Luoyang Mingzhen Bearing Steel Ball Co.,Ltd

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Techinical Specification
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Form and surface roughness tolerances

Grade

Variation of ball
diameter
VDws(≤)
(μm)

Deviation from
spherical form
∆RSw(≤)
(μm)

Surface roughness
Ra(≤)
(μm)

Mean diameter of
ball lot
VDwL(≤)
(μm)

G3

0.08

0.08

0.01

0.13

G5

0.13

0.13

0.014

0.25

G10

0.25

0.25

0.02

0.5

G16

0.4

0.4

0.025

0.8

G20

0.5

0.5

0.032

1

G24

0.6

0.6

0.04

1.2

G28

0.7

0.7

0.05

1.4

G40

1

1

0.06

2

G60

1.5

1.5

0.08

3

G100

2.5

2.5

0.1

5

G200

5

5

0.15

10

G500

13

13

*

25

G1000

25

25

*

50


Ball hardness

Nominal ball diameter
Dw / mm

Chrome steel ball

Carbon steel ball

Stainless steel ball

>

Hardness (HRC)

Hardness (HRC)

Hardness (HRC)

-

30

61 - 66

≥60

*

30

50

60 - 65

50

-

58 - 64


Preferred nominal ball diameters

Nominal ball
diameter

Dw
mm

Corresponding
inch size

(reference)
in

Nominal ball
diameter

Dw
mm

Corresponding
inch size

(reference)
in

Nominal ball
diameter

Dw
mm

Corresponding
inch size

(reference)
in

0.3

 

9.525

3/8

30.1625

1 3/16

0.39688

1/64

9.92188

25/64

31.75

1 1/4

0.4

 

10

 

32

 

0.5

 

10.31875

13/32

33

 

0.508

0.02

10.5

 

33.3375

1 5/16

0.6

 

11

 

34

 

0.635

0.025

11.1125

7/16

34.925

1 3/8

0.68

 

11.5

 

35

 

0.7

 

11.50938

29/64

36

 

0.79375

1/32

11.90625

15/32

36.5125

1 7/16

0.8

 

12

 

38

 

1

 

12.30312

31/64

38.1

1 1/2

1.19062

3/64

12.5

 

39.6875

1 9/16

1.2

 

12.7

1/2

40

 

1.5

 

13

 

41.275

1 5/8

1.5875

1/16

13.49375

17/32

42.8625

1 11/16

1.98438

5/64

14

 

44.45

1 3/4

2

 

14.2875

9/16

45

 

2.38125

3/32

15

 

46.0375

1 13/16

2.5

 

15.08125

19/32

47.625

1 7/8

2.77812

7/64

15.875

5/8

49.2125

1 15/16

3

 

16

 

50

 

3.175

1/8

16.66875

21/32

50.8

2

3.5

 

17

 

53.975

2 1/8

3.57188

9/64

17.4625

11/16

55

 

3.96875

5/32

18

 

57.15

2 1/4

4

 

18.25625

23/32

60

 

4.36562

11/64

19

 

60.325

2 3/8

4.5

 

19.05

3/4

63.5

2 1/2

4.7625

3/16

19.84375

25/32

65

 

5

 

20

 

66.675

2 5/8

5.15938

13/64

20.5

 

69.85

2 3/4

5.5

 

20.6375

13/16

70

 

5.55625

7/32

21

 

73.025

2 7/8

5.95312

15/64

21.43125

27/32

75

 

6

 

22

 

76.2

3

6.35

1/4

22.225

7/8

79.375

3 1/8

6.5

 

22.5

 

80

 

6.74688

17/64

23

 

82.55

3 1/4

7

 

23.01875

29/32

85

 

7.14375

9/32

23.8125

15/16

85.725

3 3/8

7.5

 

24

 

88.9

3 1/2

7.54062

19/64

24.60625

31/32

90

 

7.9375

5/16

25

 

92.075

3 5/8

8

 

25.4

1

95

 

8.33438

21/64

26

 

95.25

3 3/4

8.5

 

26.19375

1 1/32

98.425

3 7/8

8.73125

11/32

26.9875

1 1/16

100

 

9

 

28

 

101.6

4

9.12812

23/64

28.575

1 1/8

104.775

4 1/8

9.5

 

30

 

 

 

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Address: Liupo village, Mangling Town, Yanshi, Luoyang, Henan, China.
Tel: +86 (0)379 6439 0720
Fax: +86 (0)379 6439 0720
E-mail:info@mzsteelball.com
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