External shaft seals for rotating housings
External shaft seals, also known as external-sealing shaft seals, are used for sealing applications where the shaft remains static and the housing rotates. This distinguishes them from classic radial shaft seals, which typically seal a rotating shaft against a stationary housing.
INNSEALS supplies external shaft seals in various elastomer materials such as NBR, FKM, VMQ, EPDM, and HNBR. Special materials are available upon request.
The right external shaft seal for your application
We provide personal consulting
Send us your inquiry with dimensions, material, medium, temperature range, pressure, and operating conditions. Our team will review the right solution for your application.
External shaft seals from INNSEALS
External shaft seals are specialized rotary seals for applications with reversed motion. While the shaft usually rotates in standard shaft seals, in external shaft seals, the shaft remains static and the housing performs the rotational movement.
This type of seal is used where external sealing is required and the design situation does not allow for a classic internal shaft seal. Crucial for functionality are the correct design, the appropriate material, and a configuration that matches the movement of the housing.
Function of external shaft seals
External shaft seals seal outwards and are designed for applications with a static shaft and rotating housing. The sealing lip is designed to match the direction of movement and the installation situation.
The exact design depends on the application. Key factors include the installation space, medium, temperature, speed, friction, and the surface quality of the mating surface.
Key functional features
- suitable for external sealing applications
- designed for static shafts and rotating housings
- sealing for reversed motion
- suitable for special rotary applications
- material selection based on medium and temperature
Application
- external sealing applications
- rotating housings
- static shafts
- special rotary seals
- mechanical and plant engineering
- Drive technology
- custom design solutions
Materials
- NBR
- FKM
- VMQ
- EPDM
- HNBR
- Specialty materials available on request
Difference from classic radial shaft seals
Classic radial shaft seals are typically used to seal rotating shafts. In contrast, external shaft seals are intended for applications where the shaft is stationary and the housing rotates.
This design feature requires an appropriate configuration of the sealing lip, material, and mating surface. INNSEALS assists you in determining the suitable design for your application.
Variants
Shaft seal R93
Shaft seal R94
Shaft seal R95
Shaft seal RC2
Your FAQs answered
Frequently asked questions:
An external shaft seal is used when the seal is mounted on the housing from the outside. This is particularly useful when subsequent sealing or easy replacement is required.
You benefit from simpler installation and removal, as the seal ring is accessible from the outside. This saves time during maintenance and reduces machine downtime.
Yes, this design is ideal for exactly that purpose. It can also be used on existing systems without major modifications to the housing.
Yes, with correct selection and installation they offer equally reliable sealing. It is important that the installation situation and operating conditions are taken into account.
Ensure that the sealing surfaces are clean and undamaged. Even pressing is also important to achieve optimal sealing effect and long service life.
