Engineered as a direct replacement, the Oil Seal 42x78x12 NBR TC (42x78x12 mm) seals 42 mm shafts against dust and moisture from the moment it seats in the 78 mm bore — common in workshop motors, helical gearboxes, vane pumps and tractor attachments.
Technical specifications
| Inner diameter (shaft) | 42 mm |
| Outer diameter (bore) | 78 mm |
| Width | 12 mm |
| Seal type | TC — double lip, rubber covered, garter spring |
| Material | NBR – Nitrile |
| Temperature range | -30 °C … +100 °C |
Why the TC profile is so widely used
Three features define the TC type: the rubber outer case that fills small bore imperfections, the garter-spring-loaded lip that maintains contact under runout, and the auxiliary lip that acts as a dirt barrier.
Material: NBR – Nitrile
The compound is NBR nitrile, selected for oil-and-grease compatibility across motors, reducers and pumps. Note the limits: brake fluid degrades nitrile, and sunlight ages stored rubber — so store spares dark and dry.
If your shaft measures a few tenths of a millimetre under the nominal size, that is normal — the sealing lip is designed with interference for exactly that.
Ordering & delivery
- Each listing is for one seal — no MOQ, all prices in US dollars.
- Import duties or taxes, if levied by your customs, are paid by the buyer and are not included in the price.
- Worldwide shipping at a single flat rate, with a tracking number emailed to you.
- To double-check the size, read how to measure an oil seal or contact us with your dimensions — size checks before purchase are free.
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