Ceramic Ball Bearings The hybrid ceramic ball bearing features bearing rings made of bearing steel (Gcr15) or stainless steel (9cr18). The ceramic ball bearing is mainly made of silicon nitride (Si3N4), rconia (ZrO2) or alumina (Al2O3), among which Si3N4 is of excellent overall erformance and has become the preferred material for ceramic ball bearing. The density of Si3N4 ceramic is 3.20g/cm3, much lower than that of bearing steel (7.85g/cm3). For this reason, the ceramic rolling element can effectively restrain the centrifugal force generated by high-speed rotation and reduce the load of rolling element. Meanwhile, it can also reduce the rotational slide between the rolling element and the raceway surface and thus prevent surface damage. Therefore, ceramic ball bearing is the best choice for high-speed rotation application, such as high-speed motor spindle bearing, machine spindle bearing, dental drill bearing, high-speed wheelhead bearing, instrument bearing and hard drive bearing. It can also be used in civilian products like roller skate, aeromodelling and electric toy. Stainless Steel Bearings Stainless steel bearings can work well under such enviroment where is moisture, corrosive and abrasive. They are widly used for food and beverage processing machinery, medical appliances and medicine equipments. Stainless steel bearings(440C) The high performance stainless steel bearings can provides not only with the cleanliness and corrosion resistance characteristic also with the high accuracy and excellent wear resistance compare to the high carbon chrome steel bearings. The rings and balls are made of the material as a standard constructure of stainless steel bearing, The rings and balls are made of the material of AISI440C( 9Cr18Mo or 9Cr18), the cage and the framework of seal adoption the AI304 or AI316, production accuracy could reach ISO standard ABEC-1 and above, and the vibration level reach Z1 grade and above. Austenite stainless steel bearings We also can offer non-standard stainless steel bearings to meet some special type needs in engineering. Compare to high carbon chrome martensitic stainless steel bearing, Austenite stainless steel bearings have even more excellent corrosion and wear resistance, magnetism resistance. The whole Austenite stainless steel bearings are made of AISI SUS316L(316)or SUS304 ( including inside and outside rings, balls and cage). Austenite stainless steel bearings can't harden completely by heat treatment, so it should not choose for heaver load or higher speed. Plastic bearing 1)Bearing ring: POM, PP, PEEK, PTFE, UPE 2)Ball: Ceramic ZrO2 ball, Si3N4 ball, glass ball and stainless steel ball material 3)cage: PTFE, Nylon The temperature will attainability -40~260 centi-grade.