High temperature bearings and plain bearings are different models. Usually two cases:

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).