Ball bearings are generally made of___________________?
Correct answer: C. Chrome carbon steel
- A. Plain carbon steel
- B. Stainless steel
- C. Chrome carbon steel
- D. Malleable cast iron
Explanation
Ball bearings require high hardness, wear resistance, and fatigue strength, which are provided by high-carbon chromium steel, commonly called chrome carbon steel. Plain carbon steel and cast iron do not provide the same rolling-contact durability.
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