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When a worn or undersized spring causes inconsistent stroke, premature tool failure, or misaligned mould components, the fix starts with the right compression spring. These green-coded die springs are engineered for engineers, toolmakers, and maintenance professionals who need reliable, repeatable force in demanding press and mould environments.
Each spring is manufactured from high-grade chromium-silicon alloy steel with a distinctive green powder-coat finish indicating heavy-duty load rating. Outer diameters range from 8 mm (0.31 in) to 40 mm (1.57 in), with inner diameters sized at approximately half the OD (e.g., 8×4 mm, 16×8 mm, 35×17.5 mm). Available lengths span 15 mm (0.59 in) to 300 mm (11.81 in) to suit a wide range of stroke requirements.
Typical applications include injection mould stripper plates, progressive die stamping tools, hydraulic press return mechanisms, and fixture clamping systems — anywhere a consistent, heavy-load compression spring is required for long-cycle industrial use.
| Material | Chromium-Silicon (Cr-Si) alloy steel |
|---|---|
| Load Grade | Heavy Duty (Green) |
| Standard | ISO 10243 / JIS B 5012 (Heavy) |
| Outer Diameter (OD) | 8 mm – 40 mm (0.31 in – 1.57 in) — See variant options |
| Inner Diameter (ID) | 4 mm – 20 mm (0.16 in – 0.79 in) — See variant options |
| Free Length | 15 mm – 300 mm (0.59 in – 11.81 in) — See variant options |
| Surface Finish | Green powder-coat epoxy |
| Spring Rate | See variant options |
| Max. Deflection | See variant options |
| Operating Temperature | Typically up to 180°C (356°F) |
| Quantity per Pack | 1 PCS / 2 PCS / 5 PCS / 7 PCS — See variant options |
Measure the spring pocket diameter in your die plate — the OD of the spring should be 0.5–1 mm smaller than the pocket for a free fit. The ID must clear the guide pin with at least 0.5 mm clearance on each side. For example, a 16×8 mm spring suits a ~17 mm pocket with an ~7 mm guide pin.
Green indicates a heavy-duty load rating per ISO 10243 and JIS B 5012 die spring standards. The color hierarchy from lightest to heaviest is: yellow (light) → blue (medium) → red (heavy) → green (extra heavy). Green springs deliver the highest force per unit deflection in the standard range.
Free length should be chosen so that the spring operates within 20–30% of its rated deflection under working load. A spring that is too short will bottom out; one that is too long may buckle. As a rule of thumb, free length should be no more than 4× the OD without a guide pin to prevent lateral buckling.
Yes. Green die springs are widely used in injection mould stripper plates, lifter return mechanisms, and side-action locking systems. Verify the spring rate and maximum deflection against your mould's stroke and ejection force requirements before installation.
The green powder-coat finish provides moderate protection against workshop humidity and light coolant splash. For environments with continuous coolant immersion or aggressive chemicals, consider additional protective measures or stainless-steel alternatives. Inspect springs periodically for coating wear or surface rust.
Yes, these springs are suitable for use as return or cushion elements in hydraulic and pneumatic press tooling, provided the operating load and deflection remain within the spring's rated specifications. Always confirm the spring rate and maximum safe deflection for your specific press stroke and tonnage.
Most die sets use springs in even numbers (4, 6, 8) arranged symmetrically to distribute load evenly. Order springs from the same size and quantity pack to ensure consistent spring rates across the set. The 5 PCS and 7 PCS options are useful for keeping spares on hand for quick replacement during maintenance.
