up to 10	over 10 to 30	over 30 to 100	over 100 to 300	over 300 to 1000	over 1000 to 3000
H	0.02	0.05	0.1	0.2	0.3	0.4	0.1
K	0.05	0.1	0.2	0.4	0.6	0.8	0.2
L	0.1	0.2	0.4	0.8	1.2	1.6	0.5

	perpendicularity (nominal dimensions for the shorter leg)				symmetry
	up to 100	over 100 to 300	over 300 to 1000	over 1000 to 3000	up to 100	over 100 to 300	over 300 to 1000	over 1000 to 3000
H	0.2	0.3	0.4	0.5	0.5	0.5	0.5	0.5
K	0.4	0.6	0.8	1.0	0.6	0.6	0.8	1.0
L	0.6	1.0	1.5	2.0	0.6	1.0	1.5	2.0

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Recommended books:
Europa Lehrmittel, Mechanical and Metal Trades Handbook, ISBN 978-3-8085-1913-4
Europa Lehrmittel, Fachkunde Metall, ISBN 978-3-8085-1156-5
Europa Lehrmittel, Tabellenbuch Metall, ISBN 978-3-8085-1725-3
SNV Normenauszug, ISBN 978-3-03709-049-7

Robert Pfeffer
CH-8194 Hüntwangen

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