S6004 Bearing 20x42x12mm Si3N4 Ceramic Sealed Premium ABEC-5 BearingS6004 Open Ball Bearing Premium ABEC 5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 20 x 42 x 12 mm S6004 Open Stainless Steel, radial and deep groove ball bearing,bearing is made from stainless steel with Ceramic Balls (Si3N4) and Nylon cage,the quality is set to EMQ (Premium ABEC 5 quality) to ensure high speed,inner diameter is 20mm, outer diameter is 42mm and width is 12mm S6004 Ball Bearing Deep Groove Radial Ball Bearing Closures: Open
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