How to Find Ball Bearing Size

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Finding the size of a ball bearing in need of replacement, before purchase a new one, may save money. You also will have the correct replacement part the first time and avoid a return trip to the store. Determine ball bearing size by making a few measurements in millimeters. Ball bearings allow objects to move or rotate freely. Each disk shaped bearing contains a number of balls that roll. (See Reference 1) Ball bearings are used in industrial equipment as well as many types of wheels.

Things You'll Need

  • Metric ruler
  • Measure the total diameter of the ball bearing in millimeters, as viewed from its circular side. Diameter measure the width of a circle along a line that passes through its center. (See Reference 2)

  • Determine the diameter, in millimeters, of the central hole in the bearing. This will ensure the replacement bearing fits onto its shaft.

  • Measure the thickness of the bearing as viewed from its edge in millimeters. You now have all relevant dimensions of the ball bearing.

References

  • Photo Credit ersatzteil image by lofik from Fotolia.com
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