1. super-precision bearing parts bearing steel tempered by a high temperature, then set code required to JB / T2974 (the part by tempering at high temperatures, the working temperature of up to 150C °, which code for the / S0; parts through hot temperatures, the working temperature of up to 200 ° C, which code for the / S1; parts tempered at high temperature, the working temperature up to 250 ° C, which code for the / S2; parts tempered at high temperature, work temperatures up to 300 ° C, which code for the / S3; parts tempered at high temperature, the working temperature up to 350 ° C, which code for the / S4).
2. Ball screw support bearing parts made of heat resistant steel, then set code required to JB / T2974 (the material is Cr4Mo4V, then set code is / HN; material Cr14Mo4, then set code is / HN1; material Cr15Mo4V, then set code is / HN2; material W18Cr4V, then set codenamed / HN3).
Precision bearings according to ISO grading standards are divided into: P0, P6, P5, P4, P2. Rank higher in turn, where P0 is the general accuracy, other grades are precision level. Of course, different classification standards, different types of bearings, their classification method somewhat different, but the meaning is to the. The use of performance requirements of precision bearings rotating body with high runout accuracy, high-speed rotation and small changes in friction and friction.
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