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When your stamping die, injection mould, or press tool demands consistent, repeatable spring force without overloading delicate components, an incorrectly rated spring causes premature fatigue, misalignment, and costly downtime. These yellow-coded extra light load compression die springs are engineered for engineers, toolmakers, and maintenance professionals who need reliable, standards-compliant springs across a wide range of stroke lengths.
Each spring features a 50mm outer diameter (OD) and 25mm inner diameter (ID), manufactured from high-carbon chromium alloy steel wire with a yellow powder-coat finish for instant load-class identification. Wall thickness is typically 10–12mm. Available lengths range from 50mm to 500mm (~2 in to ~19.7 in), covering short-stroke ejector applications through to deep-draw tooling setups.
Typical use cases include injection mould ejector pin return springs, progressive die stripper plate springs, and hydraulic press cushion assemblies — all scenarios where an extra light load compression mould die spring with a 50mm OD is the correct specification for controlled, low-force cycling.
Color-coded yellow per ISO 10243 / JIS B 5012 standards for instant load-class identification on the shop floor, reducing setup errors.
Consistent outer and inner diameters ensure drop-in fit into standard 50mm spring pockets with guide pins up to 25mm — no machining required.
Sixteen length options from 50mm (~2") to 500mm (~19.7") cover short ejector-pin returns through to deep-draw and long-stroke press applications.
Wound from high-carbon chromium alloy steel wire for fatigue resistance and dimensional stability across repeated compression cycles.
Each length variant is manufactured to a defined spring rate, ensuring predictable force output for stripper plates, ejector systems, and cushion assemblies.
Yellow powder-coat surface treatment provides a protective layer against workshop humidity and coolant exposure, extending service life in production environments.
| Outer Diameter (OD) | 50mm (1.97") |
|---|---|
| Inner Diameter (ID) | 25mm (0.98") |
| Wall Thickness | Typically 10–12mm |
| Available Lengths | 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 125mm, 150mm, 175mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm |
| Load Class | Extra Light (Yellow) |
| Material | High-carbon chromium alloy steel |
| Finish / Color | Yellow powder coat |
| Standard | ISO 10243 / JIS B 5012 |
| Spring Rate | See variant options |
| Max. Deflection | See variant options |
| Quantity per Order | 1 PCS |
Measure the free length of the spring pocket or the distance between the spring seat and the retaining shoulder when the tool is open. Select a free length equal to or slightly longer than this measurement. For ejector pin return springs, the free length should equal the ejector stroke plus the compressed height required to maintain preload.
Yellow indicates an extra light load classification per ISO 10243 and JIS B 5012 standards. This is the lowest load rating in the standard die spring color system (yellow → blue → red → green → brown), making it suitable for applications requiring minimal spring force with controlled deflection.
Yes. The 50mm OD and 25mm ID dimensions conform to ISO 10243 standard sizing, which is widely adopted in mould base and die set designs. They will fit any spring pocket bored to 50mm with a guide pin up to 25mm diameter.
The yellow powder-coat finish provides a protective barrier against light moisture and coolant splash typical in toolroom and press environments. For highly corrosive or submerged environments, additional protective measures or stainless-steel alternatives should be considered.
Yes. These compression die springs are suitable for use as cushion or return springs in hydraulic and pneumatic press tooling, provided the applied load does not exceed the extra light load rating for the selected length. Always verify the spring rate and maximum deflection for your specific stroke requirements before installation.
Die springs are manufactured to tighter dimensional tolerances, use higher-grade alloy steel wire, and are rated for millions of compression cycles under consistent loads. Standard coil springs are general-purpose and not designed for the repetitive, high-cycle demands of stamping dies, injection moulds, or press tooling.
Replace a die spring if you observe: visible cracking or fracture, a free length that has shortened by more than 3–5% from the original specification, uneven coil spacing, or if the tool begins producing inconsistent part quality that cannot be attributed to other causes. Regular inspection at scheduled maintenance intervals is recommended.
