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When a mold or press tool demands consistent, repeatable force without the bulk of a heavy-duty spring, engineers and toolmakers reach for a light-load die spring. Undersized or mismatched springs cause premature fatigue, uneven ejection, and costly downtime — exactly the problems these Blue TL die springs are engineered to prevent. Whether you are setting up a new stamping die, replacing worn springs in a plastic injection mold, or building a custom fixture, the right spring rate makes all the difference.
These Blue TL compression springs conform to the ISO 10243 / JIS B 5012 light-load (TL) standard. They are manufactured from high-grade chromium-vanadium alloy steel wire, shot-peened and pre-set for extended fatigue life. Outer diameters range from 8 mm (0.31 in) to 40 mm (1.57 in), with matching inner diameters from 4 mm to 20 mm, and free lengths from 15 mm (0.59 in) to 300 mm (11.81 in). The blue color coding instantly identifies the light-load rating on the shop floor.
Typical applications include plastic injection mold ejector systems, progressive stamping die stripper plates, punch-and-die assemblies requiring light return force, jig and fixture clamping mechanisms, and light-duty spring-loaded tooling in CNC machining centers. The wide size range makes them suitable for both prototype tooling and high-volume production dies.
Color-coded blue per ISO 10243 standard for instant identification. Light-load rating suits ejector plates, stripper plates, and return mechanisms where moderate spring force is required.
Wound from Cr-V alloy steel wire for a favorable strength-to-weight ratio, superior fatigue resistance, and stable spring rate across millions of compression cycles.
OD 8–40 mm, ID 4–20 mm, free lengths 15–300 mm. Covers the majority of standard die spring pocket sizes so you can source multiple sizes from a single listing.
Shot peening induces compressive residual stress on the wire surface, significantly extending fatigue life. Pre-setting eliminates initial set loss so the spring maintains its rated free length in service.
Dimensional and load tolerances conform to internationally recognized die spring standards, ensuring drop-in compatibility with existing tooling designed to these specifications.
Designed for high-cycle tooling environments. When operated within the recommended deflection range (typically up to 30–40% of free length for light-load springs), service life extends to millions of cycles.
| Spring Type | Rectangular wire die spring (light load / TL) |
|---|---|
| Color Code | Blue |
| Load Rating | Light Load (TL) |
| Standard | ISO 10243 / JIS B 5012 |
| Material | Chromium-vanadium alloy steel (Cr-V) |
| Surface Treatment | Shot-peened, pre-set |
| Outer Diameter (OD) | 8 mm – 40 mm (0.31 in – 1.57 in) |
| Inner Diameter (ID) | 4 mm – 20 mm (0.16 in – 0.79 in) |
| Free Length | 15 mm – 300 mm (0.59 in – 11.81 in) |
| Recommended Max Deflection | See variant options |
| Spring Rate | See variant options |
| End Type | Closed and ground |
| Quantity per Order | 1 piece (1pc) |
Measure the bore diameter of your spring pocket — the spring OD should be 0.5–1 mm smaller than the bore for a sliding fit. Then measure your guide pin diameter — the spring ID should be 0.5–1 mm larger than the pin. For example, a 20 mm bore with a 10 mm guide pin suits the 20 mm OD × 10 mm ID spring in this listing.
Die springs are color-coded by load rating per ISO 10243 and JIS B 5012. Blue indicates Light Load (TL). Other ratings are: Yellow = Extra Light (TF), Red = Medium Load (TM), Green = Heavy Load (TH), and Brown = Extra Heavy Load (TB). Always match the color code to your tooling's force requirement.
Light-load (blue) die springs are typically rated for a maximum deflection of 30–40% of their free length for long service life. Exceeding this range accelerates fatigue. For example, a 100 mm free-length spring should not be compressed more than 30–40 mm in normal cyclic operation. Consult the specific spring's load-deflection chart for precise values.
Yes. These springs conform to ISO 10243 / JIS B 5012 dimensional standards, which are the basis for most commercial mold base and die set spring pocket designs. They are interchangeable with other ISO/JIS-compliant light-load die springs of the same OD and free length.
Replace a die spring when you observe: (1) visible cracks or fractures on the wire coils, (2) a measurable reduction in free length (set loss) of more than 3–5% compared to the original, (3) inconsistent ejection or stripping force during production, or (4) the spring has reached its rated cycle life. Proactive replacement during scheduled maintenance prevents unplanned downtime.
Absolutely. While designed to die spring standards, these compression springs work well in any application requiring a compact, high-force spring in a guided pocket — including clamping fixtures, spring-loaded plungers, robotic end-of-arm tooling, and custom mechanical assemblies. Ensure the working load stays within the light-load rating for the selected size.
Light lubrication with a suitable grease or oil on the guide pin and spring bore is recommended, especially in high-cycle applications. Lubrication reduces friction between the spring coils and the guide pin, minimizing wear and heat buildup that can shorten spring life. Avoid lubricants that attract metal chips or degrade at elevated temperatures.
