... :5-8mm 4.Hardness for quenching and tempering:HRC28-32 Track link assy PC2201. Product Information Material40MnBFinishSmoothColorsBlack or yellowTechniqueForging castingSurface HardnessHRC50-56 ... ), E300B, E330, D3C, D5, D5B, D5D, D6C, D6D, D6H, D7G, D8K 4) Daewoo: DH220, DH280, R200, R210 5) Kato: HD250, HD400 ...