Double Lip Grease Seal Replacement for National 7781S

Question

Question:

Hi do you have a double lip seal that would cross from a national 7781s which is a single lip. Thanks

asked by: Ray S

0

Expert Reply:

Hey Ray!

I was able to find your National 7781S seal is a single-lip oil and grease seal with a 1.987" outer diameter. TruRyde Grease Seals (pair) # RG06-020 is a double lip seal with a 1.987" outer diameter, but it's specifically a grease seal and not an oil seal so as long as your axle is setup for grease, you'll be good to go. These come in pairs, so if you're wanting to cover a tandem axle setup, you'll only need to purchase a quantity of 2 instead of 4.

Is your setup an oil bath setup or grease? What kind of trailer are you putting these on?

expert reply by: Jerry B

0

Ray S.

6/24/2026

Hi Jerry, I have ordered your 34823 seal will this work instead of the rg06-020 you suggested. I didn't hear back so jumped the gun and ordered, I should have waited for your reply. The axel is set up for grease. thanks

Jerry B.

6/25/2026

@RayS The outer diameters of the two are nearly identical, with them being 0.004" apart from each other, but the Double Lip Grease Seal - ID 1.249" / OD 1.983" - Qty 1 # 34823 is slightly different because the inner diameter is 1-1/4" while the inner diameter of Grease Seals (pair) # RG06-020 is 1-1/2". This will make a difference of how it fits on your axle, as well as how it seals so I think you should go with the # RG06-020.

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Double Lip Grease Seal Replacement for National 7781S

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