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

638 Full Ceramic Ball Bearing, measures an inner diameter of 8mm, outer diameter is 28mm and the width is 9mm, a standard bearing size commonly used in a variety of industrial and commercial applications, Bearing is made from Ceramic.

• 638 Ball Bearing
• Full Ceramic Ball Bearing
• Cage Material: PTFE (Polytetrafluoroethylene)
• 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: 9mm
• Size: 8x28x9
• Quantity: 20 Bearings