HOW TO MEASURE GREASE CAP?

wnjj wrote:
If you're going to measure anything, measure the hub not the cap. The cap is slightly oversize and may not be perfectly round.

x2, and if you have Dexter axles and spindles you can easily look up the part number for the cap for your hub and find the specs that way. Also, most decent RV parts stores and even Camping World stock those caps so you can just take one in and match it up.

If you're going to measure anything, measure the hub not the cap. The cap is slightly oversize and may not be perfectly round.

Why measure at all? Take the existing cap(s) to your friendly local auto parts store and match it like and kind. No rocket science necessary! The caps are very common items.

Chum lee

That link is a bit confusing though because he lists three sizes (2 of which are so close I can't see they matter) but the ad below is even different than that.

Most places seem to call them 1.98". I'm thinking the hub is 1.98" and extra few thousandths is just to ensure a tight fit.

https://www.cerka.ca/dust-caps-chart

Oasisbob wrote:
I want to order new grease cap for the axle of my trailer. The cap fits inside a pocket covering the axle nut. Wo I measured the outer diameter of the one cap I have and it is 2.045. I see no caps that size so I must be measuring in the wrong place. Where do I measure? Thanks

It seems there are 1.986" caps. I'd guess yours is probably that one since the next size up are too big.

https://www.etrailer.com/question-4149.html