I. Introduction Our company is a professional manufacturer of miniature bearings business, while operating various types of imported bearings, the production range between 1mm-22mm in diameter, there are 6 series, F series, MR series, R series, S series etc.; these series of bearings Our long-term stock price has an absolute advantage; while my company as well as all kinds of self-aligning ball bearings, cylindrical roller bearings, double row spherical roller bearings, needle roller bearings, angular contact ball bearings , tapered roller bearings, thrust ball bearings, spherical roller thrust bearings, linear bearings; quality and reasonable prices. Welcome to the needs of the company manufacturers call us to discuss two bearing material 1) rings, rolling the required material properties: rolling fatigue strength, high hardness, high wear resistance 2) cage material required performance : good dimensional stability, mechanical strength also need good processability. Depending on the application, and the required impact resistance, heat resistance, good corrosion resistance. 3) Materials and rolling rings: the rings and rolling typically use high carbon chromium bearing steel. Most of the bearing steel in the JIS SUJ2. SUJ2 chemical composition, in the world, as the bearing material has been normalized. For example: with AISL52100 (United States), DIN100Cr6 (West Germany), BS535A99 (UK), etc. are the same kinds of steel. Steel from the above, according to specific uses, the use of high-speed steel having excellent heat resistance, good corrosion resistance of stainless steel. 4) cage material: stamping retaining material, the use of low carbon steel. Depending on the application, use brass, stainless steel plate. Cutting material holder, the use of high-strength brass, carbon steel, in addition to a synthetic resin is also used. Third, the bearing performance 1) low noise; 2) high speed; 3) precision; 4) long life. Fourth, technical data 1) the role of lubrication on bearing lubrication rolling bearing fatigue life and friction, wear, temperature, vibration, etc. have a major impact, not properly lubricated bearings will not work. Analysis showed that causes bearing damage, bearing damage and about 40% are related to poor lubrication. Therefore, a good bearing lubrication is an effective measure to reduce friction and wear of the bearing. In addition, the bearing lubrication as well as heat, rust, seals, and other effects to ease the impact. 2) Grease lubrication grease base oil, thickener and additives for lubricants. When selected, you should choose very suitable for bearing grease conditions, due to different trademarks, the performance will also be a great difference, so when the choice must be careful. Bearing grease commonly used calcium-based grease, grease, sodium, calcium and sodium based grease, lithium grease, aluminum grease and molybdenum disulfide grease. Number of bearing grease filled, to fill the space inside the bearing 1/2-1/3 as appropriate. Should reduce speed to 1/3. Excessive grease will make the temperature increased. 3) Oil lubrication at high speed, high temperature conditions, greased oil lubrication is not suited to be used. By oil circulation, can take a lot of heat. 4) Viscosity is an important characteristic of lubricating viscosity, the viscosity of the oil film thickness directly affects the size of the flow of the lubricant between the friction surface and the formation of the charge, the temperature of the bearing oil viscosity is generally 12-18cst. The higher the speed should be selected lower viscosity, heavier loads should be selected high viscosity. Commonly used lubricants have mechanical oil, high-speed machine oil, turbine oil, compressor oil, transformer oil, cylinder oil. Precision bearings and bearing tolerance level according GB/T307-94> national standards can be divided into GEDCB. Standard Accuracy Standard Accuracy GB/T307--94 BCDEG ISO CLASS2 CLASS4 CLASS5 CLASS6 NORMAL CLASS DIN P2 P4 P5 P6 P0 ANSI ABEC9 ABEC7 ABEC5 ABEC3 ABEC1