What This Cap Fits
This is a hub cap side cover, not a full hub assembly — it bolts or presses onto the outer end of a trailer's spoke wheel hub, sealing off the grease chamber. You'll find these across a wide range of trailer axles from the usual suspects — Fruehauf, Great Dane, Wabash, Utility, and generic aftermarket trailer builds using common wheel-end setups.
The 343-4075 number and its cousins (15556130, 3434075, 7003942) all point to the same basic cap dimension and bolt pattern used across a chunk of the trailer fleet built from the 80s through today. That's why one part number covers so many trailer brands — the wheel-end hardware got standardized a long time ago and never really changed.
Why These Numbers Cross
Cross-referencing hub caps comes down to three things: outside diameter of the cap, the bolt or clamp pattern, and whether it's a plain cap or one with a grease fill plug. The numbers in our table — 340-4075, WA343-4075, WA14-5053, H84075, and the Stemco STM343-4075 — all share those same dimensions, which is why they interchange with the 343-4075.
Where guys get burned is assuming any hub cap fits any hub. It doesn't. Different hub manufacturers used slightly different cap diameters and different numbers of mounting holes, and some caps have a fill plug while others don't. If your old cap has a plug hole and the new one doesn't, that's a problem come service time.
Rule of thumb: pull the old cap off, read whatever number is stamped or cast into it, and match that against what's listed here. If it's worn smooth, measure the outside diameter and count the bolt holes before you order.
Ordering From PartStop
We keep 343-4075 and its cross numbers in stock at our Tacoma counter — walk in, we'll match it against your old cap right there, and you're back on the road same day. If you're not local, we ship nationwide and get these out fast since it's a small, easy part to box up.
Every hub cap we sell carries our 6+ month warranty. If it doesn't fit or fails early, bring it back or call us — we'll sort it out. Just confirm the number off your old part or check your trailer's axle/hub spec by VIN before you order, since we can't guarantee fit sight unseen.
343-4075 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 343-4075. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Cross-Reference | 340-4075, WA343-4075, WA14-5053, H84075 |
| Stemco | STM343-4075 |
Frequently asked questions
Does 343-4075 fit my Great Dane trailer?
Probably, if your hub uses that same cap diameter and bolt pattern — but Great Dane trailers came with a few different axle suppliers over the years. Check the number cast into your old cap or measure it before ordering to be sure.
Is this the same as the Stemco STM343-4075?
They cross-reference to the same fit and dimensions, yes. Stemco just puts their own part number on it. Functionally you're looking at the same cap, but always double check your old part's number against ours before buying.
My old cap doesn't have any numbers on it — now what?
Common problem, they wear smooth or get painted over. Measure the outside diameter, count the mounting holes, and check if there's a grease fill plug. Bring it into the Tacoma store if you can — we can usually match it up in person faster than trying to do it over the phone.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.