Patent ID: 6874943

Claim:
An antifriction bearing comprising an inner race, an outer race having an outer peripheral surface to be brought into contact with other member for use as a roll, and a plurality of rolling elements arranged between the inner and outer races, the bearing being characterized in that a portion of the outer race from an outer peripheral surface thereof to a depth of 3 mm has a hardness of 58 to 62 in Rockwell C hardness (hereinafter referred to as “HRC”) and a hardness gradient of up to 1 HRC/1 mm from the outer peripheral surface inward, the depth portion containing 5 to 18 vol. % of retained austenite, a portion of the outer race from an inner peripheral surface thereof to a depth of 1 mm having a hardness of 61 to 64 in HRC and containing 5 to 15 vol. % of retained austenite, a center portion of the thickness of the outer race between the inner and outer peripheral surfaces thereof having a hardness of 35 to 42 in HRC.