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When a worn or mismatched spring causes inconsistent press force, tool damage, or premature die failure, the fix starts with selecting the right compression die mould spring. Engineers, toolmakers, and maintenance technicians who demand repeatable stroke performance rely on color-coded duty-rated springs to eliminate guesswork and keep production running.
These compression die mould springs are manufactured from high-carbon chromium alloy steel wire, wound to close tolerances for consistent load characteristics. Outer diameters span 8 mm (0.31 in), 10 mm (0.39 in), and 12 mm (0.47 in), with matching inner diameters of 4 mm, 5 mm, and 6 mm respectively. Available lengths range from 15 mm (0.59 in) to 150 mm (5.91 in) across the full duty range.
Typical applications include injection mould stripper plates, progressive stamping dies, punch-and-die assemblies, and fixture clamping systems where a compression die mould spring must deliver controlled, repeatable return force cycle after cycle.
| Spring Type | Rectangular wire compression die mould spring |
|---|---|
| Outer Diameter (OD) | 8 mm / 10 mm / 12 mm (see variant options) |
| Inner Diameter (ID) | 4 mm / 5 mm / 6 mm (matched to OD) |
| Free Length | 15 mm – 150 mm (see variant options) |
| Duty Rating / Colour | TF Yellow / TL Blue / TM Red / TH Green / TB Brown |
| Material | High-carbon chromium alloy steel wire |
| Surface Treatment | See variant options |
| Spring Rate | See variant options |
| Max Deflection | See variant options |
| Standard Reference | ISO 10243 / JIS B 5012 (colour-code convention) |
| Sold As | 1 piece per unit |
Match the duty rating to the load your die requires at the working deflection. Yellow (TF) handles the lightest loads; Brown (TB) handles super-heavy loads. Calculate the required spring force at your stroke depth, then select the colour whose load curve covers that force at the corresponding deflection percentage. When in doubt, choose the next heavier rating to extend spring life.
The inner diameter (ID) must clear your guide pin with a small running clearance — typically 0.2–0.5 mm. The outer diameter (OD) must fit inside the spring pocket without binding. Available combinations are 8×4 mm, 10×5 mm, and 12×6 mm. Measure your existing spring or die pocket before ordering.
Free length should be long enough so the spring is still under slight preload at the open (top dead centre) position, and short enough that it does not reach solid height at full stroke. A common rule is: free length ≥ working length + stroke + 10–15% safety margin. Available lengths run from 15 mm to 150 mm depending on OD and duty rating.
The surface treatment provides a degree of rust resistance suitable for typical toolroom and press-shop conditions with water-based coolants. For aggressive cutting fluids or high-humidity environments, inspect springs regularly and replace at the first sign of pitting or surface corrosion, as corrosion can initiate fatigue cracks and cause premature failure.
Stacking springs in series reduces the combined spring rate (softer); stacking in parallel (side by side on the same pin) increases load capacity. If you need more force than a single TB-rated spring provides, consider using a larger OD spring or multiple springs in parallel. Never stack springs end-to-end to increase free length without verifying that the combined solid height still allows adequate working stroke.
Replacement interval depends on deflection percentage and cycle count. Springs operated at 30% deflection typically last significantly longer than those run at 50%+. A common industry guideline is to inspect springs every 500,000 cycles and replace any spring showing set (permanent length loss), cracking, or load loss exceeding 10% of the rated value. Always replace springs in matched sets to maintain balanced die force.
The colour-coding convention follows ISO 10243 / JIS B 5012 duty-rating designations (TF, TL, TM, TH, TB). This means the colour identifies the load class, making them interchangeable with other ISO/JIS-coded springs of the same OD, ID, and free length. Verify load curves against your die design data before substituting springs from different manufacturers.
