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Bearing outer diameter is 57

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RMS20X200 Airtac Rodless Magnetic Air Cylinder Deep Groove Ball Bearings SS-63 (Stainless Steel) MF25X100USG Airtac Round Body AirRMS20X200 Airtac Rodless Magnetic Air Cylinder Rodless pneumatic cylinder, magnetic, basic version, 20mm bore, 200mm stroke, no mounting bracket, PT thread type Acting Type Double Acting Airtac rms Rodless Magnetic Air Cylinder Airtac Product Series Airtac RMS Rodless Magnetic Air Cylinder Bore Size 20mm Brand Airtac Component Type Rodless Pneumatic Cylinder Stroke Length 200mm Thread Type PT