▏Bearing Material
☉High carbon chromium bearing steel is the best material for bearing. It features high hardness, strong rolling fatigue resistance, abrasion resistance and stable sizes.
☉Chemical compositions of GCr15 (SAE52100) are shown on following table.
Chemical Composition % | C 0.95~1.05 | Cr 1.40~1.65 | Si 0.15~0.35 | Mn 0.25~0.45 | P
| S
|
Chemical Composition % | Ni
| Cu
| Mo
| Sn
| As
| Ti
|
Chemical Composition % | Sb
| Pb
| O
| Ai
| Ca
|
☉Stainless steel bearing parts material table:
Part Name | INNER RING | OUTER RING | BALL | CAGE | SHIELD | SEAL |
Material No | AISI440B (9Cr18Mo) | AISI440B (9Cr18Mo) | AISI440B (9Cr18Mo) | AISI304 | AISI304(302) | NBR |
AISI440C (9Cr18) | AISI440C (9Cr18) | AISI440C (9Cr18) | AISI304 | AISI304(302) | NBR |
☉The Chemical Composition of different stainless steel number.
Stainless steel No | C% | Cr% | Si% | Mn% | S% | P% | Mo% | Ni% |
AISI440B | 0.90~1.00 | 17~19 |
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|
|
| ||
AISI440C | 0.95~1.10 | 16~18 |
|
|
|
| 0.4~0.7 | |
AISI304 |
| 17~19 |
|
|
|
| 8~11 |
▏Tolerance
Bearing tolerance refers to the size accuracy and running accuracy. The different international standard accuracy as below:
Standard code | Precision class | ||||
CHINA GB | 0 | 6 | 5 | 4 | 2 |
ISO | 0 | 6 | 5 | 4 | 2 |
ANSI | ABEC-1 | ABEC-3 | ABEC-5 | ABEC-7 | ABEC-9 |
SKF | P0 | P6 | P5 | P4 | P2 |
DIN | P0 | P6 | P5 | P4 | P2 |
JIS | 0 | 6 | 5 | 4 | 2 |