Amazon.com: Ball Bearing Pulley
3). Structrue of Inner Bearing: Pulley wheel bearing plastic covered ball bearing 607 ZZ . Bearing rings: Dimension tolerance, geometric tolerances, and surface quality of bearing’ s working surface will influent the operating noise.Naimei Bearing adopts precision CNC machining to dimension precision, geometric tolerances, design drawing, mold making, grinding, cleaning, assembly, testing ...
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