What do bearing designation numbers mean?

Digit-by-digit explanation of METRIC bearings with examples. Some optional manufacturer specific letter and number codes also explained briefly.
Same designation data is found at: http://www.skf.com/ca/en/products/bearings-units-housings/ball-bearings/deep-groove-ball-bearings/single-row-deep-groove-ball-bearings/single-row/index.html
For more on bearings, see: http://www.skf.com/binary/12-121486/SKF%20rolling%20bearings%20catalogue_tcm_12-121486.pdf

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