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When a worn or undersized spring causes inconsistent ejection, misaligned punches, or premature tool failure, the entire production run suffers. Engineers and toolmakers who demand repeatable stroke force and long service life rely on medium-load die mould springs to keep presses and injection moulds running without unplanned downtime.
These TM Red compression springs are manufactured to die-spring standards with a medium load rating. Available in outer diameters of 18 mm (0.71 in), 20 mm (0.79 in), 22 mm (0.87 in), and 25 mm (0.98 in), with inner diameters sized at approximately half the OD for standard guide-pin compatibility. Free lengths range from 20 mm (0.79 in) to 300 mm (11.81 in), covering a wide spectrum of tooling cavities and ejector-plate travel distances.
Typical applications include progressive stamping dies requiring consistent blank-holder force, injection mould ejector systems where controlled return stroke is critical, and punch-and-die assemblies used in sheet-metal fabrication shops that need a direct replacement for ISO 10243 or JIS B 5012 medium-load springs.
| Spring Type | Compression Die Mould Spring |
|---|---|
| Load Class | Medium Load (TM / Red) |
| Outer Diameter (OD) | 18 mm / 20 mm / 22 mm / 25 mm — See variant options |
| Inner Diameter (ID) | 9 mm / 10 mm / 11 mm / 12.5 mm — See variant options |
| Free Length | 20 mm – 300 mm — See variant options |
| Material | See variant options |
| Surface Finish | Red (TM medium-load colour code) |
| Standard Reference | ISO 10243 / JIS B 5012 Medium Load |
| Coil Direction | Right-hand |
| End Type | Closed and ground |
| Quantity per Order | 1 Pc / 2 Pcs / 5 Pcs — See variant options |
Match the outer diameter to the spring pocket bore in your die plate, and confirm the inner diameter clears your guide pin with a small running clearance (typically 0.5–1 mm). For example, an 18 mm OD spring with a 9 mm ID fits a guide pin of approximately 7.5–8.5 mm diameter. Always refer to your tooling drawings for exact pocket and pin dimensions.
The free length should be long enough to provide the required working force at your maximum deflection, while fitting within the available spring pocket depth when the tool is closed. A common rule is to limit deflection to 30–40% of free length for medium-load springs to maintain service life. Measure your ejector travel and add the compressed height to determine the minimum free length needed.
In the standard die-spring colour coding system, Red (TM) represents medium load — stronger than Light Load (Blue/TL) but softer than Heavy Load (Green/TH) and Extra Heavy Load (Brown/TB). Medium-load springs are the most commonly used class, suitable for general ejection, stripping, and blank-holding applications where moderate, consistent force is required.
Yes. The red surface treatment provides a protective coating that resists light corrosion from workshop humidity and water-based cutting fluids. For applications involving aggressive coolants or prolonged immersion, consider wiping the springs dry after use and applying a light machine oil to extend service life further.
Yes. These compression die mould springs are widely used in injection mould ejector plates and return-pin assemblies. Select the OD and free length that match your mould's spring pockets, and ensure the ID clears the ejector or return pin. Medium-load springs work well for standard ejector systems; consult your mould design specifications if unusually high ejection force is required.
The number of springs depends on your die design — progressive dies may use 4 to 12 or more springs per set. We recommend ordering a complete matched set at the same time to ensure uniform load distribution. The 5 Pcs quantity option offers a cost-effective way to stock a full set or keep spares on hand for fast replacement during production.
All three quantity options contain identical springs of the same OD, ID, and free length — only the quantity per order differs. Choose 1 Pc for a single replacement, 2 Pcs for paired installations (e.g., symmetric die layouts), or 5 Pcs for full-set restocking or to keep maintenance spares readily available.
