Rotary Shaft Seals Manufacturers, Suppliers & Exporters In India. Rotary shaft seals, also known as radial shaft seals or lip seals, are components designed to seal the gap between a rotating shaft and its housing. These seals prevent the leakage of fluids (such as oil or grease) from the system and also protect against the entry of contaminants. Rotary shaft seals typically consist of a flexible sealing lip that makes contact with the rotating shaft. The lip provides a dynamic seal, allowing the shaft to rotate while maintaining an effective barrier against fluid leakage.