National 4990 Oil Seal — SKF/CR Equivalent
| SKF / CR Part No. | Catalog Source |
|---|---|
| 20421 | Verified in both SKF 457012 & National 430i catalogs |
| 20427 | Verified in both SKF 457012 & National 430i catalogs |
| 20428 | Verified in both SKF 457012 & National 430i catalogs |
| 20455 | Verified in both SKF 457012 & National 430i catalogs |
| VKBA1928 | Verified in both SKF 457012 & National 430i catalogs |
| VKBA739 | Verified in both SKF 457012 & National 430i catalogs |
| VKBA949 | Verified in both SKF 457012 & National 430i catalogs |
| Dimension | Metric (mm) | Inch |
|---|---|---|
| Shaft diameter | 52 | 2.047 |
| Housing bore | 68 | 2.677 |
| Seal O.D. | 68.28 | 2.688 |
| Width | 7 | 0.276 |
Size 52 × 68 × 7 mm (2.047 × 2.677 × 0.276 in), lip material code S — from the National 430i catalog. Always confirm shaft diameter, bore diameter and width against your application before ordering.
Verify dimensions before ordering. Interchange numbers mean the same shaft/bore application, but lip material, spring design or width can differ between brands. Metric sizes can be checked on our oil seal size chart.
Need this seal? Email sales@sealstocks.com with part number National 4990 for stock & pricing. Factory direct, global shipping.