638RS Precision Wheelchair or Scooter Bearing (8x28x9 mm)

The 638RS Precision Wheelchair or Scooter Bearing (8x28x9 mm) is used on a variety of wheelchairs and scooters and features a maintenance free design.

Product Features

• Maintenance free design and pre-greased
  
• High quality double shielded design keeps grease in and contaminants out
  
• Replacement for bearing reference numbers 638RS, 6382RS, 638-2RS, 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.

Fitment Notes:
This bearing is used on a variety of power wheelchairs and scooters plus many non-mobility related items. Commonly used by Pride Mobility for several of their wheelchair caster assemblies found on several Quantum and Jazzy models. Verify the reference number is 638RS, 6382RS, 638-2RS, 638Z or 638ZZ. If no reference number is found, you'll have to measure. This is not the same bearing as Primo 638C2RS100, please contact us if this is the bearing you need.

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. Click the "Fitment" tab for more information on how to identify or measure your bearing.