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1)The material for U-joint cross is 20Cr or 20CrMnTi alloy steel(hardness after heat treatment is HRC 58 -63 degree)
2)Thematerial for bearing caps is 20Cr or 20CrMnTi alloy steel(hardness after heat treatment is HRC 58 -63 degree);
3)Thematerial for needle roller is GCr15(hardness after heat treatment is HRC 59 -63 degree);
4)The material for circlip is 65Mn;
5)Cementite deepness:0. 8-1.3mm