| 摘要 |
Balls 3 provided between an outer and an inner ring 1 and 2 are made of high carbon chromium bearing steel. Depending on actual operating conditions, at least one of the outer and inner rings that require corrosion resistance and stable bonding strength is made of martensitic stainless steel with a hardness of HRC 58 or above and an eutectic carbide diameter of 10 .mu. m or below, thus improving the quietness and rust prevention property.
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