R-830 is an Open Miniature Ball Bearing, R-830 Bearing has an inner diameter of 3mm, R-830 small Bearing outer diameter is 8mm and R-830 Bearing width is 3mm, R-830 Bearing is made of Chrome Steel, 52100 is a high carbon, chromium containing low alloy steel, heat treatment and hardening of 52100 alloy steels will get you 60 Rockwell hardness and very common in bearings.

• Item: R-830 Bearing
• Bearing Inner Diameter: 3mm
• Bearing Outer Diameter: 8mm
• Bearing Width: 3mm
• Standard: Metric
• Type: Radial Miniature Bearing
• Closures: Open
• Size: 3 x 8 x 3 mm
• Material: 52100 Chrome Steel
• Quality: Standard Precision
• Quantity: One Bearing