The main difference between graphite bronze bushings and oil groove bronze bushings is their structure and lubrication method:

Graphite bronze bushings:

Material: This type of bushing contains graphite powder inside, graphite as solid lubricant can reduce friction.
Lubrication method: Graphite bronze bushings do not depend on external lubricants. Graphite provides solid lubrication, allowing it to operate without oil, and is suitable for low speed and high temperature environments.
Characteristics: Excellent wear resistance and self-lubrication, suitable for dry friction environments.

Oil groove bronze bushings:

Material: oil groove bronze bushings are usually made of copper alloy and designed with oil groove inside.
Lubrication: The oil groove design can store lubricating oil, so that the copper sleeve can be continuously lubricated during operation, suitable for environments that require a large amount of lubrication.
Characteristics: Oil-filled bronze bushings are suitable for high load and high speed operating conditions as they provide a continuous supply of lubricant, reducing wear and increasing service life.