6304 Full Ceramic Ball Bearings, bearing is Zirconium Oxide, the inner diameter is 20mm, outer diameter is 52mm and the width is 15mm, this is a popular size that could be used in many applications, Bearing is made of Ceramic.

• Item: 6304 Ball bearings
• Type: Full Ceramic Ball bearings
• Cage: PTFE
• Balls: ZrO2 (Zirconium Oxide) Ceramic
• Inner/outer races: ZrO2 (Zirconium Oxide) Ceramic
• Dimensions: 20mm x 52mm x 15mm/Metric
• ID (inner diameter)/Bore: 20mm
• OD (outer diameter): 52mm
• Width/Height/thickness: 15mm
• Size: 20mm x 52mm x 15mm
• Quantity: One Bearing
• Highest Temperature: 356 (degrees fahrenheit)=180 (degrees Celsius)