What is a Ball Bearing?The Function of Ball BearingsFrom small and large motors to car axles to electric fans and hard disc drives (HDDs), ball bearings are used in a wide array of machines for rotary motion. Ball bearings support rotary parts and reduce friction to facilitate the smooth operation of machines. Ball Bearing ComponentsBall bearings are comprised of four major parts: a large ring (outer ring), a small ring (inner ring), balls between the rings (steel balls), and a cage to prevent the balls from hitting each other. The modern structure dates back to around 1500, when Leonardo da Vinci invented ball bearings to reduce friction against the axles of horsedrawn carts. For more than 500 years, the ball bearing has been defined by this simple structure.Miniature Ball Bearings are a type of rolling-element bearing that uses balls to maintainthe separation between the moving parts of the bearing. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. Radial Ball bearings can support moderate radial loads and moderate axial loads (parallel to the shaft). They can operate at high speeds . Ball bearings with shields or seals for protection can be lubricated to last for the operating life. Sometimes ball bearings are also called "deep groove ball bearings."TECHNICAL SPECSItem: 638RS Ball BearingType: Deep Groove Ball BearingMaterial: 52100 Chrome SteelClosures: 2 SealedGrade: ABEC-1Size: 8mm x 28mm x 9mmInner Diameter: 8mmOuter Diameter: 28mmWidth: 9mmDynamic load rating Cr: 4,160 NStatic load rating Cor: 1,780 NChamfer: 0.3 mmQuantity: 1 lot = 4 Pcs Bearings FACTORY STORYItem specifics:Torque capacity: 8*28*9mmSurface roughness: Ra 0.05Material: SteelModel number: 638 2RSStructure: Deep GrooveCoatings: Grease
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