Construction of an Oil Seal
Nitrile rubber offers good durability for general use, while the flexibility of the spring behind the sealing lip keeps the oil seal firmly in place against the moving part.
Figure 6: Recommended housing bore chamfers (shouldered bore)
Want to learn more? Read “Oil Seals 101, Part 2”.
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Oil seal characteristics
Special seal types and their features
Seals perform much better and longer when they are continuously lubricated with an oil that has the correct viscosity for the application and that is compatible with the seal lip elastomer material. The consideration of seal incompatibility, particularly with certain additives and some synthetic lubricants, should not be ignored, but unfortunately very often is.

