O.S. Bearing Front 21XZ-B
O.S. Bearing Front 21XZ-B

O.S. Bearing Front 21XZ-B

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Your Price: $26.99
Part Number: OSM23731020
Availability: In Stock.
This is the Front Bearing for the O.S. Max 21 XZ-B Series Engines. 


  • Steel construction
  • Shielded front (to keep out dirt and prevent fuel leakage)
  • Open back (to allow oil in fuel to lubricate balls)


  • One Ball Bearing


  • Installation into crankcase


  • Inner Diameter: 7mm
  • Outer Diameter: 19mm
  • Thickness: 6mm


  • This is the bearing that sits in the front portion of the crankcase which supports the crankshaft.

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