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Classification principles for the size of rolling bearings

1. Miniature bearings - bearings with a nominal outer diameter range of D < 26mm;
2. Small bearings - bearings with a nominal outer diameter range of 26 ≤ D < 60mm;
3. Small and medium-sized bearings - bearings with a nominal outer diameter range of 60 ≤ D < 120mm;
4. Medium and large bearings - bearings with a nominal outer diameter range of 120 ≤ D < 200mm;
5. Large bearings - bearings with a nominal outer diameter range of 200 ≤ D < 400mm;
6. Extra-large bearings - bearings with a nominal outer diameter range of 400 ≤ D < 2000mm;
7. Heavy bearings - bearings with a nominal outer diameter range of D ≥ 2000mm.

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