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When a worn or mismatched spring causes inconsistent stroke, premature die failure, or unpredictable ejection force, the cost goes far beyond the part itself. Engineers, toolmakers, and production machinists who rely on repeatable die performance need compression springs that are dimensionally consistent and load-rated to a recognized standard. These compression die mould springs are designed for that exact environment.
Each spring is manufactured from high-carbon chromium alloy steel wire, wound to a rectangular cross-section profile for maximum load capacity within a compact envelope. Outer diameters span 12 mm (0.47 in), 14 mm (0.55 in), and 16 mm (0.63 in), with inner diameters of 6 mm, 7 mm, and 8 mm respectively. Free lengths range from 20 mm (0.79 in) to 300 mm (11.81 in) across the variant matrix, covering the majority of standard die-set pocket depths.
Typical applications include injection mould ejector-pin return systems, progressive stamping die strippers, punch-press pressure pads, and fixture clamping mechanisms. The color-coded load classification — Yellow TF (lightest), Blue TL, Red TM, Green TH, and Brown TB (super heavy) — maps directly to ISO 10243 / JIS B 5012 spring series conventions, making cross-referencing and replacement straightforward for maintenance teams working from existing tooling drawings.
Yellow TF (lightest duty), Blue TL (light), Red TM (medium), Green TH (heavy), and Brown TB (super heavy) — each color maps to a defined deflection-force curve for straightforward specification and replacement.
Outer diameters of 12 mm (ID 6 mm), 14 mm (ID 7 mm), and 16 mm (ID 8 mm) cover the most common standard die-pocket sizes, with guide-pin clearance built into the ID dimension.
Free lengths from 20 mm (0.79 in) to 300 mm (11.81 in) accommodate shallow ejector pockets through deep progressive-die assemblies without custom fabrication.
Rectangular cross-section wire maximizes the active coil contact area, delivering higher load per unit of compressed length compared to round-wire springs of equivalent OD.
High-carbon chromium alloy steel provides fatigue resistance suited to cyclic die-press environments, maintaining consistent spring rate across extended production runs.
Dimensional and load-grade conventions align with ISO 10243 and JIS B 5012 standards, enabling direct substitution in existing tooling designs without re-engineering spring pockets.
| Spring Type | Rectangular-wire compression die mould spring |
|---|---|
| Outer Diameter (OD) | 12 mm / 14 mm / 16 mm |
| Inner Diameter (ID) | 6 mm / 7 mm / 8 mm (matched to OD) |
| Free Length Range | 20 mm – 300 mm (see variant options) |
| Load Grade / Colour | Yellow TF · Blue TL · Red TM · Green TH · Brown TB |
| Wire Cross-Section | Rectangular |
| Material | High-carbon chromium alloy steel |
| Surface Finish | See variant options |
| Standard Reference | ISO 10243 / JIS B 5012 |
| Recommended Max Deflection | See variant options |
| End Type | Closed and ground |
| Application | Die sets, injection moulds, stamping presses, fixture clamps |
Match the OD to your spring pocket bore diameter and the ID to your guide pin diameter, allowing a small running clearance (typically 0.5–1 mm per side). For example, a 16 mm OD spring with an 8 mm ID suits a 16 mm pocket bore and an 8 mm guide pin. Always verify both dimensions against your tooling drawing before ordering.
The color indicates the spring's load classification per ISO 10243 / JIS B 5012: Yellow TF is the lightest duty (lowest force per mm of deflection), followed by Blue TL (light), Red TM (medium), Green TH (heavy), and Brown TB (super heavy). Select a grade based on the required stripping or ejection force in your die. If replacing an existing spring, match the color of the spring being replaced.
The free length should be long enough to provide the required working stroke plus the pre-load deflection. A common rule of thumb is: Free Length = Shut Height + Working Stroke + Pre-load Deflection. Consult your die design specification or the spring manufacturer's load-deflection chart for the selected grade to confirm the working deflection does not exceed the recommended maximum (typically 30–40% of free length for die springs).
Yes. Rectangular-wire die mould springs in chromium alloy steel are specifically designed for cyclic fatigue environments typical of stamping and progressive die presses. Operating within the recommended deflection range (generally ≤30% of free length for maximum cycle life) will extend service life significantly. Avoid operating at or near solid height.
Yes. These springs are widely used as ejector-pin return springs in injection mould tooling. Select the appropriate OD to fit the spring pocket in the ejector plate, ensure the ID clears the ejector pin or guide sleeve, and choose a load grade that provides sufficient return force without overloading the ejector plate structure.
Rectangular-wire springs pack more material into the same OD envelope, resulting in a higher load capacity and greater energy storage per unit of compressed length compared to round-wire springs of the same OD. This makes them the preferred choice for die and mould applications where space is constrained but high force is required.
Replace a die spring if it shows visible cracking, permanent set (free length shorter than nominal by more than 3–5%), uneven coil spacing, or if stripping/ejection performance becomes inconsistent. Proactive replacement at scheduled maintenance intervals — rather than waiting for failure — is recommended in high-volume production environments.
