Custom vs Stock Springs

Custom vs. Stock Springs: What’s the Difference?

At Ace Wire Spring & Form Co., Inc., we specialize in manufacturing custom springs and wire forms tailored to meet exact specifications—not off-the-shelf solutions. However, we frequently receive inquiries referencing stock spring part numbers. While we can quote or manufacture to those specifications, it’s important to understand the distinction and what we require to move forward.

While we do not carry or resell stock spring inventory, our team can often manufacture a spring that matches a stock part number. To do so, we require more than just a catalog or stock number—we need a complete technical drawing or full specifications to ensure we’re quoting accurately and building a spring that performs exactly as intended.

Why We Manufacture Custom Springs

Critical applications—such as those found in the medical, defense, energy, and industrial sectors—demand components that meet tight tolerances and deliver consistent, reliable performance under load. Off-the-shelf stock springs simply aren’t engineered for this level of precision. We manufacture custom springs to fit your exact needs; this approach offers key benefits such as:

• Engineered to Spec: Every spring is made to your exact dimensions, tolerances, and performance requirements.

• Consistency Under Load: Custom springs are less likely to deform, shift, or cause premature wear in assemblies.

• Application-Specific Materials: We help select the right material for the environment and stress conditions.

• Design Support: While we don’t “design” products per ITAR and ISO standards, our team offers decades of experience and can suggest improvements or confirm manufacturability.

Need a Quote Based on a Part Number?

If you’re referencing a stock part number, we’re happy to help—but please provide a technical drawing, material requirements, and any relevant application data. This allows us to quote confidently and match performance expectations.

To receive a quotation, please fill out our Request for Quote Form.