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

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

$26.99 USD
$29.99 USD $26.99 USD
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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, 3D printers, and performance equipment where smooth rotation and long service life are essential.

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