What This Air Spring Is
This is a two-lobe rubber bellows — a double convoluted bag — that carries trailer axle load and takes road input out of the frame. Plate and piston diameter is 9.00 in. Collapsed height runs about 3.4 in, extended height about 11.0 in. Weight is roughly 12.6 lb. Air inlet is 1/4 NPT.
Double convoluted bags are used where you need a lot of load capacity in a short stroke, which is why they show up on trailer suspensions and on auxiliary lift axles. The two lobes let the bag squat down flat when the lift axle is raised and dumped, then push back up to ride height without the bellows folding over on itself.
Position matters when you order. This part is called out for trailer and auxiliary (lift) axle suspension positions. Tractor cab and seat bags are a different animal even when the bag looks similar in a photo, so confirm what the bag is doing on the unit before you match on shape alone.
Why These Numbers Cross
Air springs are built to a standard bellows geometry. A style 22 double convoluted bag has a defined plate diameter, bead ring, convolution count and stroke range. Any manufacturer building to that same envelope produces a physically interchangeable part, which is why the same bag carries a different number at every supplier and every suspension builder.
W01-358-7424 is the Firestone-style catalogue number for that geometry. Goodyear lists the same envelope as 2B12-300 — the "2B12" reads as two-bellows, 12 in nominal. ContiTech carries it as 64283 with the engineering call-out FD 330-22 327. Those three are the component-manufacturer numbers for the same bag.
The rest are suspension-builder numbers. Hendrickson trailer applications call it S-13043. SAF-Holland lists 90557014 and Neway TC1442. Ridewell uses 1003587424C — note the Firestone digits buried in it. Watson & Chalin lists AS-0009. All of those service the same style 22 bag. They are printed here for identification only; PartStop is not affiliated with or authorised by any of these manufacturers.
Check Before You Order
Pull the old bag and read the bead plate. The number is stamped or moulded there, and that number beats any parts book. If the plate is corroded, wire-brush it before you give up. Then measure: plate diameter across the top, and ride height from the bead plate face to the piston face with the trailer aired up.
Look at the mounting hardware. Double convoluted bags of the same size can differ in stud pattern, air port position and whether the bottom is a stud mount or a blind-nut piston. Compare the old bag's top studs and bottom fastener side by side with the replacement before you hang it on the axle.
Cross-reference is a starting point, not a fitment promise. Confirm by VIN or by the number on the part you removed. When you install, air the bag up before torquing the lower fastener so the bellows seats without a twist, and check that nothing rubs the bag at full jounce or at full lift-axle raise.
W01-358-7424 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W01-358-7424. 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 |
|---|---|
| ContiTech | 64283, FD 330-22 327 |
| Goodyear | 2B12-300 |
| Hendrickson | S-13043 |
| Neway | TC1442 |
| Ridewell | 1003587424C |
| SAF-Holland | 90557014 |
| Watson & Chalin | AS-0009 |
Frequently asked questions
How do I know if my air bag is bad or just leaking at the fitting?
Air the trailer up, shut it down and spray soapy water on the fitting, the bead plate seam and the whole bellows. Fitting leaks bubble at the threads and usually fix with tape and a retorque. Bellows leaks bubble along a crease or a rub mark and mean the bag is done. Any bag showing cracked rubber, a rub-through spot or a folded-over lobe should be replaced regardless of whether it holds air today.
Do I have to replace air springs in pairs on a trailer axle?
It is good practice. A new bag and an old bag on the same axle sit at slightly different heights and load the axle unevenly, and the old one is usually not far behind. If the second bag is the same age and has been running the same miles, change both while the trailer is already in the air.
Will this bag work on a lift axle that dumps completely?
Double convoluted bags are designed for that duty and this part is listed for trailer auxiliary lift-axle positions. What matters is that the collapsed height of the bag clears everything when the axle is fully raised and the bag is fully dumped. Measure your collapsed clearance and compare it against the roughly 3.4 in collapsed height, and confirm the number on your old bag before ordering.
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