Trailer Hub Dust Cap with a 2.125" Outside Diameter
Updated 10/06/2025 | Published 06/08/2020
Products Featured in This Question
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
- 3000 lbs Axle
- 3500 lbs Axle
- TruRyde
more information >
Continue Researching
- Search Results: timken 25580
- Search Results: timken 14125a
- Search Results: trailer wiring
- Search Results: camper door latch
- Search Results: square gooseneck coupler
- Shop: Trailer Wiring
- Search Results: 8~285~10
- Search Results: reese sway control
- Shop: Trailer Hitch
- Shop: TowSmart Trailer Connector - 2-Wire Flat Set - 12" Long
- Shop: Shocker Sway Control Friction Arm Bar Kit For Trailers Over 10,000 lbs - 2 Arm Kit
- Shop: Phoenix USA QuickTrim Ring Cover for 16" Trailer Wheels - 8 on 6-1/2 - Chrome ABS - Qty 1
- Shop: Zinc Plated Grease Cap - 2.333" Outer Diameter - 1.00" Tall - Drive In
- Video: Curt Trailer Hitch Complete Installation - 2024 Nissan Pathfinder
- Shop: Replacement Bearing Buddy Bras - Model 19B - (Pair)
- Shop: Furrion Vision S Wireless RV Backup Camera System w/ Night Vision - Rear Mount - 5" Screen
- Shop: TowSmart Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Q&A: Bearing Buddy Dust Covers for Bearing Buddy with 2.125" Outer Diameter
- Shop: Brake Controller
- Shop: Vehicle Tow Bar Brake System
- Shop: Vehicle Tow Bar Wiring
- Shop: Base Plate for Tow Bar
- Q&A: Idler Hub To Replace TDE 46245 Hub and Rotor On Boat Trailer
- Q&A: Replacement Hub/Rotor and Bearings for Tie Down Engineering TDE46245
- Q&A: Replacement for Dexter Mobile Home Axle Grease Seal 10-41
- Q&A: 2.24" Grease Cap Replacement
- Video: Hands-On with the 25 Ft 4-Way Trailer Wiring Harness
- Q&A: Looking for Grease Cap With OD Slightly Larger than 1.98 Inches
- Q&A: Need Bearing Buddy for 2-1/8 Inch Diameter Trailer Hub Bore
- Article: How to Tell the Weight Rating of a Trailer Axle
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