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Ball & Roller Bearings both belongs to the category of radial contact bearings.

In case of ball bearings spherical balls are used however in case of roller bearings cylindrical rollers are used.

due to balls used in ball bearings there is a point contact is made whether it is line contact in roller.

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11y ago
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14y ago

The roller ball pen's ink is more liquid.

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Q: What is the difference between a ball point pen and a roller pen?
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