21.5 x 31 x 7 Stainless Steel Premium ABEC-5 Ball Bearing, Silicon Nitride ceramic balls, inner diameter is 21.5mm, outer diameter is 31mm and width is 7mm.

• Item: 21.5 x 31 x 7 Ball Bearing
• Type: Deep Groove Radial Ball Bearing
• Closures: PTFE Sealed
• Quality: Premium ABEC-5
• Material: Stainless Steel
• Balls: Silicon Nitride Ceramic (Si3N4)
• Lubrication: Self Lubricated (Grease SRL) Bearing
• Dimensions: 21.5mm x 31mm x 7mm/Metric
• ID (inner diameter)/Bore: 21.5mm
• OD (outer diameter): 31mm
• Width/Height/thickness: 7mm
• Quantity: One Bearing