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When a standard spring fails under repeated industrial cycling, engineers and fabricators pay the price in downtime and rework. These ISO-standard compression die springs are engineered for demanding press tooling, stamping dies, injection molds, and mechanical assemblies where consistent return force and long fatigue life are non-negotiable. Available in two outside diameters — 22mm (0.87 in) and 25mm (0.98 in) — with matching inside diameters of 11mm (0.43 in) and 12.5mm (0.49 in) respectively.
Each compression die spring is manufactured to ISO 10243 dimensional standards from high-tensile alloy spring steel wire, with a precision-ground flat end for stable seating. Lengths range from 20mm (0.79 in) up to 300mm (11.81 in). Load class is color-coded: Yellow (Light), Blue (Light), Red (Medium), Green (Heavy), and Brown (Heavy), allowing fast visual identification on the shop floor.
Typical applications include punch-and-die press tooling for sheet metal fabrication, stripper plate return mechanisms in progressive stamping dies, compression fixtures in quality-control jigs, and spring-loaded clamping devices in CNC machining centers. The standardized ISO geometry makes these springs direct drop-in replacements for worn tooling springs in existing die sets.
Outside diameters of 22mm and 25mm with matched inside diameters of 11mm and 12.5mm — direct fit for standard die spring pockets without modification.
Yellow and Blue for light loads, Red for medium, Green and Brown for heavy loads — color-coded ends allow instant visual identification on the production floor.
Available from 20mm (0.79 in) up to 300mm (11.81 in) to suit shallow stripper plates through deep die sets and custom mechanical assemblies.
Wound from high-tensile alloy spring steel wire for consistent spring rate, resistance to set under repeated cycling, and extended fatigue life in press tooling environments.
Both ends are ground flat and square to ensure stable, parallel seating in die pockets — reducing lateral deflection and uneven wear during high-cycle operation.
Standardized ISO dimensions make these springs direct replacements for worn die springs in existing progressive, compound, and transfer die sets without retooling.
| Standard | ISO 10243 |
|---|---|
| Outside Diameter (OD) | 22mm (0.87 in) / 25mm (0.98 in) |
| Inside Diameter (ID) | 11mm (0.43 in) / 12.5mm (0.49 in) |
| Free Length Range | 20mm–300mm (0.79 in–11.81 in) |
| Material | Alloy spring steel |
| End Type | Closed and ground flat |
| Load Classes Available | Light (Yellow, Blue), Medium (Red), Heavy (Green, Brown) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Max Deflection | See variant options |
| Operating Temperature | See variant options |
Measure the pocket depth in your die plate and determine the required working stroke. A general rule is to select a free length so that the spring operates between 15% and 30% of its free length deflection for light-duty cycling, or up to 40% for heavy-duty applications. Always leave at least 10–15% of free length as a safety margin to prevent coil bind.
The color indicates the load class per ISO 10243: Yellow and Blue are Light load (lower spring rate, suited for stripper plates and light ejection), Red is Medium load (general-purpose tooling), and Green and Brown are Heavy load (high-force clamping, heavy stripper plates, and high-tonnage press work). Select based on the force required at your working deflection.
Yes — provided your existing springs are ISO 10243 standard. Match the outside diameter (22mm or 25mm), inside diameter (11mm or 12.5mm), free length, and load class color. ISO-standard die spring pockets are designed to accept these dimensions without modification.
These springs are wound from high-tensile alloy spring steel wire, which provides a consistent spring rate, good resistance to fatigue under repeated cycling, and adequate performance in typical toolroom temperature ranges. For corrosive environments or elevated temperatures beyond standard toolroom conditions, contact us to confirm suitability.
Yes. ISO compression die springs are widely used in injection mold ejector plates, lifter mechanisms, and side-action returns. Select the appropriate load class based on the ejection force required and ensure the free length suits your mold stack height. Verify operating temperature compatibility with your molding process.
Measure the bore diameter of the spring pocket in your die plate. The spring's outside diameter should be a close sliding fit in the pocket — typically 0.1–0.3mm clearance. For guide-pin mounting, the inside diameter (11mm for 22mm OD springs, 12.5mm for 25mm OD springs) should slide freely over the guide pin with minimal lateral play.
Fatigue life depends on the deflection ratio used in service. Operating at 15–25% of free length deflection typically yields the longest cycle life. Heavy-load (Green/Brown) springs operated at or below 30% deflection are designed for extended high-cycle use in production tooling. Exceeding the recommended deflection ratio will reduce service life.
