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SUJ2 Ball
Feature
High precision、Fune finished surface、Long endurability、High liability、Stable quality
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1.TPI ball’s-features

2.Standards For Geometry and Surface of Chrome Steel Balls

Grade

Applicable range of ball size

form and roughness

Grade

mm

Sphericity
(Max)μm

Ball dia. variation
(Max) μm

Lot dia. variation
(Max) μm

Surface roughness
(Max) μmRa

1

0.5~2.0mm

0.03

0.03

0.05

0.0025

2

0.5~3.5mm

0.05

0.05

0.10

0.005

3

0.3~12mm

0.08

0.08

0.13

0.012

5

0.3~12mm

0.13

0.13

0.25

0.02

10

0.3~25mm

0.25

0.25

0.5

0.025

16

0.3~25mm

0.4

0.4

0.8

0.032

20

0.3~38mm

0.5

0.5

1

0.04

28

0.3~38mm

0.7

0.7

1.4

0.05

40

0.3~50mm

1

1

2

0.08

60

0.3~65mm

1.5

1.5

3

0.095

100

0.3~65mm

2.5

2.5

5

0.125

200

0.3~65mm

5

5

10

0.2

 

3.Material Hardness and Crushing Load

Ball size

 

Nominal ball dia.
(mm)
 

 

Hardness

(HRc)

Crushing load(Kgf)
85.9Dw 1.773(min)

1/8

3.175

0.5mm~3.0mm HV772~900
(HRc63~67)
1/8
~ 1 1/8
HRc62~67
1 3/16
~ 4 1/2
HRc61~67

700

3.5

3.500

800

4

4.000

1000

3/16

4.763

1400

7/32

5.556

1800

1/4

6.350

2300

9/32

7.144

2800

5/16

7.938

3400

3/8

9.525

4700

7/16

11.112

6100

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