Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a worn or undersized spring causes inconsistent ejection, misaligned tooling, or premature die failure, the cost in downtime and scrap quickly adds up. These heavy load duty compression die mould springs are engineered for machinists, toolmakers, and production engineers who need dependable, repeatable spring force in demanding press and mould environments.
Each spring is manufactured from high-carbon chromium alloy steel wire, wound to close tolerances and colour-coded by load class for fast identification. Outer diameters span 16 mm (0.63 in), 18 mm (0.71 in), and 20 mm (0.79 in); inner diameters are 8 mm (0.31 in), 9 mm (0.35 in), and 10 mm (0.39 in) respectively. Free lengths range from 25 mm (0.98 in) to 150 mm (5.91 in) across the full variant range.
Typical applications include stamping and blanking die ejection systems, injection mould core-return mechanisms, progressive die stripper plates, and fixture clamping assemblies where consistent heavy-load spring force is critical to part quality and tool longevity.
Wound for heavy-duty deflection force, suitable for high-tonnage stamping and moulding operations where standard springs deflect prematurely.
Available in Yellow, Blue, Red, Green, and Brown — each colour corresponds to a distinct load class, enabling instant visual identification on the shop floor.
Three outer diameter groups (16 mm, 18 mm, 20 mm) combined with free lengths from 25 mm to 150 mm give you the flexibility to match virtually any die pocket specification.
Surface treatment provides resistance to light oils and coolants commonly found in press shop and moulding environments, extending service life between replacements.
Consistent pitch and squareness of ends ensure even load distribution across the spring seat, reducing lateral deflection and die wear.
Dimensioned to align with standard ISO die spring pocket sizes, making these a straightforward swap for worn or broken springs without retooling.
| Type | Compression Die Mould Spring |
|---|---|
| Load Class | Heavy Load |
| Outer Diameter (OD) | 16 mm / 18 mm / 20 mm — See variant options |
| Inner Diameter (ID) | 8 mm / 9 mm / 10 mm — See variant options |
| Free Length | 25 mm – 150 mm — See variant options |
| Material | High-carbon chromium alloy steel |
| Surface Treatment | See variant options |
| Colour / Load Indicator | Yellow, Blue, Red, Green, Brown |
| End Type | Closed & ground (typical for die springs) |
| Standard Reference | ISO 10243 heavy-load class (colour convention) |
| Recommended Max. Deflection | Typically 30–40% of free length (heavy load) |
| Application | Stamping dies, injection moulds, progressive dies, fixture clamps |
Measure the pocket bore (inner diameter of the spring seat), the boss or pin diameter (which becomes the spring's inner diameter), and the available free-length space in the die. Match these to the OD, ID, and free length listed in the variant options. For heavy-load applications, also confirm the required spring force at working deflection against the spring's load curve.
The colour coding follows the ISO 10243 convention for die springs: each colour represents a different load class. In this listing, Yellow, Blue, Red, Green, and Brown variants are all rated as heavy-load springs but may carry slightly different force characteristics per colour sub-class. Select the colour that matches your existing spring specification or your die designer's callout.
These springs feature a surface treatment that provides resistance to light cutting oils and water-based coolants typical in press and moulding shops. For aggressive chemical environments or prolonged immersion, additional protective measures (such as periodic re-oiling) are recommended to maintain service life.
Heavy-load die springs are typically rated for a maximum working deflection of 30–40% of their free length. Exceeding this range accelerates fatigue and reduces service life significantly. Always design your die so the spring operates within this deflection window at full stroke.
Yes. These compression die mould springs are well-suited for injection mould core-return, ejector plate return, and side-action locking mechanisms. Confirm the OD fits your mould pocket and the free length provides adequate pre-load and working stroke for your mould design.
Replace a die spring when you observe: visible cracking or fracture, a measurable reduction in free length (set) of more than 3–5% compared to the original, inconsistent ejection or stripping force, or after reaching the manufacturer's recommended cycle count. Keeping a spare set on hand minimises unplanned downtime.
Yes. The outer and inner diameters are dimensioned to align with ISO 10243 standard die spring pocket sizes for the 16 mm, 18 mm, and 20 mm OD groups. This makes them a direct drop-in replacement for worn springs in most standard tooling without requiring pocket modification.
