Dimensional Tolerances - Home Teachers India

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Thursday 30 March 2023

Dimensional Tolerances

These tolerances are added to dimensional measurements, and are the upper and lower deviation of the two threshold values. Nominal dimension forms the basis for the selection of deviation differences.

1.a. ISO Tolerances for Bores (ISO 286-2)

ISO bore tolerance values are shown in Î¼m (micrometer) units.

Dimension
(mm)

E7

E10

E11

E12

F6

F7

F8

G6

G7

H6

H7

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

3
6
10
18

6
10
18
30

+32
+40
+50
+61

+20
+25
+32
+40

+68
+83
+102
+124

+20
+25
+32
+40

+95
+115
+142
+170

+20
+25
+32
+40

+140
+175
+212
+250

+20
+25
+32
+40

+18
+22
+27
+33

+10
+13
+16
+20

+22
+28
+34
+41

+10
+13
+16
+20

+28
+35
+43
+53

+10
+13
+16
+20

+12
+14
+17
+20

+4
+5
+6
+7

+16
+20
+24
+28

+4
+5
+6
+7

+8
+9
+11
+13

0
0
0
0

+12
+15
+18
+21

0
0
0
0

30
40

40
50

+75

+50

+150

+50

+210

+50

+300

+50

+41

+25

+50

+25

+64

+25

+25

+9

+34

+9

+16

0

+25

0

50
65

65
80

+90

+60

+180

+60

+250

+60

+360

+60

+49

+30

+60

+30

+76

+30

+29

+10

+40

+10

+19

0

+30

0

80
100

100
120

+107

+72

+212

+72

+292

+72

+422

+72

+58

+36

+71

+36

+90

+36

+34

+12

+47

+12

+22

0

+35

0

120
140
160

140
160
180

+125

+85

+245

+85

+335

+85

+485

+85

+68

+43

+83

+43

+106

+43

+39

+14

+54

+14

+25

0

+40

0

180
200
225

200
225
250

+146

+100

+285

+100

+390

+100

+560

+100

+79

+50

+96

+50

+122

+50

+44

+15

+61

+15

+29

0

+46

0

250
280

280
315

+146

+110

+320

+110

+430

+110

+630

+110

+88

+56

+108

+56

+137

+56

+49

+17

+69

+17

+32

0

+52

0

315
355

355
400

+182

+125

+355

+125

+485

+125

+695

+125

+98

+62

+119

+62

+151

+62

+54

+18

+75

+18

+36

0

+57

0

400
450

450
500

+198

+135

+385

+135

+535

+135

+765

+135

+108

+68

+131

+68

+165

+68

+60

+20

+83

+20

+40

0

+63

0

500
560

560
630

+215

+145

+120

+76

+146

+76

+186

+76

+66

+22

+92

+22

+44

0

+70

0

630
710

710
800

+240

+160

+130

+80

+160

+80

+205

+80

+74

+24

+104

+24

+50

0

+80

0

800
900

900
1000

+260

+170

+142

+86

+176

+86

+226

+86

+82

+26

+116

+26

+56

0

+90

0

1000
1120

1120
1250

+300

+195

+164

+98

+203

+98

+263

+98

+94

+28

+133

+28

+66

0

+105

0

1250
1400

1400
1600

+345

+220

+188

+110

+235

+110

+305

+110

+108

+30

+155

+30

+78

0

+125

0

1600
1800

1800
2000

+390

+240

+212

+120

+270

+120

+350

+120

+124

+32

+182

+32

+92

0

+150

0

 

Dimension
(mm)

