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When a worn or undersized spring causes inconsistent press force, misfires, or premature tool failure, the fix starts with the right compression die spring. These springs are engineered for engineers, toolmakers, machinists, and DIY fabricators who need repeatable, measurable load performance across stamping dies, injection molds, jigs, and mechanical assemblies.
Each spring features an outer diameter of 25mm (approx. 0.984 in) and an inner diameter of 12.5mm (approx. 0.492 in), with lengths ranging from 20mm (0.79 in) to 300mm (11.81 in). Five color-coded load ratings are available — TL Blue (light), TM Red (medium), TF Yellow (fine/light-medium), TH Green (heavy), and TB Brown (extra heavy) — following standard die spring classification conventions. Wire cross-section is rectangular for maximum energy storage within a compact envelope.
Typical use cases include stamping and blanking die return mechanisms, injection mold ejector pin assemblies, hydraulic valve return springs, and custom industrial fixture clamping systems — anywhere a compression die spring with a 25mm outer diameter and precise load rating is required.
TL Blue, TM Red, TF Yellow, TH Green, TB Brown — select the exact deflection force your tooling demands without guesswork.
Consistent outer and inner diameters across all variants ensure drop-in compatibility with standard die spring pockets and guide pins.
From compact 20mm (0.79 in) to extended 300mm (11.81 in) free lengths — cover virtually any stroke and working height requirement.
Flat wire winding maximizes coil density and energy storage per unit length compared to round-wire springs of the same envelope size.
Color-coded surface coating provides identification and a baseline layer of corrosion resistance for workshop and light industrial environments.
Die springs are wound to maintain load consistency over repeated compression cycles — critical for high-volume stamping and molding operations.
| Outer Diameter (OD) | 25mm (0.984 in) |
|---|---|
| Inner Diameter (ID) | 12.5mm (0.492 in) |
| Free Length Range | 20mm–300mm (0.79 in–11.81 in) |
| Wire Type | Rectangular cross-section |
| Load Ratings Available | TL (Light/Blue), TM (Medium/Red), TF (Light-Medium/Yellow), TH (Heavy/Green), TB (Extra Heavy/Brown) |
| Material | See variant options |
| Surface Finish | Color-coded coating (load-rating specific) |
| Standard Reference | ISO 10243 / JIS B 5012 (die spring classification) |
| Ends | Closed and ground (typical for die springs) |
| Application | Stamping dies, injection molds, jigs, fixtures, mechanical assemblies |
Select based on the force required at your working deflection. TL Blue is the lightest load, suited for light ejector or stripper plate return. TM Red is a general-purpose medium load. TF Yellow sits between light and medium. TH Green handles heavy clamping or blanking forces. TB Brown is for extra-heavy-duty applications with high tonnage. If you know your required spring force and deflection percentage, calculate: Load = Spring Rate × Deflection. Contact us if you need help matching load to application.
The free length should be long enough so that at maximum working deflection (typically 15–30% of free length for die springs), the spring still delivers the required force without exceeding its solid height. Measure your available pocket depth and working stroke, then select a free length that keeps deflection within the recommended range for your chosen load rating.
These springs follow the standard die spring color-coding and dimensional conventions aligned with ISO 10243 and JIS B 5012 classifications. The 25mm OD and 12.5mm ID are standard dimensions in these systems. Always verify the specific load-deflection curve against your tooling requirements before installation.
The color-coded surface coating provides a baseline level of corrosion resistance suitable for typical workshop and light industrial environments. For applications involving coolant exposure, high humidity, or chemical contact, consider additional protective measures such as periodic lubrication or housing the spring in a sealed pocket.
Yes. Compression die springs with a 25mm OD are commonly used in injection mold ejector plate return systems. Select the appropriate load rating based on the ejector plate weight and required return force. Ensure the guide pin diameter is compatible with the 12.5mm ID to prevent lateral buckling during operation.
Die springs use rectangular (flat) wire wound in a tight helix, which allows more wire volume per unit length compared to round-wire coil springs. This results in higher load capacity, greater energy storage, and longer cycle life within the same outer envelope — making them the standard choice for precision tooling, stamping, and molding applications where consistent force over many cycles is critical.
Seat the spring squarely in the pocket with the guide pin centered through the ID. Avoid side-loading or cocking the spring during assembly. Apply a light machine oil or grease to the spring surface to reduce friction and extend service life. Inspect springs periodically for set (permanent shortening), cracking, or uneven coil spacing, and replace any spring that shows visible fatigue before it causes tooling damage.
