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302 Stainless Steel Balls

302 Stainless Steel Balls

Chemical composition of 302 Stainless Steel Balls

C

0.15% max.

Mn

2% max.

P

0.045% max.

S

0.030% max.

Si

1.00% max.

Cr

17.00 - 19.00%

Ni

8% - 10%

Nitrogen

0.10% max.

Copper (type HQ)

------

Physical capability of 302 stainless steel balls

Tensile strength

100,000 to 180,000 psi

Yield strength

50,000 to 150,000 psi

Tensibility

55 to 60%

Modulus of Elasticity

29,000,000 psi

Density

0.286 lbs/cubic inch


Applications：302 stainless steel ball is widely used in automotive fittings, avigation, hardware tools, chemical industry. mostly as follows: craftwork, bearings, chain wheel, iatrical instruments and so on.

Speciality：302 stainless steel ball is close to 304 stainless steel ball, but its hardness is higher than 304, HRC≤28. It has good antirust and anticorrosive capability.

Production Grade: G10 - G1000

Applicable Standard: ISO3290, GB308, DIN5401, ABMA, JIS
Range of Sizes: 1.5875mm（1/16 inch）- 38.1000mm（1 1/2 inch），specifications as follow:

Diameter

kg per
1000 pcs

No. of balls
per kg

Diameter

kg per
1000 pcs

No. of balls
per kg

Inch

mm

 

 

Inch

mm

 

 

1/16

-

-

1.5875

1.7500

2.0000

0.016

0.022

0.033

62350

45871

30700

-

31/64
1/2
17/32

12.0000
12.3031
12.7000
13.4938

7.040
7.600
8.350
10.000

142
132
120
100

3/32

-

-

2.3812

2.5000

3.0000

0.055

0.0637

0.110

18182

15698

9091

-
9/16
19/32

14.0000
14.2875
15.0812

11.18
11.90
14.00

89.00
84.00
71.40

1/8
-
5/32

3.1750
3.5000
3.9688

0.131
0.175
0.255

7634
5717
3922

5/8
-
21/32

15.8750
16.0000
16.6688

16.30
16.69
18.90

61.30
59.90
52.90

-
3/16
-

4.0000
4.7625
5.0000

0.261
0.441
0.510

3831
2268
1961

-
11/16
23/32

17.0000
17.4625
18.2562

20.02
21.70
24.80

50.00
46.10
40.30

13/64
7/32
15/64

5.1594
5.5562
5.9531

0.560
0.699
0.860

1786
1431
1163

-
3/4
25/32

19.0000
19.0500
19.8438

27.96
28.20
31.90

35.77
35.50
31.40

-
1/4
-

6.0000
6.3500
6.5000

0.881
1.040
1.119

1136
962
894

13/16
-
27/32

20.6375
21.0000
21.4313

35.80
37.75
40.10

27.90
26.49
24.90

17/64
9/32 
5/16

6.7469
7.1438
7.9375

1.250
1.490
2.040

800
671
490

7/8
-
29/32

22.2250
23.0000
23.0188

44.80
49.59
49.80

22.30
20.17
20.10

-
-
11/32

8.0000
8.5000
8.7312

2.090
2.500
2.710

478
400
369

15/16
-
31/32

23.8125
24.0000
24.6063

55.10
56.34
60.80

18.20
17.75
16.50

-
3/8
-

9.0000
9.5250
10.0000

2.970
3.520
4.080

337
284
245

-
1
1 1/16

25.0000
25.4000
26.9875

63.68
66.80
88.50

15.70
15.00
11.30

13/32
-
7/16

10.3188
11.0000
11.1125

4.480
5.420
5.600

223
185
179

1 1/8
1 3/16
1 1/4

28.5750
30.1625
31.7500

104.50
127.80
143.80

9.56
7.83
6.96

-
29/64
15/32

11.5000
11.5094
11.9062

6.220
6.220
6.880

161
161
145

1 5/16
1 3/8
1 7/16
1 1/2

33.3375
34.9250
36.5125
38.1000

164.30
191.70
230.00
287.50

6.09
5.22
4.35
3.48 

Ball Materials as follow:

