What You're Actually Buying
This is a left or right hand S-cam, 16.5 inches long, built for 16.5" brake drums running the common 10/28 spline pattern — 10 splines where it meets the cam bushing/head, 28 splines where the slack adjuster clamps on. That combo shows up all over Fruehauf, Wabash, Trailmobile, Great Dane and most other van/reefer/flatbed trailer axles built in the last 30-plus years.
LH and RH matter here — the cam profile is directional, so don't just grab whichever one's on the shelf. Pull the old cam and check which side of the trailer it came off, or check your axle tag/build sheet before you order.
At $10.99 this isn't a part you agonize over, but it does need to be the right length and spline count or you'll be pulling the brake chamber and slack adjuster back off five minutes after you bolted it up.
Why All These Numbers Cross
E9731 is the base number, and E1424A (Euclid) is essentially the same shaft under a different label — Euclid's been a major OEM supplier to trailer builders for decades, so a lot of their cam numbers run parallel to the generic aftermarket ones like this.
Torque Parts (CS41507, CS41414), Meritor (R607227) and Haldex (04-572041) all show up here too because S-cams are a pretty standardized commodity part across brands once you match length, spline count, and hand. The physical dimensions — cam head diameter, spline depth, overall length — are what actually determine fit, not whose name is stamped on the box.
The one thing that trips guys up: some of these numbers cover both LH and RH versions, others don't. Confirm you're ordering the correct hand version off whichever cross number you're working from, and always measure your old cam's length and spline count against spec before assuming a swap number is a straight bolt-in.
Ordering From PartStop
We keep these in stock at the Tacoma counter — if you're local, call ahead and it'll be sitting up front by the time you get here. Otherwise it ships out same day for most orders placed before mid-afternoon, nationwide.
Comes with our standard 6+ month warranty. If it's the wrong length or spline count, that's on us to make right — just don't wait three months to tell us if it feels off when you're installing it.
Rule of thumb: bring in the old cam, or at least have the axle tag number and VIN handy when you call. Trailer axle specs vary enough between builders that matching your old part physically beats guessing off a paint code or trailer age every time.
E9731 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to E9731. 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 |
|---|---|
| Euclid | E1424A |
| Torque Parts | CS41507, CS41414 |
| Meritor | R607227 |
| Haldex | 04-572041 |
| Aftermarket | R607081 |
Frequently asked questions
Does E9731 fit my 2015 Wabash reefer trailer?
Probably, if it's running 16.5" drums with the 10/28 spline setup, which is common on that era Wabash. But 'probably' isn't good enough for a brake job — pull the old cam, check the spline count and overall length, or give us the axle tag number off the trailer and we'll confirm before you order.
Is this the same as the Euclid E1424A?
Functionally yes — same length, same spline pattern, same intended fit. Euclid supplies OE and aftermarket for a lot of trailer builders, so their number often parallels a generic cross like E9731. Still worth double-checking hand (LH/RH) since that's where mix-ups happen, not the base spec.
How do I know if I need the 10/28 spline version and not something else?
Count the splines on your old cam — 10 splines at the cam bushing end, 28 at the slack adjuster end is what this part covers. If your trailer's got a different spline count or the cam length isn't 16.5", this isn't your part. When in doubt, bring the old shaft in and we'll match it up on the spot.
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.