Oil Bath Bearing Cap


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Oil Bath Bearing Cap

An oil bath bearing cap is a type of bearing cap that uses oil to lubricate the bearings. The oil is typically contained in a sump or reservoir inside the cap, and it is circulated around the bearings by the rotation of the wheel. This helps to keep the bearings cool and prevent them from overheating.

The price quoted is one pair of oil bath caps.

The oil-bearing cap fits the following hub, disc rotors, and drums

  • Australian Slimline and Holden Bearing Kits
  • 1.98-inch fits Dexter, Kodiak, and DeeMaxx American Bearing Kits (3500lbs)
  • 2.441-inch fits Dexter, Kodiak, and DeeMaxx American Bearing Kits.

Oil bath bearing caps are often used in trailer axles, as they can help to extend the life of the bearings. They are also sometimes used in other applications where the bearings are subject to high loads or temperatures.


  • Increased bearing life: The oil helps to keep the bearings cool and prevent them from overheating, which can extend their life.
  • Improved lubrication: The oil provides more consistent and uniform lubrication to the bearings, which can help to reduce wear and tear.
  • Reduced noise: The oil helps to dampen the noise and vibration generated by the bearings, which can make the trailer more comfortable to tow.


  • Increased complexity: The oil bath bearing cap is a more complex design than a standard bearing cap, which can make it more difficult to install and maintain.
  • Increased cost: The oil bath bearing cap is typically more expensive than a standard bearing cap.
  • Oil leaks: If the oil seal fails, the oil can leak out, which can damage the bearings and the trailer axle.

Overall, oil bath bearing caps can be a good option for extending the life of trailer axle bearings. However, they are more complex and expensive than standard bearing caps, and they can be more prone to oil leaks.

Here are some of the factors to consider when choosing an oil bath bearing cap:

  • The size of the cap: The cap must be the correct size to fit the axle.
  • The type of oil: The oil must be compatible with the bearings.
  • The oil level: The oil level must be maintained to ensure that the bearings are properly lubricated.
  • The oil seal: The oil seal must be in good condition to prevent oil leaks.

If you are considering using an oil bath bearing cap, be sure to consult with a qualified mechanic to ensure that it is the right choice for your application.

In addition, a special oil seal is required to be purchased with the above oil bath caps.

This Oil Seal is multi-ribbed and dual function ensuring a watertight seal and eliminating unwanted friction during rotation.

Visual inspection before hookup to ensure the oil has not turned Black. Black oil indicated bearing wear.

Purchase Kodiak Bearing Oil Kit here.

The oil Bath cap fits the following hubs and disc rotors


Do not overfill the bearing cap. The correct oil level is below the grommet. When filling, remove the grommet and fill until no further oil flows into the bearing cavity. Replace the grommet.

Bearings still require regular checking for tightness. Place a container under the oil cap and remove the cap.

Finally, wear and tear on the bearing castings causes contaminated oil.

Additional information

Weight1 kg
Dimensions20 × 10 × 6 cm
Cap Size

45.3mm Australian, 1.98-inch, 2.441-inch


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