A seal lip can only seal on a shaft that is hard, smooth and round enough, in a housing bore that holds it square. Check these before fitting.
Installation requirements
- Shaft hardness: 45 HRC or higher
- Shaft roughness: Ra 0.2–0.8 µm, plunge ground
- Shaft tolerance: h9
- Housing roughness: Ra 1.6–3.2 µm
- Housing tolerance: H8
- Lead-in chamfer: 15°–30°
