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        Precision extra small ball bearing

        STT brand extra-small ball bearing means the outside diameter of ball bearings are less than 8 mm, which comprise an inner ring, outer ring, balls (metal, ceramics ets.), metal shields and/or rubber seals and snap rings. Essential to remain long time running with high-precison rotary status, ball bearings accuracy level is the most important factor to determine the rotational accuracy. 

        STT bearing type scope includes 600 series, MR series, R series, F 600 series, MF series, FR series etc., below information is the P/N description: