1. Brass
  2. Chromium steel
  3. Cast iron
  4. Plastic 
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1 Answers

Option 2 : Chromium steel

Concept:

  • A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.
  • The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.
  • It achieves this by using at least two races to contain the balls and transmit the loads through the balls.
  • As one of the bearing races rotates it causes the balls to rotate as well. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.
  • There are four major parts to a standard ball bearing: the outer race, the rolling balls, the inner race, and the cage.
  • Balls, races in case of ball bearings are made up of 52100 chrome steel.

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