Heavy Duty Radial Shaft Seals – The Simmerring®
The original Simmerring® from Freudenberg for the aftermarket.
Precision is crucial when sealing rotating shafts in engines and transmissions. The Simmerring® from Freudenberg is available exclusively from Corteco in the independent aftermarket and offers maximum reliability and original equipment (OE) quality. Designed for heavy-duty use in commercial vehicles, trucks, and construction machinery, the Simmerring® effectively prevents fluid leakage and protects against dirt. Thanks to innovative materials and manufacturing technologies, the Simmerring® reduces friction and fuel consumption while ensuring a long service life. Corteco’s high-quality products enable customized solutions that simplify repairs and minimize claims.
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Our Oil Seal Range

CASCO SEALS
Modern heavy-duty vehicles require solutions that seal effectively and reduce operating costs. CASCO seals, which are based on Freudenberg’s LESS (Low Emission Sealing Solutions) technology, meet this requirement precisely. Compared to conventional solutions, they reduce friction by up to 80%, minimise heat build-up and extend the service life of the sealing lip. The result is less wear, improved fuel efficiency, and significantly reduced CO₂ emissions. This means sustainable cost advantages for fleet operators and a durable solution that reduces downtime for mechanics.

CASSETTE SEALS
In construction and agricultural machinery, as well as in heavy commercial vehicles, seals are exposed to extreme stress from dust, moisture and dirt. Corteco’s cassette seals combine the proven Simmerring® technology from Freudenberg with an additional sealing sleeve to offer maximum protection for shafts, engines, gearboxes and axles. They effectively prevent the ingress of dirt and water, ensuring a long service life even under harsh conditions. Sophisticated elastomers eliminate the need for a spring and reduce friction, even at high temperatures.
The range includes four variants:
S1, S2 and S3 offer increasing levels of protection against contamination, with S3 providing the highest level.
S4 variant has been specially developed for use in construction and agriculture. This is Freudenberg Sealing Technologies’ most advanced design, suitable for the toughest conditions.

COMBI SEAL option
Combi seals are used where maximum sealing performance is required. They combine a Simmerring® with a polyurethane scraper, which enables axial and rotary movement whilst protecting against contamination. This makes them perfect for applications where components must function reliably under extreme conditions.
Corteco guarantees that all Combi Seals comply exactly with OE specifications, thereby ensuring the operational safety of your vehicles.
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Discover Corteco’s convenient online services! Findyourseal.com simplifies your search for oil seals, while ecatcorteco.com offers a comprehensive catalog of automotive spare parts. Optimize your parts procurement process and find the perfect components quickly and easily with Corteco’s online platforms.




