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Which Seal Goes with a Trailer Hub that Takes 15123 and 25580 Bearings  

Published 05/21/2014



Question:

we need to replace trailer bearings and seals with the numbers outer 15123 and inner 25580 the only numbers that are on the seal are 55 85.6 12 are you able to identify which one of your seals this would be? It is rubber cast over metal.

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Expert Reply:

The only way to know for sure which seal you need is to measure the inner diameter with a set of dial or digital caliper. The issue is, which you may have already determined, is that the inner and outer bearing numbers that you have are associated with hubs that will either take seal # RG06-070 with inner diameter of 2.25 inches or seal # RG06-090 which has a 2.125 inch inner diameter.

You can also measure the spindle where the seal goes using the calipers. measuring the spindle will actually be more accurate since the seal material can flex and throw off the measurement.

The numbers on the seal I think are measurements in millimeters. the 85.6 would be 3.37 inches which is the outer diameter of both seals. But it gets more confusing because if you converter the inches to millimeters you end up in between 2.125 and 2.25 inches. Measuring with the calipers is the way to go.

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Michael H
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