| Bearing no. | 638ZZ |
|---|
| Bore diameter | d | 8 mm0.315 inch |
|---|
| Outer diameter | D | 28 mm1.1024 inch |
|---|
| Inner ring width | B | 9 mm0.3543 inch |
|---|
| Outer ring width | C | 9 mm0.3543 inch |
|---|
| Inner ring chamfer dimension | rsi min | 0.3 mm0.0118 inch |
|---|
| Outer ring chamfer dimension | rse min | 0.3 mm0.0118 inch |
|---|
| Basic dynamic load rating | Cr | 4580 N |
|---|
| Basic static load rating | Cor | 1970 N |
|---|
| Limiting speed | Grease | 28000 min-1 |
|---|
| Oil | 33000 min-1 |
|---|
| Abutment and fillet dimensions | da min | 10 mm0.3937 inch |
|---|
| da max | 13.8 mm0.5433 inch |
|---|
| Da min | 22.5 mm0.8858 inch |
|---|
| Da max | 26 mm1.0236 inch |
|---|
| rasi max | 0.3 mm0.0118 inch |
|---|
| rase max | 0.3 mm0.0118 inch |
|---|
| Ball size × quantity | 4.762 mm0.1875 inch × 7 |
|---|
| Mass (reference) | 28.3 g |
|---|
The above values are subject to change without notice for the improvement of products or other purposes. We have prepared this table with sufficient care, and we cannot be held responsible for any damage caused by possible errors or omissions.
