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When your press tooling, stamping die, or industrial fixture demands consistent, repeatable force under heavy loads, a weak or undersized spring becomes a costly liability. Engineers, toolmakers, and serious DIYers who need a heavy load compression die spring that holds its rated force cycle after cycle will find this range purpose-built for exactly that challenge.
These compression die springs are manufactured from high-carbon chromium alloy steel wire, wound to close tolerances and finished with a protective coating. Outside diameter (OD) ranges from 8 mm to 40 mm (approx. 0.31 in to 1.57 in), inside diameter (ID) from 4 mm to 20 mm (approx. 0.16 in to 0.79 in), and free length from 15 mm to 300 mm (approx. 0.59 in to 11.81 in). Each variant is color-coded red to indicate heavy load rating per ISO 10243 / JIS B 5012 conventions.
Typical use cases include stamping and blanking die sets requiring heavy return force, injection mold ejector systems where consistent spring-back is critical, and custom jig-and-fixture builds where a heavy load compression die spring must fit a precise bore and shaft combination. The wide size matrix also suits maintenance replacement in existing tooling without custom fabrication.
Color-coded red per ISO 10243 / JIS B 5012 heavy load classification, delivering high spring force relative to deflection for demanding press and die applications.
OD from 8–40 mm, ID from 4–20 mm, and free length from 15–300 mm — covering the most common die-set bore and post combinations in a single product family.
Wound from high-carbon chromium alloy steel wire for fatigue resistance and consistent load characteristics across repeated compression cycles.
Precision-wound coils maintain squareness and parallelism of end faces, ensuring even load distribution and reducing lateral buckling risk in guided applications.
Applied coating guards against surface oxidation during storage and service, extending functional life in workshop and production environments.
Dimensioned to ISO 10243 / JIS B 5012 standards so these springs serve as direct replacements in existing tooling without modification to the die set.
| Product Type | Heavy Load Compression Die Spring |
|---|---|
| Load Rating | Heavy (Red) |
| Standard Reference | ISO 10243 / JIS B 5012 |
| Outside Diameter (OD) | 8 mm – 40 mm (0.31 in – 1.57 in) |
| Inside Diameter (ID) | 4 mm – 20 mm (0.16 in – 0.79 in) |
| Free Length | 15 mm – 300 mm (0.59 in – 11.81 in) |
| Material | High-carbon chromium alloy steel |
| Surface Finish | Protective coating (color: red) |
| End Type | Closed and ground ends |
| Spring Rate | See variant options |
| Maximum Deflection | See variant options |
| Wire Diameter | See variant options |
Match the outside diameter (OD) to your die bore so the spring seats without side play, and match the inside diameter (ID) to your guide post so the spring slides freely without binding. A typical clearance of 0.5–1 mm between the ID and post diameter is recommended. Select your OD and ID from the variant dropdowns above.
Red indicates a heavy load rating per ISO 10243 and JIS B 5012 standards. Heavy load springs have a higher spring rate (more force per mm of deflection) compared to light (yellow), medium (blue), or extra-heavy (brown) rated springs. Choose heavy load when your application requires significant return force in a compact free length.
Measure your die shut height and the required working stroke. The free length should equal the shut height plus the working stroke plus any pre-load deflection you intend to apply. Avoid compressing heavy load die springs beyond 30–35% of their free length to maintain fatigue life.
The protective coating provides resistance to surface oxidation during normal workshop storage and use. For environments with continuous moisture, coolant exposure, or chemical contact, consider applying a compatible lubricant or grease to the spring coils during installation to extend service life.
Yes. These springs are dimensioned to ISO 10243 / JIS B 5012 standards, making them direct replacements for springs of the same OD, ID, free length, and load color in most commercial die sets. Verify the OD, ID, free length, and load color of your existing spring before ordering.
For heavy load (red) die springs, the maximum recommended deflection is typically 30–35% of the free length for extended fatigue life. Operating at or near solid height will significantly reduce cycle life. If your application requires more than 35% deflection, consider using a longer free length or a different load class.
The number of springs depends on the total stripping or return force required divided by the force each spring provides at your working deflection. Calculate the required total force from your material thickness and shear strength, then divide by the per-spring force at working deflection. Using multiple springs of the same size ensures even load distribution across the die plate.
