At a Glance
- SKU: MD9005W-LOTOF2
PRODUCT INFORMATION
Product Details
TRAILER WHEEL & HUB ACCESSORIES
3.125" White Plastic Trailer Hub Cap Covers - Set of 2
Precision-engineered press-fit bearing protection. Please verify your center bore is 3.125" (Common for 5-Lug) and not 4.25" (Common for 6-Lug) before ordering.
Part Number: MD9004W-LOTOF2 Fits 3.125" Hub Openings 3.25" Overall Height
Overview
This set of two 3.125" white plastic trailer hub cap covers is a direct replacement for SKU MD9004W. Designed for a friction-fit installation, these covers provide a clean, finished appearance while sealing your wheel's center bore from road grime and saltwater. Note: This cap is specifically sized for a **3.125" pilot hole** (bore opening), typically found on 5-lug utility and boat trailer wheels.
R&P Service Insight
The "3.125 vs 4.25" confusion is common. Here is the rule of thumb for R&P customers:
- 3.125" (This Product): Fits the center hole of most **5-Lug** trailer wheels.
- 4.25" (Do Not Order): Fits the larger center hole of **6-Lug** trailer wheels.
- Measurement: Always measure the hole in the wheel, not the outer decorative lip of an old cap.
R&P Knowledge Hub
Compatibility: Nominal 3.125" diameter press-fit center bores.
Vehicle / System Fit: Travel trailers, campers, and boat trailers using standard 5-lug axle configurations.
Installation Notes: Measure the center bore of your rim with a caliper. If it measures 4.25", this cap will fall through the opening.
Performance Insight: Unlike chrome-plated steel, this UV-stabilized plastic will never rust, flake, or pit, even in high-salt marine applications.
R&P Repair Insight
Proper fitment is the difference between a clean trailer and a lost cap on the highway. Before you press these in, check your clearances:
- Internal Height: This cap provides **3.25"** of total height. Ensure your grease caps or bearing protectors don't stick out further than 3".
- Bore Prep: Clean the wheel's center bore of any rust or old grease to ensure the plastic ribs "bite" into the rim for a secure fit.
- Installation: Use a rubber mallet or the palm of your hand. Avoid using a metal hammer which can crack the plastic.
Features
Exact 3.125" Barrel
Sized specifically for 5-on-4.5" and other 5-lug trailer wheel center bores.
Complete Pair
Includes two (2) white plastic hub covers to service one full axle.
Zero-Corrosion
Durable white plastic construction is 100% rust-proof and saltwater safe.
High Clearance
3.25" overall height provides room for standard dust caps and bearing protectors.
Specifications
| Specification | Detail |
|---|---|
| Part Number | MD9004W-LOTOF2 |
| Bore Opening Size | 3.125" (3-1/8") |
| Overall Height | 3.25" |
| Material | UV-Resistant White Plastic |
| Mounting Style | Press-In / Friction Fit |
| Application | Trailer Axle Hubs |
Fitment / Application
| Category | Details |
|---|---|
| Primary Fit | 5-Lug Trailer Wheels |
| Common Brands | Travel Trailers, Campers, RVs |
| Measurement Note | Does NOT fit 4.25" bores (6-Lug Wheels) |
| Quantity | Set of 2 Caps |
Final Measurement Note: Please verify your wheel center bore is exactly 3.125". If you have a 4.25" opening, this cap is too small. If you have a 3.19" opening, this cap may fit loosely.
MD9004W white trailer hub cap 3.125 inch center cap plastic axle cover boat trailer wheel cap utility trailer dust cover vs 4.25 hub cap
Related Parts & Kits
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