Die Compression Spring — Heavy-Duty Yellow Springs for Tooling, Presses & Industrial Fixtures
Engineers and toolmakers working with stamping dies, injection molds, and mechanical presses know the frustration of springs that fatigue prematurely or lose load consistency under repeated cycling. These die compression springs are engineered for users who demand reliable, repeatable force across thousands of cycles — from prototype shops to production floors.
Each spring is manufactured from high-grade alloy steel wire with a yellow powder-coat finish, indicating a heavy-load duty rating. The inner diameter (ID) is available in two series: 10 mm (≈ 0.394 in) and 11 mm (≈ 0.433 in), with corresponding outer diameters of 20 mm (≈ 0.787 in) and 22 mm (≈ 0.866 in). Free lengths span 20 mm to 300 mm (≈ 0.79 in to 11.81 in), covering a wide range of stroke and deflection requirements.
Typical applications include die-set return mechanisms in metal stamping, ejector-pin backup springs in plastic injection molds, heavy-load compression fixtures in quality-control jigs, and spring-loaded clamping systems in machining centers. The standardized color coding and dimensional consistency make these springs a reliable choice for die compression spring replacement, heavy-duty coil spring for press tooling, and industrial fixture spring selection.
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Compatibility: Designed to ISO 10243 / JIS B 5012 heavy-load (yellow) die spring standards. Verify bore diameter, rod diameter, free length, and required load before ordering. Select your size from the variant options above.
✅ Key Features of These Die Compression Springs
🟡 Heavy-Load Yellow Rating
Yellow color coding denotes heavy-duty load class per international die spring standards, delivering higher force per unit deflection than light or medium grades.
📐 Wide Size Range
Available in 20 mm and 22 mm OD series with free lengths from 20 mm to 300 mm, covering the majority of standard die-set and fixture spring pockets.
🔩 Alloy Steel Construction
Wound from high-tensile alloy steel wire for consistent spring rate, fatigue resistance, and dimensional stability under repeated compression cycles.
📦 Flexible Pack Quantities
Order as a single piece for prototyping or in packs of up to 50 for production runs — reducing per-unit cost and keeping your toolroom stocked.
🔄 Consistent Spring Rate
Precision-wound coils maintain a linear force-deflection curve, ensuring predictable ejection force, stripping force, or clamping load in every cycle.
🛡️ Corrosion-Resistant Finish
Powder-coat surface treatment provides a baseline layer of corrosion protection suitable for indoor tooling environments and light coolant exposure.
📐 Technical Specifications — Die Compression Springs
| Spring Type |
Die Compression Spring (Heavy Load) |
| Load Class / Color |
Heavy — Yellow |
| Outer Diameter (OD) |
20 mm (≈ 0.787 in) / 22 mm (≈ 0.866 in) |
| Inner Diameter (ID) |
10 mm (≈ 0.394 in) / 11 mm (≈ 0.433 in) |
| Free Length Range |
20 mm – 300 mm (≈ 0.79 in – 11.81 in) |
| Material |
High-tensile alloy steel wire |
| Surface Finish |
Yellow powder coat |
| Standard Reference |
ISO 10243 / JIS B 5012 Heavy Load (Yellow) |
| End Type |
Closed and ground ends (typical for die springs) |
| Spring Rate |
See variant options |
| Maximum Deflection |
See variant options |
| Pack Quantity |
1 / 2 / 3 / 5 / 6 / 8 / 10 / 15 / 20 / 25 / 30 / 50 pcs |
❓ Frequently Asked Questions
How do I choose the correct size die compression spring?
Match the spring to your die-set pocket: the outer diameter (OD) must fit inside the bore, and the inner diameter (ID) must clear the guide rod. Then select a free length that provides the required working stroke with adequate compressed-length clearance. Use the variant selector above to choose OD × ID × free length.
What does the yellow color coding mean?
Yellow indicates the heavy-load class per ISO 10243 and JIS B 5012 die spring standards. Heavy-load springs have a higher spring rate than light (green), medium (blue), or extra-heavy (red) grades, making them suitable for applications requiring significant force in a compact stroke.
Are these springs suitable for use with coolant or cutting fluid?
The yellow powder-coat finish provides basic corrosion protection for indoor tooling environments and incidental coolant splash. For continuous immersion or aggressive coolant exposure, consider additional protective measures or consult your tooling engineer.
Can these springs be used in injection mold ejector systems?
Yes. Die compression springs are widely used as ejector-pin return springs and stripper-plate springs in injection molds. Select the OD and ID that match your mold's spring pocket and guide pin, then choose a free length that delivers the required ejection stroke.
How many cycles can I expect from these springs?
Heavy-load die springs are typically rated for a defined number of cycles at a specified deflection percentage (commonly 20–30% of free length for maximum cycle life). Operating within the recommended deflection range significantly extends service life. Refer to the ISO 10243 standard or contact us for load-cycle data on specific sizes.
Why should I order in bulk packs rather than individual springs?
Ordering in packs of 5, 10, 20, or more reduces the per-unit cost and ensures you have replacement springs on hand when a spring reaches end-of-life during production. This minimizes unplanned downtime in stamping or molding operations.
What is the difference between the 20 mm OD and 22 mm OD series?
The 20 mm OD / 10 mm ID series fits smaller die pockets and guide rods, while the 22 mm OD / 11 mm ID series is suited to slightly larger pockets. Both are heavy-load (yellow) class. Choose based on your existing die-set bore and rod dimensions.
🛒 Select your OD × ID × length and pack quantity above, then add to cart.
