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When a worn or undersized spring causes inconsistent press strokes, mold misalignment, or premature tooling failure, the cost adds up fast. Engineers, toolmakers, and maintenance professionals who demand repeatable, measurable force need a compression die spring they can spec with confidence — one that holds its load rating across thousands of cycles without fatigue.
These compression die springs feature a rectangular wire cross-section wound to tight tolerances, available in four outer diameter groups: Ø30mm (ID 15mm), Ø35mm (ID 17.5mm), Ø40mm (ID 20mm), and Ø50mm (ID 25mm). Free lengths range from 25mm to 300mm (~0.98 in to ~11.81 in), covering light-duty through extra-heavy-duty load classes. Color coding — Yellow, Blue, Red, Green, and Brown — follows standard die spring load classifications so you can identify the correct spring at a glance.
Typical use cases include stamping and punching die sets requiring consistent return force, injection mold stripper plates where controlled ejection pressure is critical, and hydraulic press tooling or fixture clamping systems where a compression spring for industrial machinery must maintain precise deflection under repeated cycling.
Flat-wound wire maximizes coil contact area, delivering higher load capacity per unit length compared to round-wire springs of the same envelope size.
Yellow (light), Blue (medium), Red (heavy), Green (extra-heavy), and Brown (ultra-heavy) color coding aligns with international die spring standards for fast, error-free selection.
Four OD groups (Ø30, 35, 40, 50mm) combined with free lengths from 25mm to 300mm give you the flexibility to match virtually any tooling pocket specification.
Tight winding tolerances ensure repeatable stroke and load characteristics cycle after cycle, reducing variation in stamped or molded part dimensions.
Surface treatment helps resist oxidation in typical workshop and press-shop environments, extending service life between replacements.
Standard OD/ID ratios (2:1) match common die spring pocket dimensions, making these a straightforward swap for worn springs in existing tooling without modification.
| Spring Type | Rectangular wire compression die spring |
|---|---|
| Outer Diameter (OD) | Ø30mm / Ø35mm / Ø40mm / Ø50mm — see variant options |
| Inner Diameter (ID) | 15mm / 17.5mm / 20mm / 25mm (OD:ID ratio 2:1) |
| Free Length | 25mm – 300mm (≈ 0.98 in – 11.81 in) — see variant options |
| Load Class / Color | Yellow (light) / Blue (medium) / Red (heavy) / Green (extra-heavy) / Brown (ultra-heavy) |
| Wire Cross-Section | Rectangular (flat-wound) |
| Material | Spring steel alloy |
| Surface Treatment | Corrosion-resistant coating (color-coded per load class) |
| Packing Quantity | 1 pc per order (multi-pack options: see variant options) |
| Recommended Max Deflection | See variant options / consult load-deflection chart for selected size |
Measure the spring pocket diameter in your tooling to determine the required OD (Ø30, 35, 40, or 50mm). Then measure the available pocket depth and your required working stroke. Free length should equal working length plus your desired deflection. Select the variant that matches both dimensions using the dropdowns above.
The color indicates the load class: Yellow = light duty, Blue = medium duty, Red = heavy duty, Green = extra-heavy duty, Brown = ultra-heavy duty. Higher load classes produce more force at the same deflection. Match the color to your required spring force as specified in your tooling design.
Load capacity varies by OD, free length, and color (load class). Larger OD and shorter free length generally yield higher spring rates. For precise load-deflection values, refer to the load-deflection chart for your selected size and color combination. Contact us if you need specific force data before ordering.
Yes. The surface coating provides resistance to light oxidation and typical press-shop contaminants such as cutting oils and coolants. For highly corrosive environments (salt spray, acids), additional protection or stainless-steel alternatives may be advisable. Contact us to confirm suitability for your specific conditions.
Yes. The OD/ID ratio of 2:1 (e.g., Ø30mm OD / 15mm ID) matches the most common die spring pocket standards used in stamping dies, injection mold stripper plates, and fixture clamping systems. Always verify the pocket diameter, guide pin diameter, and pocket depth against the selected variant dimensions before installation.
In most cases, yes. Match the OD, ID, free length, and load class (color) of the spring you are replacing. If the original spring's color or load class is unknown, measure the pocket and stroke, then calculate the required spring rate to select the appropriate replacement.
Maximum deflection depends on the specific OD, free length, and load class. As a general guideline, die springs should not be compressed beyond their rated maximum deflection (typically 20–40% of free length depending on load class) to avoid permanent set or fatigue failure. Refer to the load-deflection data for your selected variant or contact us for confirmation.
