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After reading a few texts on the topic of sliding contact bearings I am confused between the bearing characteristic number and the sommerfield number.

As per J.E shigley's text both bearing characteristic number and sommerfield number are same and is given asenter image description here

But as per V.B bhandari,R.S khurmi texts the bearing characteristic number and sommerfield number are different and is given asenter image description hereenter image description here

then again in Wikipedia I have seen that they too followed the shigley's text definition with an additional number called Hersey number given asenter image description here

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  • $\begingroup$ Hersey number could be the american equivalent. $\endgroup$
    – Solar Mike
    Jun 4 '20 at 4:06

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