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When your mold, jig, or fixture demands consistent, repeatable spring force without over-stressing delicate components, finding a die spring with the right load rating is critical. Engineers, toolmakers, and DIY machinists working with injection molds, stamping dies, and precision fixtures need a lightest-load spring that delivers controlled deflection without damaging thin walls or fragile inserts. These Yellow TF Compression Die Springs are engineered specifically for that low-force, high-cycle role.
Each spring is manufactured to TF (Tohatsu-style) die spring standards in the Yellow color code, universally recognized as the Lightest Load rating. The range covers outer diameters from 6mm (0.24 in) to 60mm (2.36 in), with inner diameters at approximately 50% of the OD — for example, 6mm OD × 3mm ID up to 60mm OD × 30mm ID. Available lengths run from 15mm (0.59 in) to 250mm (9.84 in), giving you precise stroke and free-length options across the full size matrix.
Typical use cases include injection mold stripper plate return springs, sheet metal stamping die cushion springs, CNC fixture clamping mechanisms, and light-duty automation tooling where a yellow-coded lightest-load compression die spring is specified. The consistent coil pitch and ground ends ensure flat seating and accurate load curves in every application.
Color-coded Yellow per TF/JIS B 5012 standard, indicating the lightest load class — ideal for applications requiring minimal spring force with controlled deflection.
OD range 6mm–60mm with matching ID at ~50% of OD. Lengths from 15mm to 250mm cover virtually every standard die spring pocket specification.
Both ends are ground flat for stable, perpendicular seating in spring pockets, ensuring accurate load transmission and preventing lateral shift during cycling.
Wound from high-tensile alloy spring steel with consistent coil pitch, these springs maintain load characteristics over extended production run cycles.
Dimensioned to TF die spring standards, making them direct replacements or upgrades in injection molds, stamping dies, and progressive tooling setups.
Each listing is priced per single spring. Select your exact OD × ID size and free length combination from the variant options above to get precisely what your design calls for.
| Spring Type | TF Compression Die Spring |
|---|---|
| Load Rating | Lightest Load (Yellow) |
| Color Code | Yellow |
| Standard | TF / JIS B 5012 / ISO 10243 equivalent |
| Outer Diameter (OD) | 6mm – 60mm (0.24 in – 2.36 in) |
| Inner Diameter (ID) | ~50% of OD (e.g., 3mm – 30mm) |
| Free Length | 15mm – 250mm (0.59 in – 9.84 in) |
| Material | High-tensile alloy spring steel |
| End Type | Closed & Ground |
| Coil Direction | Right-hand wound |
| Surface Finish | See variant options |
| Max Deflection Rate | See variant options |
| Quantity per Order | 1 piece (sold individually) |
Yellow is the universally recognized color code for the Lightest Load rating in the TF (and JIS B 5012 / ISO 10243) die spring classification system. It indicates the lowest spring rate in the standard range — suitable for applications where minimal force is needed, such as stripper plate returns, light ejector mechanisms, or delicate fixture clamping where over-force would damage the workpiece or tooling.
Measure your spring pocket bore diameter — this should match or be slightly larger than the spring's OD. Then measure your guide pin diameter — this should match or be slightly smaller than the spring's ID. For example, if your pocket bore is 12mm and your guide pin is 6mm, select the 12mm OD × 6mm ID variant. Always allow a small clearance (typically 0.1–0.3mm) on both the OD and ID for smooth operation.
The free length should be chosen based on your required working stroke and the compressed length at maximum deflection. A common rule of thumb for lightest-load die springs is to limit deflection to 30–40% of the free length for extended service life. For example, if you need 20mm of stroke, a free length of 50–65mm is a reasonable starting point. Consult your tooling design specifications for exact requirements.
Yes. Yellow lightest-load TF die springs are commonly used in injection mold stripper plate return applications where the spring only needs to push the plate back to its resting position without high force. They are also used in ejector pin return systems and light-duty core pulls. For heavier clamping or high-force ejection, consider a higher load rating (Blue, Red, or Green).
TF die springs are manufactured to tighter dimensional tolerances, use higher-grade spring steel, and feature ground flat ends — all designed for use inside precision spring pockets in molds and dies. Standard coil springs are general-purpose and lack the dimensional consistency, load accuracy, and fatigue life required for high-cycle tooling applications. TF die springs are the correct choice for any mold, die, or precision fixture application.
Service life depends on deflection percentage, operating temperature, and cycle rate. When operated within the recommended deflection range (typically 30–40% of free length for lightest-load springs), TF die springs are designed for millions of cycles. Exceeding the maximum recommended deflection significantly reduces fatigue life. For high-cycle production molds, inspect springs periodically and replace any that show set (permanent length reduction) or cracking.
Standard TF die springs are made from alloy spring steel and may be susceptible to surface rust in high-humidity or wet environments without additional protection. For corrosive environments, consider applying a light machine oil coating during storage and installation, or inquire about stainless steel spring options. In normal indoor toolroom and production environments, these springs perform reliably without special treatment.
Each listing is for one (1) individual spring. The price shown reflects a single piece at the selected OD × ID size and free length. If you need multiple springs for a mold or fixture, simply increase the quantity at checkout. Bulk pricing may be available — contact us for large quantity inquiries.
