7801 Full Ceramic (Zirconium Oxide) Angular Contact Ball Bearing, the inner diameter is 12mm, outer diameter is 21mm and the width is 5mm, this is a popular size that could be used in many applications, Bearing is made of Ceramic.

• Item: 7801 Ball bearing
• Type: Angular Contact Full Ceramic
• Balls: ZrO2 (Zirconium Oxide) Ceramic
• Cage: PTFE
• Dimensions: 12mm x 21mm x 5mm/Metric
• ID (inner diameter)/Bore=12mm
• OD (outer diameter)=21mm
• Width/Height/thickness=5mm
• Quantity: One ball bearing
• Inner/outer races: ZrO2 (Zirconium Oxide) Ceramic
• Size: 12 x 21 x 5 mm
• Highest Temperature: 356 F (degrees fahrenheit) = 180 C (degrees Celsius)