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2. Ball bearing - Wikipedia

   en.wikipedia.org/wiki/Ball_bearing

   Working principle for a ball bearing; red dots show direction of rotation. A four-point angular-contact ball bearing. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It ...

3. Ball (bearing) - Wikipedia

   en.wikipedia.org/wiki/Ball_(bearing)

   [3] [4] Lower grades also have fewer defects, such as flats, pits, soft spots, and cuts. The surface smoothness is measured in two ways: surface roughness and waviness. [4] Size refers to the farthest possible distance between two points on the ball's surface, as measured by two parallel plates in contact with the surface.

4. Bearing (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(mechanical)

   A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

5. Pitch bearing - Wikipedia

   en.wikipedia.org/wiki/Pitch_bearing

   Size comparison: Child in wind turbine rotor hub without blades One row four point contact ball bearing with gear spur for the pitch drive. Mostly large rolling element bearing are used as pitch bearings. [4] The bearing is subjected to high bending moments, radial and axial loads in both directions.

6. Wire race bearing - Wikipedia

   en.wikipedia.org/wiki/Wire_race_bearing

   Wire race bearings can be large yet lightweight and with small profile and good precision. Wire races have little intrinsic structure and must be adequately supported by the bearing housing. Balls, rollers or even cross rollers are used as rolling elements. Due to the design wire race bearings are commonly called '4-point-contact' bearings. [1]

7. ABEC scale - Wikipedia

   en.wikipedia.org/wiki/ABEC_scale

   Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.