Imported high-speed precision angular contact ball bearings are mainly used in high-speed rotation occasions with light loads, which require bearings with high precision, high speed, low temperature rise and low vibration and a certain service life. It is often used as a pair of supports for high-speed motorized spindles, and is a key accessory for high-speed motorized spindles of internal surface grinders. Main technical indicators: 1. Bearing accuracy index: Exceed GB/307.1-94 P4 level accuracy 2. High-speed performance index: dmN value 1.3~1.8x 106 /min 3. Service life (average): ＞1500 h High-speed precision angular contact ball The service life of the bearing 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 spacer for the bearing should be ground. Under the premise of the same height, the parallelism of the spacer should be controlled below 1um; 2. The bearing should be cleaned before installation. When cleaning, the slope of the inner ring should be upward, the hand feeling is flexible, and there is no stagnation. After drying, put the specified amount of grease , If it is oil mist lubrication, a small amount of oil mist oil should be put in; 3. Special tools should be used for bearing installation, the force should be even, and knocking is strictly prohibited; 4. Bearing storage should be clean and ventilated, free of corrosive gas, and the relative humidity should not exceed 65%. Long-term storage should be regularly rust-proof.