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ABEC 3 radial bearing with 8 mm inner diameter, 22 mm outer diameter, 7 mm width and double lip seal with light contact, running continuously in a groove in the sense of a labyrinth seal. ABEC 3 bearings use grade 10 chrome steel balls and 52100 high carbon chrome alloy treads. The precision balls are round with a deviation of 10/1000000 ", which is twice as round as the industry standard. The alloy of the bearing shells are manufactured in a vacuum process and hardened to Rockwell hardness R-62. Then a high-gloss polishing is carried out for ABEC-3 Precision and noiseless operation The riveted steel cage increases toughness.