604 Full Ceramic Si3N4 Bearing 4x12x4 Miniature604 Full Ceramic Ball Bearing Silicon Nitride 4 x 12 x 4 mm 604 Full Ceramic Ball Bearing, measures an inner diameter of 4mm, outer diameter is 12mm and the width is 4mm, a standard bearing size commonly used in a variety of industrial and commercial applications, Bearing is made from Ceramic. 604 Ball Bearing Full Ceramic Ball Bearing Cage Material: PTFE (Polytetrafluoroethylene) Balls: Si3N4 Ceramic (Silicon Nitride) Inner outer races: Si3N4 Ceramic
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