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In motors/pumps generally following bearings are used (ref: https://www.nke.at/en/bearings-applications/applications/electrical-motors):

  1. Deep groove ball bearings
  2. Cylindrical roller bearings
  3. Angular contact ball bearings

All these bearings are designated with bearing number for example: Deep groove ball bearings: 6205.

Form this bearing no. we can easily have the information about its outer dimensions as given here:https://www.skf.com/in/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/productid-6205 OR from its catalogue.

Based on these outer dimensions, is there any way out to calculate the following specifications/dimensions:

  1. Pitch diameter
  2. Ball diameter
  3. Number of balls in the bearing
  4. Contact angle of the balls

Can somebody please let me know how can we go about this ?

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  • $\begingroup$ Calculate? Use a lookup table... $\endgroup$ – Solar Mike Jan 4 at 6:42
  • $\begingroup$ @SolarMike, could you please provide some reference/links for the lookup tables ? I tried finding but couldn't get any, $\endgroup$ – Ranjan Pal Jan 6 at 13:38
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The trade numbers typically give you the envelope dimensions (inner and outer diameters, thickness). Everything else is at the discretion of the manufacturer - pitch diameter, rolling element size, quantity and contact diameter. This is why for the same trade number bearing you might see several different manufacturers, all with different load ratings.

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