... 2.Surface hardness:HRC52-58 3.Hardness depth:5-8mm 4.Hardness for quenching and tempering:HRC28-32 ... PC130, PC240, PC200-1-3-5-6, PC220-1-3-5, PC300-3-5, PC400-1-3-5, D20, D30, D31, D50 ... EX100, EX120, EX150, EX200-1-2-3, EX300-1-3-5, EX400, UH08, UH073) Caterpillar: E110B, E200B (E320), E240 ... D6H, D7G, D8K 4) Daewoo: DH220, DH280, R200, R210 5) Kato: HD250, HD400 (HD450), HD500, HD550, HD700 (HD770), ...