H8

H9

H10

H11

H13

J6

Js6

J7

Js7

K5

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

3
6
10
18

6
10
18
30

+18
+22
+27
+33

0
0
0
0

+30
+36
+43
+52

0
0
0
0

+48
+58
+70
+84

0
0
0
0

+75
+90
+110
+130

0
0
0
0

+180
+220
+270
+330

0
0
0
0

+5
+5
+6
+8

-3
-4
-5
-5

+4
+4.5
+5.5
+6.5

-4
-4.5
-5.5
-6.5

+6
+8
+10
+12

-6
-7
-8
-9

+6
+7.5
+9
+10.5

-6
-7.5
-9
-10.5

0
+1
+2
+1

-5
-5
-6
-8

30
40

40
50

+39

0

+62

0

+100

0

+160

0

+390

0

+10

-6

+8

-8

+14

-11

+12.5

-12.5

+2

-9

50
65

65
80

+46

0

+74

0

+120

0

+190

0

+460

0

+13

-6

+9.5

-9.5

+18

-12

+15

-15

+3

-10

80
100

100
120

+54

0

+87

0

+140

0

+220

0

+540

0

+16

-6

+11

-11

+22

-13

+17.5

-17.5

+2

-13

120
140
160

140
160
180

+63

0

+100

0

+160

0

+250

0

+630

0

+18

-7

+12.5

-12.5

+26

-14

+20

-20

+3

-15

180
200
225

200
225
250

+72

0

+115

0

+185

0

+290

0

+720

0

+22

-7

+14.5

-14.5

+30

-16

+23

-23

+2

-18

250
280

280
315

+81

0

+130

0

+210

0

+320

0

+810

0

+25

-7

+16

-16

+36

-16

+26

-26

+3

-20

315
355

355
400

+89

0

+140

0

+230

0

+360

0

+890

0

+29

-7

+18

-18

+39

-18

+28.5

-28.5

+3

-22

400
450

450
500

+97

0

+155

0

+250

0

+400

0

+970

0

+33

-7

+20

-20

+43

-20

+31.5

-31.5

+2

-25

500
560

560
630

+110

0

+175

0

+280

0

+440

0

+22

-22

+35

-35

630
710

710
800

+125

0

+200

0

+320

0

+500

0

+25

-25

+40

-40

800
900

900
1000

+140

0

+230

0

+360

0

+560

0

+28

-28

+45

-45

1000
1120

1120
1250

+165

0

+260

0

+420

0

+660

0

+33

-33

+52.5

-52.5

1250
1400

1400
1600

+195

0

+310

0

+500

0

+780

0

+39

-39

+62.5

-62.5

1600
1800

1800
2000

+230

0

+370

0

+600

0

+920

0

+46

-46

+75

-75

 

Dimension
(mm)

