National 221040 Oil Seal — SKF/CR Equivalent
| SKF / CR Part No. | Catalog Source |
|---|---|
| 3940 | Listed in the National 430i catalog |
| Dimension | Metric (mm) | Inch |
|---|---|---|
| Shaft diameter | 10 | 0.394 |
| Housing bore | 19 | 0.748 |
| Seal O.D. | 19.2 | 0.756 |
| Width | 7 | 0.276 |
Size 10 × 19 × 7 mm (0.394 × 0.748 × 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 221040 for stock & pricing. Factory direct, global shipping.