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8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing - Front view shown
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8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing - Front view shown 8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing - Angled view shown  
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8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing

Item #: B175  
The 8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing is used on many power wheelchair caster wheels from Pride Mobility including several Jazzy and Quantum models.
 
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8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing

  • Maintenance free design requiring no oil or grease
  • Replacement for bearing reference numbers 638RS, 6382RS, 638Z and 638ZZ
  • Inside diameter (bore) 8 mm (also referred to as 5/16")
  • Outside diameter 28 mm
  • Width (thickness) 9 mm
  • Sold individually (each)
Special Size Note
The inner diameter (bore) of this bearing is 8 mm. The wheelchair and scooter industry commonly refer to the inside diameter of this bearing as 5/16". As long as your existing bearing has a reference number of 638, this is the correct bearing.

8 x 22 mm 608RS Precision Wheelchair or Scooter Bearing Fitment Notes
This bearing is commonly used by Pride Mobility for several of their wheelchair caster assemblies found on several Quantum and Jazzy models. Your existing bearing should have one of these alpha numeric numbers stamped on the shield of the bearing: 638ZZ, 638Z, 638RS or 6382RS. If no reference number is present, it may be on the other side, or you may have to measure.

General Wheelchair and Scooter Bearing Notes
Many bearings found on wheelchairs and scooters have a alpha numeric reference or just a numeric reference number stamped on the side of the bearing which refers to the type and size of the bearing. In most cases, that is all you need to purchase the correct bearing. For alpha numeric reference numbers ending in Z, ZZ, RS, or 2RS, they are all interchangeable (Z and ZZ refer to a metal outer side shield and RS and 2RS refer to a rubber outer side shield protecting the balls inside the bearing). If your bearing has no reference on it, you will have to measure. If the bearing reference appears worn off, you may be able to see it stamped on the other side.
8 x 28 mm 638RS Precision Wheelchair or Scooter Bearing
B175, EYLB175
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