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When a mold cycles thousands of times a day or a press tool demands consistent return force, a failing spring isn't just an inconvenience — it's downtime. Engineers, toolmakers, and maintenance professionals who work with injection molds, stamping dies, and industrial fixtures need compression die springs they can spec with confidence across a full range of load requirements.
These compression die springs feature an outer diameter (OD) of 20mm (0.79 in) and an inner diameter (ID) of 10mm (0.39 in), with available lengths ranging from 20mm to 300mm (approximately 0.79 in to 11.81 in). They are manufactured from rectangular cross-section wire wound in a close-coil configuration, finished in colour-coded paint that identifies the load rating at a glance: Brown (TB – Super Heavy), Green (TH – Heavy), Red (TM – Medium), Blue (TL – Light), and Yellow (TF – Lightest).
Typical applications include injection mold stripper plates and ejector return systems, progressive stamping die lifters and pressure pads, and hydraulic press tooling where controlled spring-back force is required. The colour-coded system makes it straightforward to replace worn springs with the correct load grade without referencing a chart every time.
Brown (Super Heavy), Green (Heavy), Red (Medium), Blue (Light), Yellow (Lightest) — identify the correct spring instantly without a reference chart.
Available from 20mm to 300mm (0.79 in – 11.81 in) to suit shallow stripper plates through to deep die sets.
Flat-wire winding delivers higher load capacity per unit length compared to round-wire springs of the same envelope size.
OD 20mm / ID 10mm dimensions conform to widely adopted die spring standards, making direct replacement straightforward.
Close-coil construction and controlled pitch maintain repeatable spring force across extended production runs.
Colour-coded paint coating provides a layer of protection against workshop moisture and light corrosion during storage and use.
| Outer Diameter (OD) | 20mm (0.79 in) |
|---|---|
| Inner Diameter (ID) | 10mm (0.39 in) |
| Available Free Lengths | 20 / 25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 65 / 70 / 75 / 80 / 90 / 100 / 125 / 150 / 175 / 200 / 250 / 300 mm |
| Wire Cross-Section | Rectangular (flat wire) |
| Load Ratings Available | Super Heavy (Brown/TB), Heavy (Green/TH), Medium (Red/TM), Light (Blue/TL), Lightest (Yellow/TF) |
| Winding Type | Close-coil, right-hand |
| Material | See variant options |
| Surface Finish | Colour-coded paint coating |
| Recommended Max Deflection | See variant options |
| Spring Rate | See variant options |
Match the load rating to the force your tooling requires at the working deflection. Brown (TB) is for the heaviest loads, stepping down through Green (TH – Heavy), Red (TM – Medium), Blue (TL – Light), to Yellow (TF – Lightest). If you are replacing an existing spring, match the colour code on the old spring. If designing from scratch, calculate the required spring force at your working stroke and select the grade whose load curve covers that force at the chosen deflection percentage.
The free length should be long enough so that at maximum working deflection the spring is not fully compressed (solid height). A common guideline is to keep working deflection below 30–40% of free length for extended cycle life. Measure your die pocket depth and required stroke, then select a free length that keeps deflection within that range.
Rectangular-wire die springs are specifically designed for high-cycle tooling applications. The flat wire cross-section allows more material in the same envelope, resulting in higher load capacity and better fatigue resistance compared to round-wire springs. For very high cycle counts, keep deflection conservative (under 30% of free length) and inspect springs periodically for set or cracking.
Yes. The OD 20mm / ID 10mm dimensions are consistent with widely used die spring pocket standards. The spring slides over a 10mm guide pin and seats in a 20mm counterbore. Always verify your pocket depth against the free length you select to ensure the spring is not over-compressed at the bottom of the stroke.
The colour-coded paint finish provides basic protection during normal workshop storage. For longer-term storage or humid environments, keep springs in a dry location, ideally in sealed bags or a cabinet away from coolant mist. Avoid stacking heavy items on top of springs, which can cause unwanted pre-set.
Yes, OD 20mm / ID 10mm compression die springs are commonly used in injection mold ejector return and stripper plate applications. Select the load rating based on the return force required and the number of springs sharing the load. Medium (Red/TM) and Heavy (Green/TH) grades are frequently used for ejector return; Super Heavy (Brown/TB) is suited to applications requiring maximum return force in a compact spring pocket.
The five grades represent increasing load capacity: Yellow (TF – Lightest) carries the lowest load per unit deflection, progressing through Blue (TL – Light), Red (TM – Medium), Green (TH – Heavy), to Brown (TB – Super Heavy) which carries the highest load. Choosing a heavier grade than needed will result in insufficient deflection at your working force; choosing too light a grade risks over-deflection and premature fatigue.
