What It Is And What It Fits
This is a hub cap for trailer axles, not a drive axle hub cap, so don't try to swap it onto a tractor's rear end. It covers the hub bore where the axle spindle nut and bearings sit, keeping lubricant contained on standard trailer axle setups.
Fitment comes down to the hub bore diameter and how the cap seats or bolts on, not the axle brand itself. Most trailer manufacturers used a handful of common hub sizes, which is why one cap number can cross to several trailers built by different OEMs over the years.
Check your old cap for a cast-in number or measure the outside diameter before ordering. If the old one is worn smooth or missing entirely, pull the number off the hub itself or check your trailer's axle tag.
Why These Numbers Cross
343-4009, 3434009, 921010009, and A13262C133 all reference the same physical cap dimensions and mounting style. Different suppliers and OEMs relabel the same casting, which is normal in this corner of the parts business — you'll see this with 363-4009, 364-4009, and 340-4009 too, since they're often just sequential part numbers for closely related cap sizes.
The catch is these numbers aren't always interchangeable one-for-one. A 363 or 364 series cap might be a slightly different bore or depth made for a different hub design. Don't assume because the last four digits look similar that it's a drop-in.
Rule of thumb: match by the number stamped on your failed cap first. If that number isn't listed, measure the hub opening and compare to the specs on file rather than guessing off a similar-looking part number.
Ordering From PartStop
We stock 343-4009 and the common crosses at our Tacoma counter, same-day pickup if you call ahead, and we ship nationwide if you're not local. At $19.99 it's cheap insurance against losing grease on a long haul.
Every hub cap we sell carries a 6+ month warranty, standard aftermarket coverage, no hassle if it's defective out of the box.
If you're not 100% sure on the number, snap a photo of the old cap or the hub and send it over. Cheaper to double check than to make two trips.
343-4009 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 343-4009. 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 | A13262C133, 363-4009, 364-4009, 340-4009, A3262C133 |
Frequently asked questions
Does 343-4009 fit my trailer axle?
Likely, if your old cap is stamped 3434009, 921010009, or A13262C133, but confirm by matching the number on your old part or measuring the hub bore before you order. Trailer hub sizes aren't universal across all brands.
Is this the same as the A13262C133 cap?
Yes, A13262C133 is one of the cross-reference numbers for this same hub cap. Different suppliers stamp their own part numbers on what's physically the same casting, but confirm your VIN or old part number to be sure.
What's the difference between this and the 363-4009 or 364-4009 versions?
They're closely related but not guaranteed identical — different bore depth or diameter in some cases. Match against your old cap's number first, and if you're unsure, give us a call with your trailer's axle info and we'll verify before you order.
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.