High-speed precision angular contact ball bearings are mainly used in high-speed rotating occasions with light loads. They 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/307.1-94P4 accuracy 2. High-speed performance indicators: dmN value 1.3~1.8x106/min　　 3. Service life (average):>1500h　　 service life of high-speed precision angular contact ball bearings It has a lot to do with the installation. The following items should be paid attention to: 1. The 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 same height of the inner and outer ring spacers. Under the premise, the parallelism of the spacer ring should be controlled below 1um; 　　 2. The bearing should be cleaned before installation, the inner ring slopes upwards during cleaning, the hand feels flexible, and there is no sense of stagnation. After drying, put in the specified amount of grease, if it is Oil mist lubrication should be put into a small amount of oil mist oil; 　　3. Special tools should be used to install the bearing, and the force should be even, and no beating is allowed; 　　4. Prevent rust regularly.