K6

K7

M6

M7

N6

N7

P6

P7

R6

R7

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

3
6
10
18

6
10
18
30

+2
+2
+2
+2

-6
-7
-9
-11

+3
+5
+6
+6

-9
-10
-12
-15

-1
-3
-4
-4

-9
-12
-15
-17

0
0
0
0

-12
-15
-18
-21

-5
-7
-9
-11

-13
-16
-20
-24

-4
-4
-5
-7

-16
-19
-23
-28

-9
-12
-15
-18

-17
-21
-26
-31

-8
-9
-11
-14

-20
-24
-29
-35

-12
-16
-20
-24

-20
-25
-31
-37

-11
-13
-16
-20

-23
-28
-34
-41

30
40

40
50

+3

-13

+7

-18

-4

-20

0

-25

-12

-28

-8

-33

-21

-37

-17

-42

-29

-45

-25

-50

50
65

65
80

+4

-15

+9

-21

-5

-24

0

-30

-14

-33

-9

-39

-26

-45

-21

-51

-35
-37

-54
-56

-30
-32

-60
-62

80
100

100
120

+4

-18

+10

-25

-6

-28

0

-35

-16

-38

-10

-45

-30

-52

-24

-59

-44
-47

-66
-69

-38
-41

-73
-76

120
140
160

140
160
180

+4

-21

+12

-28

-8

-33

0

-40

-20

-45

-12

-52

-36

-61

-28

-68

-56
-58
-61

-81
-83
-86

-48
-50
-53

-88
-90
-93

180
200
225

200
225
250

+5

-24

+13

-33

-8

-37

0

-46

-22

-51

-14

-60

-41

-70

-33

-79

-68
-71
-75

-97
-100
-104

-60
-63
-67

-106
-109
-113

250
280

280
315

+5

-27

+16

-36

-9

-41

0

-52

-25

-57

-14

-66

-47

-79

-36

-88

-85
-89

-117
-121

-74
-78

-126
-130

315
355

355
400

+7

-29

+17

-40

-10

-46

0

-57

-26

-62

-16

-73

-51

-87

-41

-98

-97
-103

-133
-139

-87
-93

-144
-150

400
450

450
500

+8

-32

+18

-45

-10

-50

0

-63

-27

-67

-17

-80

-55

-95

-45

-108

-113
-119

-153
-159

-103
-109

-166
-172

500
560

560
630

0

-44

0

-70

-26

-70

-26

-96

-44

-88

-44

-114

-78

-122

-78

-148

-150
-155

-194
-199

-150
-155

-220
-225

630
710

710
800

0

-50

0

-80

-30

-80

-30

-110

-50

-100

-50

-130

-88

-138

-88

-168

-175
-185

-225
-235

-175
-185

-255
-265

800
900

900
1000

0

-56

0

-90

-34

-90

-34

-124

-56

-112

-56

-146

-100

-156

-100

-190

-210
-220

-266
-276

-210
-220

-300
-310

1000
1120

1120
1250

0

-66

0

-105

-40

-106

-40

-145

-66

-132

-66

-171

-120

-186

-120

-225

-250
-260

-316
-326

-250
-260

-355
-365

1250
1400

1400
1600

0

-78

0

-125

-48

-126

-48

-173

-78

-156

-78

-203

-140

-218

-140

-265

-300
-330

-378
-408

-300
-330

-425
-455

1600
1800

1800
2000

0

-92

0

-150

-58

-150

-58

-208

-92

-184

-92

-242

-170

-262

-170

-320

-370
-400

-462
-492

-370
-400

-520
-550

 

 

1.b. ISO Tolerances for Shafts (ISO 286-2)

ISO shaft tolerance values are shown in Î¼m (micrometer) units.

Dimension
(mm)

a13

c12

d6

e6

e13

f5

f6

g5

g6

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

3
6
10
18

6
10
18
30

-270
-280
-290
-300

-450
-500
-560
-630

-70
-80
-95
-110

-190
-230
-275
-320

-30
-40
-50
-65

-38
-49
-61
-78

-20
-25
-32
-40

-28
-34
-43
-53

-20
-25
-32
-40

-200
-245
-302
-370

-10
-13
-16
-20

-15
-19
-24
-29

-10
-13
-16
-20

-18
-22
-27
-33

-4
-5
-6
-7

-9
-11
-14
-16

-4
-5
-6
-7

-12
-14
-17
-20

30
40

40
50

-310
-320

-700
-710

-120
-130

-370
-380

-80

-96

-50

-66

-50

-440

-25

-36

-25

-41

-9

-20

-9

-25

50
65

65
80

-340
-360

-800
-820

-140
-150

-440
-450

-100

-119

-60

-79

-60

-520

-30

-43

-30

-49

-10

-23

-10

-29

80
100

100
120

-380
-410

-920
-950

-170
-180

-520
-530

-120

-142

-72

-94

-72

-612

-36

-51

-36

-58

-12

-27

-12

-34

120
140
160

140
160
180

-460
-520
-580

-1090
-1150
-1210

-200
-210
-230

-600
-610
-630

-145

-170

-85

-110

-85

-715

-43

-61

-43

-68

-14

-32

-14

-39

180
200
225

200
225
250

-660
-740
-820

-1380
-1460
-1540

-240
-260
-280

-700
-720
-740

-170

-199

-100

-129

-100

-820

-50

-70

-50

-79

-15

-35

-15

-44

250
280

280
315

-920
-1050

-1730
1860

-300
-330

-820
-850

-190

-222

-110

-142

-110

-920

-56

-79

-56

-88

-17

-40

-17

-49

315
355

355
400

-1200
-1350

-2090
-2240

-360
-400

-930
-970

-210

-246

-125

-161

-125

-1015

-62

-87

-62

-98

-18

-43

-18

-54

400
450

450
500

-1550
-1650

-2470
-2620

-440
-480

-1070
-1110

-230

-270

-135

-175

-135

-1105

-68

-95

-68

-108

-20

-47

-20

-60

500
560

560
630

-260

-304

-145

-189

-76

-120

-22

-66

630
710

710
800

-290

-340

-160

-210

-80

-130

-24

-74

800
900

900
1000

-320

-376

-170

-226

-86

-142

-26

-82

1000
1120

1120
1250

-350

-416

-195

-261

-98

-164

-28

-94

1250
1400

1400
1600

-390

-468

-220

-298

-110

-188

-30

-108

 

Dimension
(mm)

