PDF catalog download (free)View knurled suface of the steel ball cage made by WELLBO international Industrial CO. Long life steel ball retainer is our new developed technology, this design make it with some excellent performances.1) easy lubricate save grease 2) there is no groove around the ball, this can save much space to align more steel balls than standard ones.3) digity and mechanical strength improve much,so working life increase.4) All ball cage made by automatice machines, actually cost not increasing, even competitive for normal ones.
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