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When your mold tooling, stamping press, or mechanical assembly demands consistent return force without premature fatigue, undersized or mismatched springs become a costly bottleneck. Engineers, toolmakers, and DIY fabricators who need a dependable medium-load spring solution will find these red compression die springs engineered to deliver repeatable performance across high-cycle applications.
These die springs are manufactured from high-grade chromium-vanadium alloy steel wire, cold-coiled and shot-peened for fatigue resistance. The red color coding indicates medium load rating per ISO 10243 / JIS B 5012 standards. Outer diameters range from 8mm to 50mm (approximately 0.31 in to 1.97 in), inside diameters from 4mm to 25mm (approximately 0.16 in to 0.98 in), and free lengths from 15mm to 350mm (approximately 0.59 in to 13.78 in).
Typical use cases include injection mold stripper plates requiring medium-load compression die springs, progressive die stamping tools needing consistent spring-back force, and mechanical jigs or fixtures where a compact red die spring with precise deflection control is required.
Red color-coded per ISO 10243 / JIS B 5012 standard, indicating medium load class for balanced force and deflection in tooling applications.
Available in outer diameters from 8mm to 50mm and free lengths from 15mm to 350mm — covering a broad spectrum of mold and press tooling requirements.
Cold-coiled from Cr-V alloy steel wire for high tensile strength, fatigue resistance, and extended service life under repeated compression cycles.
Shot-peening treatment compresses the surface layer, significantly improving resistance to fatigue cracking and extending operational lifespan.
Flat, ground end coils ensure stable seating in die pockets and even load distribution across the spring face — critical for accurate tooling alignment.
Suited for injection molds, stamping dies, progressive tooling, mechanical fixtures, and general industrial spring applications requiring medium-load return force.
| Spring Type | Compression Die Spring |
|---|---|
| Load Rating | Medium Load (Red) |
| Standard | ISO 10243 / JIS B 5012 |
| Material | Chromium-Vanadium Alloy Steel (Cr-V) |
| Surface Treatment | Shot-Peened |
| End Type | Closed & Ground |
| Outer Diameter Range | 8mm – 50mm (0.31 in – 1.97 in) |
| Inside Diameter Range | 4mm – 25mm (0.16 in – 0.98 in) |
| Free Length Range | 15mm – 350mm (0.59 in – 13.78 in) |
| Deflection Rate | See variant options |
| Max. Deflection | See variant options |
| Operating Temperature | See variant options |
| Finish / Color | Red (powder-coated or painted) |
| Quantity | 1 piece per order |
Match the outer diameter (OD) to your die pocket bore, leaving a small clearance (typically 0.5–1mm per side). The inside diameter (ID) should clear your guide pin with a similar small gap. For free length, select a spring that allows your required working stroke without exceeding the maximum deflection limit (typically 30–45% of free length for medium-load die springs). If unsure, contact us to confirm.
Red indicates a medium load rating per ISO 10243 and JIS B 5012 die spring standards. The color system allows quick identification: light load (blue), medium load (red), heavy load (yellow), and extra heavy load (green). Medium-load red springs offer a balance between deflection range and spring force, making them the most commonly used in general mold and press tooling.
These springs are made from chromium-vanadium alloy steel with a shot-peened surface and a painted/powder-coated red finish. The finish provides basic corrosion protection for indoor tooling environments. For applications exposed to coolants, oils, or humid conditions, periodic inspection is recommended. For highly corrosive environments, consider stainless steel alternatives.
For medium-load (red) die springs, the recommended maximum deflection is typically 30–45% of the free length, depending on the specific size. Exceeding the rated deflection significantly reduces spring life. For exact deflection limits per size, refer to the ISO 10243 or JIS B 5012 load-deflection tables, or contact us to confirm for your selected variant.
Yes. These red medium-load compression die springs are designed specifically for mold and die tooling applications, including injection mold stripper plates, ejector systems, progressive stamping dies, and blanking tools. They conform to ISO 10243 / JIS B 5012 standards, making them interchangeable with other compliant die springs in standard pocket sizes.
Choose medium load (red) when you need a moderate spring force with a larger deflection range — ideal for ejector pins, stripper plates, and general tooling return mechanisms. Choose heavy load (yellow) when space is limited and you need higher force in a shorter stroke. If you are replacing an existing spring, match the color code of the original spring for a like-for-like replacement.
Each listing is for 1 piece per order. If you need multiple springs of the same or different sizes, simply adjust the quantity or add multiple variants to your cart. For bulk orders, contact us for availability and pricing.
