R-830Y52 is an Open Miniature Ball Bearing, R-830Y52 Bearing has an inner diameter of 3mm, R-830Y52 small Bearing outer diameter is 8mm and R-830Y52 Bearing width is 2.5mm, R-830Y52 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-830Y52 Bearing
• Type: Radial Small Bearing
• R-830Y52 Dimensions: 3mm x 8mm x 2.5mm
• Size: 3 x 8 x 2.5 mm (3x8x2.5)
• Material: 52100 Chrome Steel
• Quality: Standard Precision
• Bearing Inner Diameter: 3mm (0.118"inch ID)
• Bearing Outer Diameter: 8mm (0.315"inch OD)
• Bearing Width: 2.5mm
• Closures: Open
• Standard: Metric
• Quantity: One Bearing