Material

Code

Chemical composition（%）

C

Si

Mn

P

S

Cr

Ni

Mo

Carbon steel

Q195

≤0.12

≤0.30

0.25-0.50

≤0.035

≤0.040

-

-

-

Q215

0.09-0.15

≤0.30

0.25-0.60

≤0.045

≤0.045

-

-

-

Q235

0.12-0.20

≤0.30

0.30-0.70

≤0.045

≤0.045

-

-

-

Q275

0.14-0.22

≤0.32

0.40-1.00

≤0.045

≤0.045

-

-

-

High quality carbon steel

10

0.08-0.13

-

0.30-0.60

≤0.040

≤0.050

-

-

-

15

0.13-0.18

-

0.30-0.60

≤0.040

≤0.050

-

-

-

45

0.42-0.48

0.15-0.35

0.60-0.90

≤0.030

≤0.035

-

-

-

85

0.80-0.90

0.35-0.45

0.60-0.90

≤0.050

≤0.050

-

-

-

Bearing chrome steel

GCr15

0.95-1.10

0.15-0.35

≤0.50

≤0.025

≤0.025

1.30-1.60

-

-

Cold Heading Carbon Steel

SWRCH22A

0.18-0.20

≤0.10

0.70-1.00

≤0.035

≤0.035

Alt ≥0.020

Stainless steel

201

≤0.15

≤1.00

5.5-7.5

≤0.045

≤0.030

16.0-18.0

3.50-5.50

-

302

≤0.15

≤1.00

≤2.00

≤0.045

≤0.030

17.0-19.0

8.00-10.0

-

304

≤0.08

≤1.00

≤2.00

≤0.045

≤0.030

17.0-19.0

9.00-10.0

-

316

≤0.08

≤1.00

≤2.00

≤0.045

≤0.030

16.0-18.0

10.0-14.0

2.0-3.0

420

0.26-0.35

≤1.00

≤1.00

≤0.040

≤0.030

12.0-14.0

-

-

440C

0.95-1.20

≤1.00

≤1.00

≤0.040

≤0.030

16.0-18.0

-

≤0.075

International steel grade comparison table

C.

STD.

Chrome

Steel

Carbon Steel

Stainless Steel

CN

GB

GCr15

10

15

45

85

1Cr17Mn6Ni5N

1Cr18Ni9

0Cr18Ni 9

0Cr17Ni12Mo2

3Cr13

9Cr18

US

AISI

52100

1010

1015

1045

1085

201

302

304

316

420

440C

JP

JIS

SUJ2

S10C

S15C

S45C

SUP3

SUS201

SUS302

SUS304

SUS316

SUS420J2

SUS440C

EU GM

EN

DIN

100Cr6

CK10

CK15

CK45

X12CrMnNi17-7-5

X10CrNi18-8

X5CrNi18-10

X5CrNiMo17-12-2

X30Cr13

X105CrMo17

1.3505

1.1141

1.4372

1.4310

1.4301

1.4401

1.4028

1.4125

Steel ball tolerance classes and technical requirements

ISO 3290:2001 (E) & GB/T 308-2002

Form and surface roughness tolerance

Grade

Nominal diameter deviation △DWML

Variation of ball diameter

VDWS

Deviation from spherical form

△Sph

Variation of ball lot diameter VDWL

Surface roughness

Ra

Maximum μm

G10

-

0.25

0.25

0.50

0.020

G16

-

0.40

0.40

0.80

0.025

G20

-

0.50

0.50

1.00

0.032

G24

-

0.60

0.60

1.20

0.040

G28

-

0.70

0.70

1.40

0.050

G40

-

1

1

2

0.060

G60

-

1.5

1.5

3

0.080

G100

±12.5

2.5

2.5

5

0.100

G200

±25

5

5

10

0.150

G500

±50

13

13

25

-

G1000

±125

25

25

50

-

ISO 3290:2001 (E) & GB/T 308-2002

Sorting tolerances and gauges

Grade

Variation of ball lot diameter

VDWL max.

Gauge Interval

Preferred gauges

Subgauge Interval

Subgauges

μm

G10

0.5

1

-9, ... -1,  0,  +1, ... +9

0.2

-0.4, -0.2, 0, +0.2, +0.4

G16

0.8

2

-10, ... -2,  0,  +2, ... +10

0.4

-0.8, -0.4, 0, +0.4, +0.8

G20

1

2

-10, ... -2,  0,  +2, ... +10

0.4

-0.8, -0.4, 0, +0.4, +0.8

G24

1.2

2

-12, ... -2,  0,  +2, ... +12

0.4

-0.8, -0.4, 0, +0.4, +0.8

G28

1.4

2

-12, ... -2,  0,  +2, ... +12

0.4

-0.8, -0.4, 0, +0.4, +0.8

G40

2

4

-16, ... -4,  0,  +4, ... +16

0.8

-1.6, -0.8, 0, +0.8, +1.6

G60

3

6

-18, ... -6,  0,  +6, ... +18

1.2

-2.4, -1.2, 0, +1.2, +2.4

G100

5

10

-40, ... -10,  0,  +10, ... +40

2

-4, -2, 0, +2, +4

G200

10

15

-60, ... -15,  0,  +15, ... +60

3

-6, -3, 0, +3, +6

ANSI/AFBMA-STD 10-2001-USA

Form and surface roughness tolerance

Grade

Nominal diameter deviation

△DWML

Variation of ball diameter

VDWS

Deviation from spherical form

△Sph

Variation of ball lot diameter

VDWL

Surface roughness

Ra

μm

μm

inch

μm

μm

μm

G10

±2.5

0.25

0.000010

0.25

0.500

0.025

G16

±2.5

0.40

0.000016

0.40

0.800

0.025

G24

±2.5

0.60

0.000024

0.60

1.200

0.050

G48

±5

1.20

0.000048

1.20

2.400

0.080

G100

±12.5

2.50

0.000100

2.50

5

0.125

G200

±25

5

0.000200

5

10

0.200

G500

±50

13

0.000500

13

25

-

G1000

±125

25

0.001000

25

50

-



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