Imported high-speed precision angular contact ball bearings are mainly used in high-speed rotation occasions with light load. The bearings require high precision, high speed, low temperature rise and low vibration and a certain service life. It is often used as the supporting parts of high-speed electric spindle to be installed in pairs. It is a key accessory for high-speed electric spindle of inner surface grinder. Main technical indicators: 　　 1. Bearing accuracy indicators: exceeding GB/307.1-94 P4 accuracy 2. High-speed performance indicators: dmN value 1.3~1.8x 106 /min　　 3. Service life (average): ＞1500 h　　 high-speed precision angular contact ball Bearing service life has a lot to do with installation. The following matters should be noted: 1. Bearing installation should be carried out in a dust-free and clean room. The bearing should be carefully selected and the bearing spacer should be ground to maintain the inner and outer ring spacers. Under the premise of equal height, the parallelism of the spacer should be controlled below 1um; 　　 2. The bearing should be cleaned before installation, the inner ring slopes upwards when cleaning, the hand feels flexible, no sense of stagnation, after drying, put in the specified amount of grease If it is oil mist lubrication, put a small amount of oil mist oil; 　　3. Special tools should be used to install the bearing, and the force should be uniform, and no beating is allowed; 　　4. Long-term storage should be regularly rust-proof.