SMR3121.5-2RS Ceramic Bearing 21.5x31x7 Si3N4 PTFE ABEC-5 Bearing

21.5 x 31 x 7 Stainless Steel Premium ABEC-5 Ball Bearing Silicon Nitride Ceramic Balls 2 PTFE Seals 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. 21.5 x 31 x 7 Ball Bearing 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: 7mm Quantity: 1 Bearing VXB Category: Hybrid ceramic bearings💡 What Does ABEC-5 Mean? ABEC-5 is a precision rating from the Annular Bearing Engineers’ Committee (ABEC), indicating that the bearing is manufactured with tighter tolerances for improved accuracy and performance. Bearings rated ABEC-5 are designed for high-speed, low-friction operation, making them ideal for electric motors, precision tools,