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When a mold fails mid-run or a tooling fixture loses its return force, the culprit is often an undersized or wrong-rated spring. Engineers, toolmakers, and serious DIYers who work with injection molds, stamping dies, and precision jigs need a compression die spring they can spec with confidence — one that delivers consistent deflection force across the full stroke without premature fatigue.
These compression die springs feature an outer diameter (OD) of 6mm and an inner diameter (ID) of 3mm, wound from high-grade alloy steel wire with a rectangular cross-section for maximum load density. Available lengths range from 15mm to 100mm (approximately 0.59 in to 3.94 in), with five color-coded load ratings: Yellow (lightest), Blue (light), Red (medium), Green (heavy), and Brown (super heavy). The rectangular wire winding provides a higher load capacity per unit length compared to round-wire springs of equivalent size.
Typical use cases include injection mold stripper plates requiring consistent ejection return force, progressive stamping die lifters needing repeatable stroke control, and compact mechanical assemblies — such as valve actuators or fixture clamps — where space constraints demand a small-diameter, high-performance compression die spring for mold tooling.
Yellow (lightest), Blue (light), Red (medium), Green (heavy), and Brown (super heavy) — select the exact deflection force your application demands without guesswork.
Consistent outer and inner diameters ensure drop-in fit into standard 6mm die spring pockets and smooth travel over 3mm guide pins across all load grades.
Flat-wound alloy steel wire maximizes coil contact area, delivering higher load capacity and longer fatigue life compared to round-wire springs of the same envelope size.
Sixteen length options from 15mm (0.59 in) to 100mm (3.94 in) let you match free length to stroke requirements without custom fabrication.
Wound from alloy steel with a surface finish that resists oxidation under typical workshop and light industrial conditions, supporting repeated compression cycles.
Engineered to maintain rated load force across repeated compression cycles, reducing unplanned downtime in mold and die tooling where spring fatigue causes costly rejects.
| Outer Diameter (OD) | 6mm (0.236 in) |
|---|---|
| Inner Diameter (ID) | 3mm (0.118 in) |
| Wire Type | Rectangular cross-section alloy steel |
| Free Length Options | 15 / 20 / 25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 65 / 70 / 75 / 80 / 90 / 100mm |
| Load Rating / Colour | Yellow (Lightest) / Blue (Light) / Red (Medium) / Green (Heavy) / Brown (Super Heavy) |
| Spring Type | Compression die spring (rectangular wire) |
| Surface Finish | See variant options |
| Max Deflection Rate | See variant options |
| Application | Injection molds, stamping dies, jigs, fixtures, mechanical assemblies |
| Quantity per Order | 1 piece |
Measure the depth of your spring pocket or the required stroke distance. A common rule of thumb is to select a free length that is approximately 1.5–2× your required working stroke, so the spring operates within its rated deflection range without bottoming out. If your stroke is 20mm, a 40–50mm free length is a reasonable starting point.
The colour indicates the spring's load class: Yellow = Lightest load, Blue = Light load, Red = Medium load, Green = Heavy load, Brown = Super heavy load. Choose based on the force your application needs to return or resist. For light ejector pins or small fixtures, Yellow or Blue is typically sufficient. For heavy stripper plates or high-tonnage dies, Green or Brown is recommended.
The inner diameter is 3mm, so guide pins or mandrels up to approximately 2.8mm in diameter are recommended to allow free travel without binding. Always leave a small clearance (typically 0.1–0.2mm) between the guide pin OD and the spring ID.
These springs are wound from alloy steel and are designed for typical workshop and light industrial indoor use. For environments with exposure to moisture, coolants, or chemicals, consider applying a light coating of machine oil or grease to the spring surface, or contact us to confirm suitability for your specific conditions.
Yes. These are standard-format compression die springs designed for mold and die tooling. The 6mm OD fits common small-diameter spring pockets, and the rectangular wire construction provides the fatigue resistance needed for repeated mold cycles. Select the load rating that matches your stripper plate return force requirement.
Each order contains 1 piece. If you need multiple springs for a multi-cavity mold or symmetrical fixture, simply increase the quantity in your cart before checkout.
Die springs use rectangular (flat) wire wound tightly, which allows more wire cross-section per unit of spring height compared to round-wire compression springs. This results in higher load capacity, greater energy storage, and longer fatigue life in the same envelope — making them the standard choice for mold and stamping die applications.
