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When standard springs fail under repeated load cycles, engineers and toolmakers turn to heavy-duty compression die springs. Whether you are building a stamping die, a hydraulic press fixture, or a precision jig, undersized springs cause premature fatigue, inconsistent return force, and costly downtime. These Ø25/27mm compression die springs are engineered for heavy-load industrial and workshop applications where consistent spring force and long service life are non-negotiable.
Each spring features an outer diameter (OD) of either 25 mm (~0.98 in) or 27 mm (~1.06 in), with an inner diameter (ID) of 12.5 mm (~0.49 in) or 13.5 mm (~0.53 in) respectively. Available lengths range from 20 mm (~0.79 in) up to 300 mm (~11.81 in), covering a wide spectrum of stroke and travel requirements. Springs are available in five color-coded load grades — Yellow, Blue, Red, Green, and Brown — allowing quick visual identification of spring rate on the shop floor.
Typical use cases include metal stamping and punching dies requiring consistent ejector return force, hydraulic and pneumatic fixture clamping systems, precision mold tooling for plastic injection and die casting, and heavy-duty mechanical assemblies in agricultural or construction equipment maintenance. Long-tail applications include replacement compression springs for industrial press brakes, CNC fixture springs, and coil spring substitutes in custom fabrication jigs.
Five distinct colors (Yellow, Blue, Red, Green, Brown) correspond to different spring rates, enabling instant visual identification and reducing assembly errors in multi-spring tooling setups.
OD 25 mm (ID 12.5 mm) and OD 27 mm (ID 13.5 mm) cover the most common heavy-duty die spring pocket sizes, providing a direct fit without custom machining.
Available in incremental lengths from 20 mm up to 300 mm (~0.79–11.81 in), accommodating varied stroke requirements across stamping, clamping, and ejection applications.
Engineered for heavy-load duty cycles with higher spring rates than light or medium grades, delivering firm, consistent return force under sustained compression in demanding tooling environments.
Tightly wound coils maintain consistent pitch and parallelism across the full compression range, ensuring square seating in die pockets and reducing lateral deflection under load.
Designed to withstand high-cycle stamping and pressing operations, these springs maintain their rated load characteristics over extended service intervals, reducing replacement frequency in production tooling.
| Outer Diameter (OD) | 25 mm (~0.98 in) / 27 mm (~1.06 in) |
|---|---|
| Inner Diameter (ID) | 12.5 mm (~0.49 in) / 13.5 mm (~0.53 in) |
| Available Free Lengths | 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 125, 150, 175, 200, 250, 300 mm |
| Load Grade / Color | Yellow / Blue / Red / Green / Brown (see variant options) |
| Spring Rate | See variant options |
| Duty Rating | Heavy Load |
| Spring Type | Compression Die Spring |
| Coil Direction | Right-hand wound (standard) |
| End Type | Closed and ground ends |
| Material | Alloy spring steel |
| Surface Finish | Color-coated per load grade |
| Packing Quantity | 1 pc per unit |
Measure the depth of your die spring pocket or the required travel distance. The free length of the spring should be long enough to provide the desired working stroke while remaining within the recommended compression ratio (typically no more than 30–40% of free length for heavy-duty grades). Select a free length that gives you adequate preload and full stroke without bottoming out.
The color identifies the load grade and spring rate category. In standard die spring classifications, Yellow typically indicates light load, Blue indicates medium load, Red indicates heavy load, Green indicates extra-heavy load, and Brown indicates ultra-heavy load. Always verify the specific spring rate for your chosen variant before use in load-critical applications.
These springs are manufactured from alloy spring steel with a color-coated surface finish. The coating provides a degree of corrosion resistance for typical workshop and tooling environments. For highly corrosive or outdoor applications involving moisture, chemicals, or salt exposure, additional protective measures or stainless steel alternatives should be considered.
The OD 25 mm series has an inner diameter of 12.5 mm and fits die pockets bored to 25 mm. The OD 27 mm series has an inner diameter of 13.5 mm and fits 27 mm pockets. Both are heavy-load duty springs but are dimensionally distinct — always match the spring OD to your pocket bore and the ID to your guide pin diameter to ensure proper seating and alignment.
Yes, provided the OD, ID, free length, and load grade match your existing spring specifications. Cross-reference the color code and dimensions with your original spring data sheet. If the original spring rate is unknown, measure the pocket diameter and guide pin diameter, then select the matching OD/ID combination and the appropriate load grade color for your application.
Heavy-duty compression die springs are designed for high-cycle tooling applications. Expected service life depends on the compression ratio used per cycle — operating within the recommended deflection range (typically 20–30% of free length) significantly extends fatigue life. For production stamping dies, inspect springs periodically for set (permanent length reduction) and replace when free length has decreased noticeably or spring force feels inconsistent.
For best performance and to prevent lateral buckling under load, it is recommended to use these springs with a guide pin through the ID or within a close-fitting housing bore. The ID of 12.5 mm (OD 25 series) or 13.5 mm (OD 27 series) accommodates standard guide pin diameters. Unsupported springs under heavy loads may deflect laterally, reducing accuracy and service life.
