6904 Full Ceramic Ball Bearing, the inner diameter is 20mm, outer diameter is 37mm and the width is 9mm, Bearing is made of Ceramic.

• Item: 6904 Ball Bearing
• Type: Full Ceramic Ball Bearing
• Cage: PTFE
• Balls: ZrO2 Ceramic
• Inner/outer races: ZrO2 Ceramic
• Dimensions: 20mm x 37mm x 9mm/Metric
• ID (inner diameter)/Bore: 20mm
• OD (outer diameter): 37mm
• Width/Height/thickness: 9mm
• Size: 20 x 37 x 9 mm
• Quantity: One Bearing
• Highest Temperature: 356 (degrees fahrenheit) = 180 (degrees Celsius)