# Stainless Steel - ISO Dimensional Tolerances for Bar

Nominal Bar Size (mm)

Tolerance Number

01

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

up to 3

0.3

0.5

0.8

1.2

2

3

4

6

10

14

25

40

60

100

140

250

400

600

over 3 to 6

0.4

0.6

1

1.5

2.5

4

5

8

12

18

30

48

75

120

180

300

480

750

over 6 to10

0.4

0.6

1

1.5

2.5

4

6

9

15

22

36

58

90

150

220

360

580

900

over 10 to 18

0.5

0.8

1.2

2

3

5

8

11

18

27

43

70

110

180

270

430

700

1100

over 18 to 30

0.6

1

1.5

2.5

4

6

9

13

21

33

52

84

130

210

330

520

840

1300

over 30 to 50

0.6

1

1.5

2.5

4

7

11

16

25

39

62

100

160

250

390

620

1000

1600

over 50 to 80

0.8

1.2

2

3

5

8

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13

19

30

46

74

120

190

300

460

740

1200

1900

over 80 to 120

1

1.5

2.5

4

6

10

15

22

35

54

87

140

220

350

540

870

1400

2200

over 120 to 180

1.2

2

3.5

5

8

12

18

25

40

63

100

160

250

400

630

1000

1600

2500

over 180 to 250

2

3

4.5

7

10

14

20

29

46

72

115

185

290

460

720

1150

1850

2900

over 250 to 315

2.5

4

6

8

12

16

23

32

52

81

130

210

320

520

810

1300

2100

3200

over 315 to 400

3

5

7

9

13

18

25

36

57

89

140

230

360

570

890

1400

2300

3600

over 400 to 500

4

6

8

10

15

20

27

40

63

97

155

250

400

630

970

1550

2500

4

Tolerance values given in microns = x0.001 mm

H = all minus. For example, 25.40mm diameter bar to h9 = + Nil, -0.052mm

j = equal. For example, 38.10mm hexagonal bar to j10 = + 0.050mm,-0.050mm

k = all plus. For example, 160mm hot rolled bar to k14 = + 1.000mm, - Nil

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