Trailer Hub Dust Cap with a 2.125" Outside Diameter
Updated 10/06/2025 | Published 06/08/2020
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Question:
I have a hub that needs a dust cap. I measured with a ruler and the best I can tell the measurement from inside the hub is 2-1/8 inches. Could you tell me which size I need to order. The other hub is a smaller size. Weird.
asked by: Chris S
Helpful Expert Reply:
I have a couple close but not perfect to your measurements. The 2" Lubed Dust Cap & Rubber Plug - 1.99" part # DC200L-DCRP is an extremely common cap size found on a lot of trailers. Sometimes the hub will have a small bevel on them that could easily be 1/16" on each side getting us to the 2 1/8" or I have the larger Zinc Plated Grease Cap - 2.333" Outer Diameter part # TRDC-233 but with this one we are looking at it being almost 1/4" too big. I think that will cause issues with installation. When we get these measurements we use a set of dial calipers and measure inside of the bore about an inch. I really think that the first option is what you're after just take another quick look at it and see if it might be the bevel causing the measurement to be a little big.
Product Page this Question was Asked From
2" Lubed Dust Cap & Rubber Plug - 1.99" x 1.40" x 1.18" - Qty 1
- Trailer Bearings Races Seals Caps
- Caps
- EZ Lube Grease Cap
- 1.98 Inch O.D.
- 1.99 Inch
- 2000 lbs Axle
- 2200 lbs Axle
- 2500 lbs Axle
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- 3500 lbs Axle
- TruRyde
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Jeff
10/4/2025
I have measured my axle hub and a dust cap from the other side and both measure 2.12 inches or 2 1/8 inch’s so where do I get dust caps that size