Wear Protection: It can be used as a sacrificial, replaceable sleeve inserted onto the shaft itself. The sealing lip (from a Nitrile or Viton seal) runs on the surface of the metal bush rather than the expensive main shaft, protecting the shaft from wear grooves.

Sealing System Component: Specialized bushing seals or floating ring seals are metal components that function as non-contact (or minimal-contact) seals. They limit leakage by creating a very small, controlled clearance gap (flow resistance) between the bush and the shaft, which is ideal for high-speed, high-pressure gas or fluid applications (e.g., in turbines or compressors) where conventional lip seals would generate excessive heat.