6801 Full Ceramic Bearing Si3N4/PTFE 12x21x5mm6801 Full Ceramic Ball Bearing Silicon Nitride 12mm x 21mm x 5mm 6801 Full Ceramic Silicon Nitride Ball Bearing with 14 Si3N4 Ceramic Balls, inner diameter is 12mm, outer diameter is 21mm and width is 5mm. 6801 Ball Bearing Full Ceramic Silicon Nitride Ball Bearing Material: Full Ceramic Si3N4 (Silicon Nitride) Cage Material: PTFE (Polytetrafluoroethylene) Closures: Open Balls: 14 Ceramic Balls Si3N4 (Silicon Nitride) Dimensions: 12mm x 21mm x 5mm
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