ball bearings - Sizes
2015-4-2 · ball bearings. Because the best ball bearings in the early 20ᵗʰ century were made by German manufacturers, ball bearings have usually been sized in millimeters, even those made in the United States – but the balls themselves were frequently sized in inches. The Anti-Friction Bearing Manufacturers Assn. adopted a classification of ball bearings according to their construction, with each ...
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