How to Determine Correct Replacement Grease Seal for 44251

Updated 05/01/2020 | Published 04/29/2020

Question:

replaced bearings on my trailer. Both sides have a sleeve made for seal surface.the seal number that was on the seal is 44251. In this vast wasteland called Utah, NOBODY has that seal.What say you????? bearings used were-Inner L68111 and L68149 Outer L44610 and L44649 #4 sombody looked up that number and gave me a National # 471801 but no body had that seal to check either.........................HELP

asked by: Chris O

Helpful Expert Reply:

The only reference I could find to a 44251 is that it is a "vintage" seal and there were no dimensions given, and the National 471801 seal seems to be an automotive seal that does not match any dimensions of trailer grease seals.

The bearing numbers you gave are consistent with a 3,500 lb axle so they make sense but there really is only one way to definitively determine the right grease seal for your trailer. What you will have to do is use digital caliper and measure your spindle to the thousandths of an inch where grease seal rides.

This will give you the inner diameter, which you can then match up with the right seal. I have added a link to our entire selection of seals for you to come back to once you know the diameter (you can filter your selection by diameter), as well as some help articles on bearings and seals.

expert reply by: Kyle S