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To order the correct replacement trailer hub or trailer hub and drum, the following steps can be used to simplify the ordering process:

  1. Determine the Bolt Pattern of the Hub.
  2. Determine the Inner and Outer Bearing Numbers. Note whether the bearings use grease or oil bath lubrication.
  3. Measure the old hub seal to insure that the I.D. and O.D. dimensions will be the same.
  4. Verify the Stud Diameter.
  5. If the axle is a brake axle, measure the diameter and width of the brake to determine brake size.
  6. Look for any casting numbers on front or rear of hub or hub and drum.


  • Inner/Outer Bearing Numbers
  • Type of Bearing Lubrication
  • Stud Size
  • Seal Size
  • Drum Size
  • Confirm brake size and/or hub pilot diameter (if applicable).
  • Complete assemblies contain the hub or hub and drum, inner and outer bearings, seal, grease cap or oil cap and all necessary wheel nuts.