h4

h5

h6

h7

h8

h9

h10

h11

h13

js4

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

3
6
10
18

6
10
18
30

0
0
0
0

-4
-4
-5
-6

0
0
0
0

-5
-6
-8
-9

0
0
0
0

-8
-9
-11
-13

0
0
0
0

-12
-15
-18
-21

0
0
0
0

-18
-22
-27
-33

0
0
0
0

-30
-36
-43
-52

0
0
0
0

-48
-58
-70
-84

0
0
0
0

-75
-90
-110
-130

0
0
0
0

-180
-220
-270
-330

+2
+2
+2.5
+3

-2
-2
-2.5
-3

30
40

40
50

0

-7

0

-11

0

-16

0

-25

0

-39

0

-62

0

-100

0

-160

0

-390

+3.5

-3.5

50
65

65
80

0

-8

0

-13

0

-19

0

-30

0

-46

0

-74

0

-120

0

-190

0

-460

+4

-4

80
100

100
120

0

-10

0

-15

0

-22

0

-35

0

-54

0

-87

0

-140

0

-220

0

-540

+5

-5

120
140
160

140
160
180

0

-12

0

-18

0

-25

0

-40

0

-63

0

-100

0

-160

0

-250

0

-630

+6

-6

180
200
225

200
225
250

0

-14

0

-20

0

-29

0

-46

0

-72

0

-115

0

-185

0

-290

0

-720

+7

-7

250
280

280
315

0

-16

0

-23

0

-32

0

-52

0

-81

0

-130

0

-210

0

-320

0

-810

+8

-8

315
355

355
400

0

-18

0

-25

0

-36

0

-57

0

-89

0

-140

0

-230

0

-360

0

-890

+9

-9

400
450

450
500

0

-20

0

-27

0

-40

0

-63

0

-97

0

-155

0

-250

0

-400

0

-970

+10

-10

500
560

560
630

0

-44

0

-70

0

-110

0

-175

0

-280

0

-440

630
710

710
800

0

-50

0

-80

0

-125

0

-200

0

-320

0

-500

800
900

900
1000

0

-56

0

-90

0

-140

0

-230

0

-360

0

-560

1000
1120

1120
1250

0

-66

0

-105

0

-165

0

-260

0

-420

0

-660

1250
1400

1400
1600

0

-78

0

-125

0

-195

0

-310

0

-500

0

-780

 

Dimension
(mm)

j5

js5

j6

js6

j7

k4

k5

k6

m5

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

3
6
10
18

6
10
18
30

+3
+4
+5
+5

-2
-2
-3
-4

+2.5
+3
+4
+4.5

-2.5
-3
-4
-4.5

+6
+7
+8
+9

-2
-2
-3
-4

+4
+4.5
+5.5
+6.8

-4
-4.5
-5.5
-6.8

+8
+10
+12
+13

-4
-5
-6
-8

+5
+5
+6
+8

+1
+1
+1
+2

+6
+7
+9
+11

+1
+1
+1
+2

+9
+10
+12
+15

+1
+1
+1
+2

+9
+12
+15
+17

+4
+6
+7
+8

30
40

40
50

+6

-5

+5.5

-5.5

+11

-5

+8

-8

+15

-10

+9

+2

+13

+2

+18

+2

+20

+9

50
65

65
80

+6

-7

+6.5

-6.5

+12

-7

+9.5

-9.5

+18

-12

+10

+2

+15

+2

+21

+2

+24

+11

80
100

100
120

+6

-9

+7.5

-7.5

+13

-9

+11

-11

+20

-15

+13

+3

+18

+3

+25

+3

+28

+13

120
140
160

140
160
180

+7

-11

+9

-9

+14

-11

+12.5

-12.5

+22

-18

+15

+3

+21

+3

+28

+3

+33

+15

180
200
225

200
225
250

+7

-13

+10

-10

+16

-13

+14.5

-14.5

+25

-21

+18

+4

+24

+4

+33

+4

+37

+17

250
280

280
315

+7

-16

+11.5

-11.5

+16

-16

+16

-16

+26

-26

+20

+4

+27

+4

+36

+4

+43

+20

315
355

355
400

+7

-18

+12.5

-12.5

+18

-18

+18

-18

+29

-28

+22

+4

+29

+4

+40

+4

+46

+21

400
450

450
500

+7

-20

+13.5

-13.5

+20

-20

+20

-20

+31

-32

+25

+5

+32

+5

+45

+5

+50

+23

500
560

560
630

+22

-22

+44

0

630
710

710
800

+25

-25

+50

0

800
900

900
1000

+28

-28

+56

0

1000
1120

1120
1250

+33

-33

+66

0

1250
1400

1400
1600

+39

-39

+78

0

 

Dimension
(mm)

m6

n5

n6

p5

p6

r6

r7

Base Tolerance

Over

Incl.

