689 Nachi Bearing, Made in Japan, the 689 inner diameter is 9mm, the 689 outer diameter is 17mm, the 689 width is 5mm.

• Item: 689 Nachi Ball Bearing
• Type: Nachi Deep groove Ball Bearing
• Radial Clearance: C3
• Dimensions: 9mm x 17mm x 5mm/Metric
• ID (inner diameter)/Bore: 9mm
• OD (outer diameter): 17mm
• Width/Height/thickness: 5mm
• Size: 9 x 17 x 5 mm
• Quantity: One Bearing
• Made in Japan