What is the Difference Between the 10-10 Grease Seals and the 10-36 Grease Seals

Question:

What is the difference between a 10-10 grease seal and a 10-36 seal? I see a lot of the bearing replacement packs are exactly the same, just the grease seal is different. Thanks

asked by: Luke

Helpful Expert Reply:

The difference between the 10-10 grease seals, # RG06-090, and the 10-36 grease seals, # RG06-070, is their inner diameter. The 10-10 grease seals fit older spindles with a seal journal (see photo) diameter of 2.125 inches. The 10-36 grease seals fit newer spindles with a seal journal of 2.250 inches. On 5,200 lb, 6,000 lb and 7,000 lb axles, manufacturers are no longer making spindles with a 2.125 inch seal journal, so they needed to come up with a seal that could fit the slightly larger seal journals. The inner and outer bearing journals remained the same, which is why you see the same bearing numbers.

To identify which grease seal you will need, I recommend using a precise measuring tool such as a dial caliper to measure the grease seal journal on your spindle.

expert reply by: John H

click to enlarge

John J.

3/23/2020

When did the transition from 2.125 to 2.25 take place?I have 2 trailers with Al-Ko 5200lb axles, both built in 2011. One uses 10-10, but I cannot measure the other one right now.

Chris R.

3/23/2020

I couldn't find an exact year that the 2.125" grease seals starting being phased out on those higher-rated axles, but most likely if one of your trailers uses the # 10-10 seal, the other, which was made in the same year, uses it as well. Of course the only way to verify this would be to pull the hub and check when you are able.