The bearing is a precision mechanical part. From the factory to the long-term circulation. In order to prevent the bearing from rusting during transportation or storage under various environmental conditions, it must be rust-proofed. According to the national GB/TS597 standard. The rust prevention period of the bearing is half a year. Generally, the rust-proof period of the bearing is one year, and the rust-proof period of the bushing with higher requirements for use is two years. Bearings cannot be used during the rust-proof period for various reasons. When the bearing rust prevention period is reached, the original rust inhibitor should be removed.