What is inner diameter of bearing No. 6205?

This question was previously asked in
ISRO SHAR Technician B Fitter 29 April 2018 Official Paper
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  1. 62 mm
  2. 20 mm
  3. mm
  4. 25 mm

Answer (Detailed Solution Below)

Option 4 : 25 mm
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Detailed Solution

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Concept:

Bearing:

  • It is a mechanical component used to reduce friction between two rotating or sliding surfaces.
  • The bearings are designated by a number.
  • In general, the number consists of at least three digits.
  • Additional digits or letters are used to indicate special features e.g. deep groove, filling notch etc. The last three digits give the series and the bore of the bearing.
  • The last two digits from 04 onwards, when multiplied by 5, give the inner diameter in mm.
  • The third from the last digit designates the series of the bearing.

Diameter of shaft is 05 × 5 = 25 mm. (Last two digits × 5)

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