| The bearing steel balls we supply is applying international standard and also can by customer's specic needs. |
| Main Standards of Steel Balls: |
| International Standards： ISO3290-2002 |
| Chinese Standards: GB308-2002 |
| German Standards: DIN5401-11.1993 |
| American Standards: ANSI/AFBMA-10.1989 |
| |
|
| Technology Parameter of Heat Treatment: |
| Hardness:By reference of Chinese Standards GB/T308-2002 |
|
| diameter |
hardness |
|
|
|
| over |
to |
HRC |
|
|
|
| -- |
30 |
60--66 |
|
|
|
| 30 |
50 |
59--64 |
|
|
|
| 50 |
-- |
58--64 |
|
|
|
|
|
| Loads of Crushing: By reference of Chinese Standards JB/T1255-2001 ( KN) |
|
| dia. |
Loads |
dia. |
Loads |
dia. |
Loads |
| 3 |
4.8 |
13 |
87.22 |
26 |
333.2 |
| 3.175 |
5.39 |
13.4938 |
94.08 |
26.9875 |
357.7 |
| 3.9688 |
8.43 |
14 |
100.94 |
28 |
385.14 |
| 4 |
8.53 |
14.2875 |
104.86 |
28.575 |
396.9 |
| 4.5 |
10.78 |
15 |
115.64 |
30 |
439.04 |
| 4.7625 |
12.05 |
15.0812 |
116.62 |
30.1625 |
441 |
| 5 |
13.33 |
15.875 |
128.38 |
31.75 |
487.06 |
| 5.5562 |
16.27 |
16 |
131.32 |
32 |
494.9 |
| 5.9531 |
18.13 |
16.6688 |
142.1 |
33.3375 |
534.1 |
| 6 |
19.01 |
17 |
147 |
34 |
557.62 |
| 6.35 |
21.27 |
17.4625 |
154.84 |
34.925 |
582.13 |
| 6.7469 |
24 |
18 |
164.64 |
35 |
588 |
| 7 |
25.87 |
18.2562 |
168.56 |
36 |
617.4 |
| 7.1438 |
26.95 |
19 |
182.77 |
36.5125 |
632.1 |
| 7.9375 |
32.83 |
19.05 |
183.26 |
38 |
683.06 |
| 8 |
33.32 |
19.8438 |
198.94 |
38.1 |
689 |
| 8.7312 |
39.69 |
20 |
201.88 |
40 |
745.78 |
| 9 |
41.94 |
20.6375 |
214.62 |
41.275 |
798.7 |
| 9.5 |
46.84 |
21 |
241.03 |
42 |
823.2 |
| 9.525 |
47.04 |
22 |
241.03 |
44.45 |
911.4 |
| 10 |
51.94 |
22.225 |
246.96 |
45 |
931 |
| 10.3188 |
54.88 |
23 |
262.64 |
47.625 |
103.88 |
| 11 |
62.72 |
23.0188 |
257.74 |
48 |
1068.2 |
| 11.1125 |
63.7 |
23.8125 |
281.26 |
50 |
1156.4 |
| 11.5 |
68.51 |
24 |
287.14 |
50.8 |
1166.2 |
| 11.5094 |
68.6 |
25 |
309.68 |
|
|
| 11.9062 |
73.5 |
25.4 |
318.5 |
|
|
| 12 |
74.48 |
|
|
|
|
| 12.3031 |
78.4 |
|
|
|
|
| 12.7 |
83.3 |
|
|
|
|
