Rotary shaft seal types
Cassette seals
A cassette seal is a two-part seal that carries its own counterface, so the lip never runs on the shaft and shaft finish, hardness and wear stop mattering to it. Send the part number or drawing and we quote it.
- Family
- Non-contacting and unitized seals
- Designation
- cassette seal
- Dust lip
- Yes
- Garter spring
- Yes
- Outside diameter
- Metal
- Case
- two-part, with its own counterface
When to use it
Dirty, wet, heavy duty where the shaft cannot be relied on as a counterface. The seal brings its own counterface, so shaft finish, shaft hardness and shaft wear stop being the seal's problem. That is the whole point of it, and it is why it suits off-highway and agricultural machines.
When another type fits better
- TC: Sealing lip and dust lip, rubber-covered outside diameter, when the shaft is in good condition and the duty is not severe.
Sources: Freudenberg Technical Manual for Simmerring® seals and rotary seals, read 2026-09-16.
Simmerring is a trademark of Carl Freudenberg KG. The maker designations on this page are the makers' own. No affiliation or endorsement is implied.
Related pages
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the shaft, bore and width, or the old seal's markings
The three dimensions or the code printed on the old seal, the speed, any pressure, the fluid and the quantity. A Conquest representative replies with the quote.
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