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How to Measure Trailer Spindle and Hub to Determine Dimensions for Grease Seal


I have an older model Aros boat trailer and I need to replace the wheel bearing grease seals. I am having no luck in finding them. The visible number on the seal in NOK AB1090E each seal has a small spring that provides tension for the rubber portion of the seal. Any help will be greatly appreciated.


Expert Reply:

Your description of your boat trailer's grease seals sounds like you have double-lip type seals which are preferred, especially for boat trailers, since they do the best job of repelling water. Although I could not cross-reference your seal part number to find a current equivalent I can help you with measuring your spindles and hub bore to find one that will fit. Please refer to the linked diagram.

You will need to measure your spindle at the point B on the diagram to get the inner diameter of the seal you need; and also measure the rear bore of the hub where the seal installs to get the outer diameter of the seal. This will require a digital caliper that can read to the nearest thousandth of an inch, like 1.234-inches for example. Using these spindle and hub bore measurements is more accurate than trying to measure the old seal since the seals tend to become deformed when they are removed.

Once you have your two dimensions you can refer to the linked page that shows our grease seals. Click on the inner and outer diameter dimensions and you'll then see the available seals that will fit your spindle and hub.

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