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End Caps

End Caps: Secure Closure for Various Applications

End caps play a vital role in providing a secure closure for bores, bearings, and shaft feedthroughs. These valves are constructed with steel and feature vulcanized rubber on the outside. End caps are commonly used as end seals for shaft passages in motor gearboxes, bridges, and other gear mechanisms.

Applications of End Caps

End caps find application in various industries and settings, including:

  • Transmissions: End caps are utilized to ensure a reliable seal in transmission systems, preventing leaks and maintaining proper lubrication.

  • Bearing block sealing: End caps help seal bearing blocks, protecting them from contaminants and ensuring smooth operation.

  • Split housings: When using split housings, end caps are essential for sealing the housing halves and preventing leakage.

  • Light metal housings: End caps provide effective sealing in lightweight metal housings, maintaining the integrity of the enclosure.

  • Sealing of thin flowing or gaseous media: The versatility of end caps extends to sealing applications involving thin or gaseous media, ensuring a tight and secure seal.

Installation Considerations

Proper installation is crucial for achieving a functional seal with end caps. Using a hydraulic or mechanical press-in device is the recommended method for pressing the end cap into the housing bore. The pressing force should act tightly on the outer diameter of the end cap to ensure a secure fit. To minimize rebound or misalignment, it is necessary to hold the press-in device in the final position for a specific period. The design of the mounting hole should adhere to the guidelines specified in DIN 3760 for radial shaft seal rings. Additionally, the bore diameter d2 should comply with the ISO tolerance zone H8 according to DIN ISO 286.

Advantages of End Caps

End caps offer several advantages, including:

  • Use of highly resistant NBR (nitrile butadiene rubber) and FKM (fluoroelastomer) materials, ensuring durability and reliable sealing performance.

  • Wide temperature range: End caps can withstand a broad range of temperatures, making them suitable for diverse operating conditions.

  • Secure closure of bores: End caps provide a tight and secure closure for bores, preventing leakage and protecting the internal components.

  • Stiffening ring made of unalloyed steel: The inclusion of a stiffening ring, manufactured in accordance with DIN EN 10139, enhances the structural integrity of the end cap.

  • Versatile design options: End caps are available in three different formats, including an elastomer outer casing, half-shoulder design, or an elastomer grooved outer casing, providing flexibility for various sealing requirements.

  • Customization: Special profiles can be created to meet specific end cap requirements, ensuring a tailored solution for unique applications.

In summary, end caps offer a reliable and secure closure solution for bores, bearings, and shaft feedthroughs. With their use of high-quality materials, wide temperature range, and versatile design options, end caps provide effective sealing in various industries and applications. By choosing end caps, you can ensure a tight seal, prevent leaks, and protect critical components, ultimately enhancing the performance and longevity of your equipment.


If you would like more information about End Caps, feel free to contact us.

Maybe interested in our high-quality Freudenberg End Caps? Take a look at our Freudenberg Sealing Technologies website!