Surfaces "H":a) Induction hardening to achieve 350 HV at 1.5-3 mm.Surface hardness min 58 HRC;b) Case hardened to achieve 500 HV at 0.4-0.6 mm.Surface hardness min 58 HRC;Core hardness 23 HRC min.Remained surface of the part сan be protected fromcase hardening. Other surfaces hardness 23 HRC min.