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When your stamping die, injection mould, or CNC fixture demands consistent return force without unpredictable fatigue, a mismatched spring becomes the weakest link in the entire assembly. Engineers and toolmakers who rely on repeatable cycle performance need a mould die compression spring rated precisely for their load requirements — not a generic substitute. These OD 30mm ID 15mm mould die compression springs are engineered for that exact scenario, available in four colour-coded duty ratings so you can match spring stiffness to your application without guesswork.
Each spring features an outer diameter of 30mm (1.18 in) and an inner diameter of 15mm (0.59 in), with spring lengths ranging from 25mm (0.98 in) to 300mm (11.81 in). The body is manufactured from high-carbon spring steel with a surface finish corresponding to duty rating: TF Yellow (Extra Light Duty), TL Blue (Light Duty), TM Red (Medium Duty), TH Green (Heavy Duty), and TB Brown (Super Heavy Duty). Wire diameter varies by duty rating and length — see variant options for exact wire gauge per SKU.
Typical use cases include injection mould stripper plate return mechanisms, progressive stamping die lifters, hydraulic press cushion assemblies, and industrial automation fixture clamping — all applications where a reliable mould die compression spring with a defined free length and load rating is critical to cycle consistency and tooling longevity.
Choose from TF Yellow (Extra Light), TL Blue (Light), TM Red (Medium), TH Green (Heavy), or TB Brown (Super Heavy Duty) to match your exact load requirement without over- or under-springing the assembly.
Consistent outer and inner diameters across all variants ensure drop-in fitment into standard 30mm spring pockets with 15mm guide pins, eliminating lateral play and reducing side-load wear.
Select the exact free length — from 25mm to 300mm — to match your die shut height and required working stroke, avoiding shimming or custom grinding on the shop floor.
Wound from high-carbon spring steel with a surface coating matched to duty rating, these springs deliver consistent load-deflection characteristics across repeated compression cycles in tooling environments.
Squared and ground end coils provide a flat seating surface for stable load transfer in die spring pockets, reducing tipping and ensuring axial force alignment throughout the stroke.
Designed for injection mould stripper returns, stamping die lifters, press cushions, and industrial fixture clamping — wherever a defined free length and rated load capacity are required for repeatable performance.
| Outer Diameter (OD) | 30mm (1.18 in) |
|---|---|
| Inner Diameter (ID) | 15mm (0.59 in) |
| Free Length Range | 25mm – 300mm (0.98 in – 11.81 in) |
| Duty Ratings Available | Extra Light (TF Yellow) / Light (TL Blue) / Medium (TM Red) / Heavy (TH Green) / Super Heavy (TB Brown) |
| Material | High-carbon spring steel |
| End Type | Closed and ground |
| Wire Diameter | See variant options |
| Load Rating | See variant options |
| Deflection Rate | See variant options |
| Surface Finish | Colour-coded by duty rating (per ISO 10243 convention) |
| Application | Mould dies, stamping dies, press cushions, industrial automation fixtures |
Match the duty rating to your required load and deflection. TF Yellow (Extra Light) suits low-load, long-stroke applications. TL Blue (Light) and TM Red (Medium) cover moderate tooling loads. TH Green (Heavy) and TB Brown (Super Heavy) are for high-load stamping and press work. If you know your required spring force and working stroke, calculate the spring rate needed and select accordingly. When in doubt, contact us to confirm.
Measure your die shut height and the required working stroke. The free length should equal the shut height plus the working stroke plus any preload deflection. For example, if your die closes 40mm and you want 10mm of preload, select a free length of approximately 50mm or longer depending on your pocket depth. Always verify the compressed length does not exceed the solid height of the spring.
Yes — the TH Green (Heavy Duty) and TB Brown (Super Heavy Duty) variants are designed for demanding stamping and press applications. The specific load capacity depends on the free length selected; longer springs at the same duty rating will have a lower spring rate. Refer to the variant options for load and deflection data, or contact us with your tonnage and stroke requirements.
These springs are manufactured from high-carbon spring steel with a surface coating. While the coating provides a degree of protection, they are not rated for continuous immersion in coolant or highly corrosive environments. For wet or corrosive tooling environments, consider applying a light oil film during storage and installation, or contact us about alternative material options.
The 15mm inner diameter is designed to fit over guide pins up to approximately 14mm in diameter, allowing a small clearance for smooth travel without excessive lateral play. If your guide pin is larger than 14mm, this spring will not fit without modification. Verify your pin diameter before ordering.
Yes. These mould die compression springs are suitable for both injection mould stripper plate return mechanisms and stamping die lifter/stripper applications. The colour-coded duty rating system follows the ISO 10243 convention commonly used in both mould and die design, making it straightforward to specify the correct spring for either application type.
Check that your spring pocket bore is at least 30mm in diameter and your guide pin is no larger than approximately 14mm. Then confirm the pocket depth accommodates the free length you select, and that the compressed (solid) height of the spring does not exceed the available space at full die closure. If you are unsure, share your pocket dimensions and stroke with us and we can help you select the right variant.
