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48~55 Hrc in the range from the base of the sprocket up to 7 mm depth- Uniform hardness of 37-48 Hrc in the range at 7-20mm from the tip of the tooth
48~55 Hrc in the range from the base of the sprocket up to 7 mm depth- Uniform hardness of 37-48 Hrc in the range at 7-20mm from the tip of the tooth

