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When a worn or mismatched spring causes inconsistent stroke, premature tool damage, or unpredictable ejection force, the entire production run suffers. These compression die mould springs are engineered for toolmakers, press operators, and mould designers who need reliable, repeatable spring performance across stamping dies, injection moulds, and progressive tooling setups.
Each spring is manufactured from high-carbon chromium alloy steel wire, wound to tight dimensional tolerances. Available in two outer diameter series — 20mm OD × 10mm ID and 22mm OD × 11mm ID — with free lengths ranging from 20mm to 300mm (approximately 0.79 in to 11.81 in). Five color-coded load grades span from lightest duty (Yellow / TF) through light (Blue / TL), medium (Red / TM), heavy (Green / TH), to super heavy duty (Brown / TB).
Typical applications include stamping die strippers and blank holders, injection mould ejector return systems, progressive die pilots and lifters, and punch press cushioning — anywhere a compact, high-cycle compression spring with a defined load class is required.
| Spring Type | Rectangular wire compression die spring |
|---|---|
| Outer Diameter (OD) | 20mm / 22mm |
| Inner Diameter (ID) | 10mm (for 20mm OD) / 11mm (for 22mm OD) |
| Free Length Range | 20mm – 300mm (0.79 in – 11.81 in) |
| Load Grade / Colour | TF Yellow / TL Blue / TM Red / TH Green / TB Brown |
| Material | High-carbon chromium alloy steel (Cr-V or Cr-Si, grade dependent) |
| Wire Cross-Section | Rectangular (flat wire) |
| Surface Finish | Shot-peened + colour-coded coating |
| Standard Reference | ISO 10243 / JIS B 5012 (die spring series) |
| Ends | Closed and ground |
| Max Deflection Rate | See variant options |
| Operating Temperature | See variant options |
| Unit Sold | 1 piece per order |
Select based on the force required at your working deflection. Yellow (TF) is the lightest and suits light stripping or ejection tasks. Blue (TL) handles moderate stripping loads. Red (TM) is the most common general-purpose grade for stamping dies. Green (TH) suits heavy blanking or forming operations. Brown (TB) is for the most demanding high-load applications. If you are replacing an existing spring, match the colour code on the old spring.
Measure your die pocket depth and add the required pre-load travel plus working stroke. A common rule of thumb is to keep total deflection within 20–30% of free length for maximum fatigue life. For example, a 100mm free-length spring used at 25mm deflection is at 25% — within the recommended range for most grades.
Yes. These springs are designed to ISO 10243 and JIS B 5012 dimensional standards. The 20mm OD series fits pockets bored for 20mm OD die springs, and the 22mm OD series fits 22mm OD pockets. Always verify your pocket diameter and guide pin diameter before ordering to ensure correct fit and concentricity.
Springs are wound from high-carbon chromium alloy steel — typically chromium-vanadium (Cr-V) for lighter grades and chromium-silicon (Cr-Si) for heavier grades. They are shot-peened to improve fatigue life and coated with a colour-coded surface treatment that provides moderate corrosion resistance. For environments with heavy coolant exposure, periodic inspection and light oiling is recommended.
Yes. These die mould springs are widely used in injection mould ejector return systems. Select the load grade based on the total ejector plate weight and required return force. The 20mm OD series is common for smaller moulds; the 22mm OD series suits medium-to-large mould bases. Ensure the guide pin diameter is compatible with the spring ID (10mm or 11mm respectively).
Service life depends on deflection percentage, load grade, and operating conditions. When used within the recommended deflection range (typically up to 30% of free length for TF/TL, up to 25% for TM/TH/TB), these springs are designed for extended high-cycle use consistent with ISO 10243 fatigue classifications. Exceeding the rated deflection significantly reduces fatigue life. Replace springs in matched sets to maintain even load distribution.
Each listing is sold as a single piece (1 spring per order). You can select exactly the colour, OD × ID, and length combination you need and order as few or as many as required. This makes it straightforward to replace a single failed spring or to stock a range of sizes for your toolroom.
