Wholesale 638 Full Ceramic Si3N4 Bearing 8x28x9 Miniature-Pack of 20

638 Full Ceramic Ball Bearing, the inner diameter is 8mm, outer diameter is 28mm and the width is 9mm, this is a popular size that could be used in many applications, Bearing is made of Ceramic.

• Item: 638 Ball Bearing
• Type: Full Ceramic Ball Bearing
• Cage: PTFE
• Balls: Si3N4 Ceramic (Silicon Nitride)
• Inner/outer races: Si3N4 Ceramic (Silicon Nitride)
• Dimensions: 8mm x 28mm x 9mm/Metric
• ID (inner diameter)/Bore: 8mm
• OD (outer diameter): 28mm
• Width/Height/thickness: 9mm
• Size: 8x28x9
• Quantity: 20 Bearings