Hebei Hankai defender rear hub seal

A rotary shaft seal, also known as a lip seal or radial seal, is a device that creates a barrier between two environments the area where the rotating shaft operates and the external atmosphere. In high-pressure applications, these seals are engineered to withstand significant operational pressures, often exceeding several thousand psi. They are utilized in applications such as hydraulic pumps, turbines, and engines, where preventing fluid loss is critical.

A dust seal, also known as a dust cover or dust boot, is designed primarily to protect components from dust, dirt, and other contaminants. Dust seals are commonly used in applications where exposure to external particles is a concern. They are often made from materials like rubber, polyurethane, or plastic, which provide flexibility while preventing debris from entering sensitive areas.