Sized 30 × 40 × 5 mm (inner × outer × width), the Oil Seal 30x40x5 NBR TC seals a 30 mm rotating shaft inside a 40 mm bore — a common size in electric motors, gearboxes, pumps and agricultural machinery.
Specifications
| Inner diameter (shaft) | 30 mm |
| Outer diameter (bore) | 40 mm |
| Width | 5 mm |
| Seal type | TC — double lip, rubber covered, garter spring |
| Material | NBR – Nitrile |
| Temperature range | -30 °C … +100 °C |
About the TC profile
Every TC seal combines three elements: a rubber-covered case that grips the bore, a spring-loaded sealing lip that follows shaft runout, and a dust lip that shields the main lip from contamination.
Material: NBR – Nitrile
NBR (Nitrile) is the standard compound for general industrial sealing. It handles mineral oils, greases and hydraulic fluids, which is why it is the default choice in gearboxes, electric motors and pumps. Keep it away from brake fluid, and store spare seals out of direct sunlight.
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
- Sold per piece — no minimum order, priced in US dollars.
- Prices exclude any import duties or taxes; if your customs authority charges them, they are the buyer’s responsibility.
- One flat shipping rate worldwide · tracking number by email.
- Not sure this is the right size? See how to measure an oil seal, or send us your dimensions — pre-sale size checks are free.
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