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When a worn or undersized spring causes inconsistent part ejection, mould misalignment, or premature tooling failure, the cost adds up fast. Engineers, toolmakers, and DIY fabricators who demand repeatable force output and long service life need a die spring they can spec with confidence. These compression mould springs are engineered for demanding press, stamping, and injection mould applications where load consistency is non-negotiable.
Each spring is manufactured from high-carbon chromium alloy steel wire, wound to close tolerances and finished with a colour-coded load rating for instant identification. Outside diameters range from 8 mm to 40 mm (approx. 0.31 in to 1.57 in), with inside diameters and free lengths available across a wide matrix of variant combinations — from compact 4 mm ID / 20 mm length up to 25 mm ID / 300 mm length. Five colour codes correspond to load grades: TB-Brown (light), TH-Green (light-medium), TM-Red (medium), TL-Blue (medium-heavy), and TF-Yellow (heavy).
Typical use cases include injection mould ejector pin return springs, progressive die stripper plate springs, hydraulic press cushion springs, and fixture clamping applications. Long-tail search terms that match this product: ISO 10243 die spring replacement, mould ejector spring OD 30mm, colour-coded compression spring for stamping die.
Five distinct colours (Brown / Green / Red / Blue / Yellow) map directly to load duty — eliminate guesswork when selecting or replacing springs in multi-spring tooling setups.
Outside diameters from 8 mm to 40 mm (0.31–1.57 in) paired with inside diameters from 4 mm to 25 mm and free lengths from 20 mm to 300 mm — one listing covers dozens of tooling configurations.
Wound from alloy steel wire for consistent spring rate, fatigue resistance, and dimensional stability across repeated compression cycles in production tooling.
Dimensioned to fit standard die spring pockets on injection moulds, progressive stamping dies, and hydraulic press fixtures without modification.
Light, medium, and heavy load variants available within the same OD/ID/length combination — swap load grade without changing tooling pocket dimensions.
Close-wound construction and controlled wire diameter deliver repeatable deflection-to-load characteristics, supporting accurate part ejection and stripper plate timing.
| Material | High-carbon chromium alloy steel |
|---|---|
| Outside Diameter (OD) | 8 mm – 40 mm (0.31 in – 1.57 in) |
| Inside Diameter (ID) | See variant options |
| Free Length | 20 mm – 300 mm (0.79 in – 11.81 in) |
| Load Grade / Colour Code | TB-Brown (Light) / TH-Green (Light-Medium) / TM-Red (Medium) / TL-Blue (Medium-Heavy) / TF-Yellow (Heavy) |
| Spring Type | Compression die spring |
| Standard Reference | ISO 10243 dimensional series |
| Surface Finish | See variant options |
| End Type | Closed & ground ends |
| Quantity per Order | 1 piece per variant |
Measure the spring pocket bore in your mould or die plate — this gives you the maximum OD. The guide pin or mandrel diameter sets the minimum ID. Free length should be at least 1.3–1.5× your required working stroke to keep deflection within the recommended 20–30% range for long service life. Select the variant that matches all three dimensions.
TB-Brown is the lightest load grade, suited for low-force ejection or light stripper plate applications. TH-Green is light-medium. TM-Red is medium load — the most common general-purpose grade. TL-Blue is medium-heavy, and TF-Yellow is the heaviest load grade for high-force clamping or heavy-duty press work. All grades are available in the same OD/ID/length combinations, so you can upgrade load duty without changing pocket dimensions.
These springs are manufactured from alloy steel, which provides good mechanical properties but is not inherently stainless. For environments with coolant, cutting fluid, or humidity exposure, consider applying a light coat of corrosion-inhibiting oil during storage and periodically during service. If a fully corrosion-resistant option is required, contact us to confirm availability of stainless or coated variants.
Yes — these springs are dimensioned to the ISO 10243 series, which is the internationally recognised standard for rectangular-wire die springs used in mould and die tooling. They are interchangeable with other ISO 10243-compliant springs of the same OD, ID, and free length.
Service life depends on deflection percentage and load grade. Operating at 20–30% deflection of free length is recommended for maximum cycle life — typically 500,000 to 1,000,000+ cycles under normal conditions. Exceeding 40% deflection significantly reduces fatigue life. Replace springs showing visible set (permanent shortening), cracking, or inconsistent force output.
Yes. These compression die springs are suitable for hydraulic press cushion applications, fixture clamping, and workholding setups where a controlled return force is needed. Select the load grade (colour) that matches your required clamp force and ensure the free length and deflection range suit your press stroke.
The variant matrix covers a broad range of OD, ID, and length combinations. If you cannot find the exact specification you need, contact us with your required OD, ID, free length, and load grade — we will advise on the closest available option or check for additional stock.
