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USA Leaf springs and part numbers for trucks and trailers.
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For the trucks that keep America moving

1-877-587-9888

Leaf spring guides

How to identify a leaf spring

Three ways to pin down the exact spring on your truck, in order of reliability. Once you have a number, search our catalog. We cross-reference OEM and SRI numbers on every part we make.

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Method 1

Get the OEM number from your VIN

The most reliable route, and it requires no crawling under the truck.

Call a dealer with your VIN and ask for the leaf spring part number. If you have the truck build sheet (the line setting sheet on commercial trucks), the front and rear spring numbers are usually listed on it.

With that number in hand, search it in our catalog. We list the OEM cross-reference on each part page, so the OEM number leads you straight to the APM part that replaces it.

Method 2

Find the number stamped on the spring

Most springs carry a stamped number. Where it hides depends on the spring type.

Engineering side view of a multi-leaf spring with five numbered markers on the common stamp locations: 1 the spring clip, 2 the end of the shortest leaf, 3 the underside beside the center bolt, 4 the main leaf near the eye, and 5 the wrapper end beside the eye.
The five numbered points are where a part number hides on a multi-leaf spring. Check them in order; number 1, the clip, pays off most often.
  • Multi-leaf springs: check the side, top, or bottom of the clip first. Also try the end of the shortest leaf, or the bottom of the last leaf beside the center bolt. That last one is sometimes hidden until the spring comes off the truck.
  • Full taper springs: the end of the leaf, the end of the wrapper, or the clip.
  • Trailer springs: the outside of the hook.
Three leaf spring types side by side: a multi-leaf pack with stacked leaves and clips, a full taper spring with two thick tapered leaves, and a short three-leaf trailer spring with an open hook end.
Left to right: multi-leaf, full taper, and trailer spring. Knowing which one you have tells you where to look for the stamping.

One Ford quirk worth knowing: Ford often stamps only the prefix and suffix, so the stamping will not match a full part number search. The missing middle section is the position code. 5560 means a rear spring, 5310 a front spring, 5588 a helper. If your stamping reads something like D7HT...AUA, try searching the pieces you have, or send it to us and we will match it.

Method 3

Identify by vehicle and measurements

No number anywhere? Measurements settle it.

Start with year, make, and model. Then confirm with the physical spring, because the same truck can ship with several spring options at different capacities. The measurements that matter:

  • Number of leaves
  • Length, measured eye to eye along the main leaf
  • Leaf width and thickness
  • Eye type and bushing dimensions
APM USA measurement guide for a multi-leaf spring showing lettered callouts: L for overall length, La and Lb for each side from the eye to the center bolt, C for camber, eye diameter, and W for leaf width.
The measurement callouts we use across the catalog: L is overall length, La and Lb run from each eye to the center bolt, C is camber, plus eye diameter and leaf width. Every part page shows these same letters with the actual values for that spring.

Every part page in our catalog lists these measurements, so you can compare what is on your truck against what we build. If the numbers are close but not exact, ask us before ordering. Springs are not a part where close enough is good enough.

Have a number? Search it.

Our search takes APM part numbers, OEM numbers, and SRI numbers. We manufacture these springs, so the cross-reference data comes from our own engineering records, not a reseller database.

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