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How Tight Should Castle Nut be on Trailer Hub


2005 Horton car hauler with 6000 lb. Dexter EZ lube axles. I bought this used and noticed that all 4 wheels had play in them, so when I repacked the bearings I tightened the nut enough to eliminate the play but still allow the wheel to turn freely. Using a laser thermometer, I took it out for about a 20 minute drive loaded with a car in the trailer. I noticed the hubs came up to 95-115 degrees within about 2 miles, but never got any hotter than that. The air temperature was 55 degrees, so about a 40-50 degree temp rise. Is that normal or do I have the bearings too tight?


Expert Reply:

There is no specific torque rating for the castle nut that holds your hub in place. We recommend tightening the castle nut down until it stops, and then backing it off to the next notch wheel the tang washer will fit into the castle nut. Over tightening the nut can lead to the spindles and bearings overheating, which can damage them.

We have a video that outlines the proper way to remove and install a trailer hub, to view the video, click on the provided link.

95 degrees on a 55 degree day seems a bit warm. I would try the above mentioned install method for the nut which should reduce the tension.

expert reply by:
Jameson C

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