684 Open Ball bearing, inner diameter is 4mm, outer diameter is 9mm and width is 4mm, Bearing is made of Chrome Steel.

• Item: 684 Ball Bearing
• Type: Deep groove ball bearing
• Closures: Open
• Dimensions: 4mm x 9mm x 4mm/Metric
• ID (inner diameter)/Bore: 4mm
• OD (outer diameter): 9mm
• Width/Height/thickness: 4mm
• Size: 4 x 9 x 4 mm
• Quantity: One Bearing
• Dynamic load rating Cr: 640 N
• Static load rating Cor: 230 N
• Limiting Speed:
  • Grease Lubrication: 59,000 RPM
  • Oil Lubrication: 70,000 RPM