R-620 is an Open Miniature Ball Bearing, R-620 Bearing has an inner diameter of 2mm, R-620 small Bearing outer diameter is 6mm and R-620 Bearing width is 2.3mm, R-620 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-620 Bearing
• Type: Radial Small Bearing
• Closures: Open
• R-620 Dimensions: 2mm x 6mm x 2.3mm
• Size: 2 x 6 x 2.3 mm
• Material: 52100 Chrome Steel
• Bearing Inner Diameter: 2mm
• Bearing Outer Diameter: 6mm
• Bearing Width: 2.3mm
• Standard: Metric
• Quality: Standard Precision
• Quantity: One Bearing