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Nachi 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).
Nachi 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. Nachi Deep Groove ball bearings having an outside diameter less than 9 mm are known as Miniature ball bearings. Nachi Deep Groove ball bearings having an outside diameter => 9 mm and a bore diameter < 10 mm are known as
Extra-small ball bearings. Nachi 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.
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