Metalworking tools use springs to hold, strip, clamp and return. The workhorse is the die spring in stamping and forming dies; machine tools add disc spring stacks and wave springs for clamping and preload. We have supplied fixture clamping springs, and we make die, disc, wave and compression springs to your drawing or sample. The sections below explain how to specify them for a tool.
Key Takeaways
- Die spring life depends mainly on how far the spring is compressed relative to its free length, so the review starts with installed height and stroke.
- Die spring colors indicate load class, but color schemes differ between standards and suppliers; the drawing, not the color, defines the spring.
- Springs that share one stripper plate should be replaced as a set.
- We produce wire diameters from 0.1 mm to 80 mm, respond to drawings within 24 hours, and are certified to ISO 9001 and IATF 16949.
Which springs metalworking uses and why
Die springs in stamping and forming dies
A die spring is a heavy compression spring, usually wound from rectangular or shaped wire. A rectangular section puts more steel into the same coil diameter than round wire, so it delivers more force in a pocket whose size is already fixed by the die design.
In the tool, the spring is preloaded at installed height, then compressed further on every press stroke. Stress rises with total deflection, so the deeper it goes, the fewer strokes it survives. Die spring makers usually publish recommended maximum deflections by load class, so the allowable deflection for your spring is confirmed at review rather than assumed.
Guide each die spring on a rod or in a pocket with the recommended clearance to prevent buckling (the outside diameter grows slightly as it compresses), and replace springs that work together as a set. A mix of new and fatigued springs tilts the stripper plate.
Compression springs in fixtures and ejectors
Where loads are lighter, standard round-wire compression springs handle pilots, knockouts, ejector pins and clamp returns in jigs and welding fixtures.
Disc and wave springs in machine tools
Disc springs deliver high force in very short axial height, which is why stacks of them are used to clamp tools in many spindle drawbars. Wave springs provide axial preload where a coil spring would be too tall.
Choosing material and finish for press shops and machining areas
| Option | Where it fits | What to weigh |
|---|---|---|
| Alloy spring steel | Die springs and disc springs under high load | Standard choice for heavy, high-stress tooling springs |
| Silicon-chrome spring steel | Die springs with deep deflection or warm tools | Higher fatigue strength and better resistance to relaxation at moderate heat |
| Oil-tempered wire | Heavier general compression springs | Economical for larger wire sizes |
| Carbon spring wire | Light fixture and ejector springs | Economical; oiled or plated against rust |
| Stainless steel 304 | Springs splashed by water-based coolant | Corrosion resistance at lower strength |
| Color coating or plain oiled | Die springs | Color identifies load class; oil protects in storage |
What to send for an engineering review
- Pocket diameter and guide rod diameter.
- Free length available and installed height.
- Working stroke and the force needed per spring at installed height and at full stroke.
- Number of springs per tool and expected press speed.
- The catalog number or a sample of the spring you use now, if you are replacing one.
- Any color or load-class convention your tool room follows.
For more parameter guidance, read how to specify a custom compression spring.
Frequently asked questions
Can you match die springs from another supplier?
We can work from a physical sample or a drawing. Send the spring or its dimensions and load data, and we confirm manufacturability before quoting.
Do you make small batches for tool builds?
Yes. There is no fixed MOQ; small batches and high-volume runs are both supported.
What files can we send?
DWG, DXF, STEP, PDF, JPG or PNG, or a sample spring or catalog number of the spring you use now.
Send your tool data or a sample spring through our contact page for an engineering review.
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