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

IT2

IT3

IT5

IT7

3
6
10
18

6
10
18
30

+12
+15
+18
+21

+4
+6
+7
+8

+13
+16
+20
+24

+8
+10
+12
+15

+16
+19
+23
+28

+8
+10
+12
+15

+17
+21
+26
+31

+12
+15
+18
+22

+20
+24
+29
+35

+12
+15
+18
+22

+23
+28
+34
+41

+15
+19
+23
+28

+27
+34
+41
+49

+15
+19
+23
+28

1.5
1.5
2
2.5

2.5
2.5
3
4

5
6
8
9

12
15
18
21

30
40

40
50

+25

+9

+28

+17

+33

+17

+37

+26

+42

+26

+50

+34

+59

+34

2.5

4

11

25

50
65

65
80

+30

+11

+33

+20

+39

+20

+45

+32

+51

+32

+60
+62

+41
+43

+71
+73

+41
+43

3

5

13

30

80
100

100
120

+35

+13

+38

+23

+45

+23

+52

+37

+59

+37

+73
+76

+51
+54

+86
+89

+51
+54

4

6

15

35

120
140
160

140
160
180

+40

+15

+45

+27

+52

+27

+61

+43

+68

+43

+88
+90
+93

+63
+65
+68

+103
+105
+108

+63
+65
+68

5

8

18

40

180
200
225

200
225
250

+46

+17

+51

+31

+60

+31

+70

+50

+79

+50

+106
+109
+113

+77
+80
+84

+123
+126
+130

+77
+80
+84

7

10

20

46

250
280

280
315

+52

+20

+57

+34

+66

+34

+79

+56

+88

+56

+126
+130

+94
+98

+146
+150

+94
+98

8

12

23

52

315
355

355
400

+57

+21

+62

+37

+73

+37

+87

+62

+98

+62

+144
+150

+108
+114

+165
+171

+108
+114

9

13

25

57

400
450

450
500

+63

+23

+67

+40

+80

+40

+95

+68

+108

+68

+166
+172

+126
+132

+189
+195

+126
+132

10

15

27

63

500
560

560
630

+70

+26

+88

+44

+122

+78

+194
+199

+150
+155

+220
+225

+150
+155

70

630
710

710
800

+80

+30

+100

+50

+138

+88

+225
+235

+175
+185

+255
+265

+175
+185

70

800
900

900
1000

+90

+34

+112

+56

+156

+100

+266
+276

+210
+220

+300
+310

+210
+220

90

1000
1120

1120
1250

+106

+40

+132

+66

+186

+120

+316
+326

+250
+260

+355
+365

+250
+260

105

1250
1400

1400
1600

+126

+48

+156

+78

+218

+140

+378
+408

+300
+330

+425
+455

+300
+330

125

1.c. FITS

Bore Fits

Shaft Fits

 

ISO Fits Used in Machine Manufacturing

 

NORMAL BORE

NORMAL SHAFT

FIT TYPE

APPLICATIONS

 

X8/h8, Z8/h9

Interference Fits

Gearwheel elements, cylindrical
pins, in transmission of big
rotational torques

H7/r6, H7/s6, H5/r4

S7/h6

For high failure forces,
gearwheel, flywheel and
wheel hubs, bronze beds
on cast hubs, (s6 is for big
diameters, r6 is for small
diameters)

H7/m6, H7/n6

 

Transition fits

Tightly joined parts that can
be removed with a great force
(cylindrical pins, thimbles)

H7/j6, H5 / j5

 

Parts engaged with flips
or powerful pushes, gearwheels
centering flanges, pulleys

H7/h6, H6/h6, H5/h4

H7/h6, H6/h6, H5/h4

Sliding parts, drilling thimbles,
gearwheel elements with
high sensitivity, centering
flanges

H8/h8, H8/h9

H8/h8, H8/h9

Slip joined elements,
rivets and pins with
centering functions

H10/h9, H11/h11

H10/h9, H11/h11

Rivets and pins with
low centering functions

H4/g3, H5/g5

 

Clearance fits

Dynamic air beds,
impermeable sleeve bearings

H6/g5

G6/h5

Quiet high sensitivity
low clearance
sleeve bearings

H7/g6

G7/h6

Low clearance fine precision
sensitive sleeve bearings
linear guide rails

 

G7/h8

Low clearance sleeve bearings

H7/f7, H6/f5

 

High stress journal
bearings. Sliding gearwheels,
Bearing bushes, sliding gears.

H8/f8

F8/h8

Average stress sleeve bearings,
easily sliding combinations

H8/e8

F8/h9, F9/h9

Low stress journal
bearings.

 

E9/h9, D10/h9

Sleeve bearing operating in
continuous hot environments,
wedges, axle bushes for farm machinery

H11/a11

D10/h11, D11/h11,D11/h9

Rivet and pin combinations
without centering function.

 

CD10/h9, C11/h11

Rough transmission shafts,
dispensable sleeve bearings


--
Devendra Singh

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