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When a mold fails mid-run or a press fixture loses its return force, the culprit is almost always an undersized or worn-out spring. Engineers and toolmakers who demand consistent, repeatable performance need compression die springs sized and rated for the job — not generic hardware-store substitutes. These OD 10mm ID 5mm compression die springs are engineered for industrial tooling environments where load consistency and fatigue life matter.
Each spring features an outer diameter of 10mm (0.394 in) and an inner diameter of 5mm (0.197 in), available in lengths ranging from 10mm to 300mm (0.39 in to 11.81 in). Three material grades are offered: alloy steel for general-purpose tooling, SWOSC-V (oil-tempered silicon-chromium wire) for extended fatigue life in high-cycle applications, and 65Mn spring steel for cost-effective medium-duty use. Load ratings span five color-coded grades — TF-Yellow (light), TL-Blue (light-medium), TM-Red (medium), TH-Green (heavy), and TB-Brown (extra heavy) — following standard die spring color conventions.
Typical applications include injection mold return mechanisms, stamping die stripper plates, jig and fixture clamping systems, CNC router hold-down assemblies, and pneumatic valve return springs. The compact 10×5mm cross-section fits standard die spring pockets and guided spring assemblies used across precision tooling and automation equipment.
OD 10mm / ID 5mm dimensions fit standard die spring guide pins and pockets without modification, ensuring drop-in compatibility with common tooling layouts.
TF-Yellow (light), TL-Blue (light-medium), TM-Red (medium), TH-Green (heavy), and TB-Brown (extra heavy) cover a wide force range for diverse tooling requirements.
Alloy steel for general tooling, SWOSC-V silicon-chromium wire for high-cycle fatigue resistance, and 65Mn spring steel for economical medium-duty applications.
Twenty length options from 10mm to 300mm (0.39–11.81 in) allow precise stroke and deflection matching across mold bases, press tools, and fixture designs.
Tightly wound coils with consistent pitch maintain load accuracy over repeated compression cycles, reducing unplanned downtime in production tooling.
Conforms to standard die spring dimensional conventions, making these a straightforward replacement for worn springs in existing mold and press assemblies.
| Outer Diameter (OD) | 10 mm (0.394 in) |
|---|---|
| Inner Diameter (ID) | 5 mm (0.197 in) |
| Available Lengths | 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 125, 150, 300 mm |
| Load Grade Options | TF-Yellow / TL-Blue / TM-Red / TH-Green / TB-Brown |
| Material Options | Alloy Steel / SWOSC-V / 65Mn |
| Wire Diameter | See variant options |
| Max Deflection Rate | See variant options |
| Spring Rate (N/mm) | See variant options |
| Surface Finish | See variant options |
| End Type | Closed & ground (standard die spring) |
| Operating Temperature | See variant options |
| Product Type | Compression Die Spring |
Die spring load grades are color-coded by stiffness. TF-Yellow is the lightest load, suitable for light ejector or stripper plate return. TL-Blue is light-medium, TM-Red is medium (the most common general-purpose grade), TH-Green is heavy for high-force clamping or stripping, and TB-Brown is extra heavy for demanding press and forming tools. Match the grade to your required spring force at working deflection — consult your tooling design spec or spring force chart for the selected length.
Alloy steel is a cost-effective general-purpose option suitable for standard mold and press tooling with moderate cycle counts. SWOSC-V (oil-tempered silicon-chromium wire) offers superior fatigue resistance and is recommended for high-cycle applications such as high-volume injection molds or progressive dies. 65Mn spring steel is a manganese spring steel that provides a balance of strength and economy for medium-duty applications where SWOSC-V is not required.
The free length should be chosen so that the spring operates within its recommended deflection range — typically 20–40% of free length for standard die springs. Measure the available pocket depth and required stroke in your tooling, then select a free length that keeps the spring within its working deflection range at both minimum and maximum compression. Avoid compressing die springs beyond their rated maximum deflection to prevent set and premature failure.
Standard alloy steel and 65Mn springs have moderate corrosion resistance suitable for indoor tooling environments. For applications exposed to coolant, moisture, or mild chemicals, consider applying a light coating of tooling oil or grease. SWOSC-V material offers slightly better oxidation resistance due to its silicon-chromium composition. For highly corrosive environments, contact us to confirm suitability or inquire about alternative surface treatments.
These springs have an inner diameter of 5mm, so they are designed to slide over a guide pin up to approximately 4.5–4.8mm in diameter (allowing clearance). The outer diameter of 10mm fits a spring pocket of approximately 10.2–10.5mm bore. Verify your guide pin diameter and pocket bore against these dimensions before ordering to confirm fit.
Stacking springs end-to-end (in series) increases total deflection while maintaining the same load rate. Nesting springs concentrically (one inside another) increases load rate while maintaining the same deflection. For this OD 10mm / ID 5mm spring, nesting with a smaller OD spring inside is possible if the inner spring's OD is smaller than 5mm. Always ensure adequate clearance between nested springs to prevent coil binding and interference during compression.
Replace a die spring when it shows visible signs of set (permanent shortening of free length), cracking, corrosion pitting, or when the measured free length has decreased by more than 3–5% from the original. In production tooling, it is common practice to replace die springs on a scheduled basis (e.g., every 500,000–1,000,000 cycles depending on load grade and material) rather than waiting for failure, to avoid unplanned downtime.
