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When a standard spring simply won't hold up under repeated stress, engineers, machinists, and serious DIYers reach for a heavy load compression die spring. Whether you're rebuilding a press tool, designing a custom fixture, or replacing a worn-out spring in industrial equipment, getting the wrong spring means downtime, failed assemblies, and wasted effort. These heavy load duty compression die springs are engineered to deliver consistent, repeatable force across thousands of cycles.
Each spring features an outer diameter of 25mm (approximately 0.98 in) and is available in inner diameters ranging from 13.1mm to 13.9mm (approximately 0.52–0.55 in), depending on the color variant selected. Lengths range from 20mm to 300mm (approximately 0.79 in to 11.81 in), giving you the flexibility to match the exact free length your application demands. The springs are offered in Yellow, Blue, Red, Green, and Brown — each color corresponding to a specific inner diameter tolerance, making identification and sorting straightforward on the workbench.
These heavy load compression die springs are well-suited for use in stamping dies and punch press tooling, industrial machinery maintenance and repair, custom jigs, fixtures, and clamping systems, as well as automotive suspension prototyping and mechanical engineering projects requiring precise spring force.
| Spring Type | Heavy Load Compression Die Spring |
|---|---|
| Outer Diameter (OD) | 25mm (approx. 0.98 in) |
| Inner Diameter (ID) | 13.1mm / 13.2mm / 13.4mm / 13.5mm / 13.9mm (see color variant) |
| Free Length Range | 20mm – 300mm (approx. 0.79 in – 11.81 in) |
| Load Class | Heavy Load |
| Color / ID Mapping | Yellow = 13.9mm · Blue = 13.5mm · Red = 13.4mm · Green = 13.1mm · Brown = 13.2mm |
| Pack Quantity | 1 pc or 2 pcs (see variant option) |
| Material | See variant options |
| Surface Finish | See variant options |
| End Type | Closed and ground (standard die spring) |
| Application | Stamping dies, punch presses, fixtures, industrial machinery |
Measure the free length of the spring cavity or housing in your tooling. The spring's free length should match or be slightly shorter than the cavity depth. For die applications, a common rule is to select a free length that allows 20–30% compression at working load. Browse the length options in the variant selector above to find your match.
The color identifies the inner diameter (ID) of the spring: Yellow = 13.9mm, Blue = 13.5mm, Red = 13.4mm, Green = 13.1mm, Brown = 13.2mm. This color-coding follows standard die spring conventions and makes it easy to identify the correct spring for a given guide rod diameter without measuring each time.
The guide rod diameter should be slightly smaller than the inner diameter of the spring to allow free movement without binding. For example, a spring with a 13.9mm ID would typically suit a guide rod of approximately 13–13.5mm diameter. Always verify clearance with your specific rod and housing dimensions before installation.
These springs are designed primarily for industrial tooling and machinery environments. For applications involving moisture, chemicals, or outdoor exposure, additional corrosion protection (such as lubrication or coating) is recommended. Contact us to confirm suitability for your specific environment.
Heavy load die springs (typically color-coded Red or equivalent in standard systems) provide a higher spring rate — meaning they exert more force per unit of deflection compared to medium or light load springs of the same size. Choose heavy load when your application requires strong return force, high clamping pressure, or resistance to set under sustained compression.
Yes. These are compression die springs designed specifically for use in stamping dies, punch presses, and similar tooling. Ensure the OD (25mm) fits your spring pocket and that the selected ID clears your guide rod. Select the appropriate free length based on your die's stroke and pre-load requirements.
Each variant is available in 1-piece or 2-piece packs. For larger quantity requirements, please contact us directly through the store's contact page and we will be happy to discuss your needs.
