6904 Nachi Bearing Open Japan 20x37x9 Ball Bearings

6904 Nachi Open Ball Bearing 20mm x 37mm x 9mm Made in Japan 6904 Nachi Bearing, the 6904 inner diameter is 20mm, the 6904 outer diameter is 37mm, 6904 width is 9mm. * Item: 6904 Nachi Ball Bearing * Type: Nachi Deep groove Ball Bearing * Dimensions: 20mm x 37mm x 9mm/Metric * ID (inner diameter)/Bore: 20mm * OD (outer diameter): 37mm * Width/Height/thickness: 9mm * Size: 20 x 37 x 9 mm * Quantity: One Bearing * Dynamic load rating Cr: 6,350 N * Static load rating Cor: 3,700 N * Limiting Speed: * Grease Lubrication: 19,000 RPM * Oil Lubrication: 23,000 RPM * Made in Japan Nachi Deep Groove Ball Bearings Deep Groove ball bearings are the most popular of all the ball bearing types because they are available in a wide variety of seal, shield and snap-ring arrangements. The bearing ring grooves are circular arcs made slightly larger than the radius of the ball. The balls make point contact with the raceways (elliptical contact when loaded). The inner ring shoulders are of equal height (as the outer ring shoulders). Deep Groove ball bearings can sustain radial, axial, or composite loads and because of simple design, this bearing type can be produced to provide both high-running accuracy and high-speed operation. Deep Groove ball bearings having an outside diameter less than 9 mm are known as Miniature ball bearings. Deep Groove ball bearings having an outside diameter => 9 mm and a bore diameter < 10 mm are known as Extra-small ball bearings. Standard ball retainers (cages) are made from pressed steel. Machined cages are used in bearing operating at very high speed or for large diameter bearings. Deep groove ball bearings with seals or shields are standardized. They contain proper amount of grease in advance.