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Engineers and toolmakers working with stamping dies, injection molds, and precision fixtures know the frustration of springs that lose their rated load after a few thousand cycles. These yellow-coded die mold compression springs are designed for lightest-duty (TF/light-load) applications where consistent, repeatable force is critical and over-compression must be avoided. They are suited for hobbyists building custom jigs, small-batch manufacturers maintaining press tooling, and maintenance teams replacing worn springs in existing die sets.
Each spring features an outer diameter (OD) of 16mm (~0.630 in) and an inner diameter (ID) of 8mm (~0.315 in), with lengths spanning 20mm to 300mm (~0.787 in to 11.81 in). The wire is cold-drawn alloy steel with a consistent yellow powder-coat finish that serves as the industry-standard color code for lightest-duty load class. End coils are closed and ground flat for stable seating on parallel surfaces.
Typical use cases include: ejector-pin return springs in plastic injection molds, blank-holder springs in sheet-metal stamping dies, and light-preload springs in precision assembly fixtures. The wide length range — from compact 20mm units to 300mm extended-travel versions — makes these yellow die mold compression springs adaptable across multiple tooling stations without sourcing multiple part families.
Industry-standard yellow color coding identifies these as TF/lightest-duty springs, making die-set maintenance fast and error-free when replacing springs by load class.
Nineteen length options from 20mm to 300mm (0.79–11.81 in) let you source the exact free length needed for your die pocket without custom fabrication.
Outer diameter of 16mm and inner diameter of 8mm align with common die-set spring pocket dimensions, enabling drop-in replacement without machining modifications.
Closed, ground end coils provide a flat, stable seating surface that minimizes lateral deflection under load and extends service life in repetitive-cycle tooling.
Order a single spring for a quick repair or a pack of 20 for full die-set replacement — quantity pricing scales to match your maintenance or production budget.
Cold-drawn alloy steel construction and controlled coil pitch deliver stable spring rates across repeated compression cycles, reducing unplanned downtime in production tooling.
| Load Class | Lightest Duty (Yellow / TF) |
|---|---|
| Outer Diameter (OD) | 16mm (0.630 in) |
| Inner Diameter (ID) | 8mm (0.315 in) |
| Free Length Range | 20mm – 300mm (0.787 in – 11.81 in) |
| Wire Diameter | See variant options |
| Spring Rate | See variant options |
| Max. Deflection | See variant options |
| Material | Cold-drawn alloy steel |
| Surface Finish | Yellow powder coat |
| End Type | Closed & ground flat |
| Standard Reference | ISO 10243 / JIS B 5012 (Lightest Duty) |
| Quantity per Pack | 1 / 5 / 10 / 20 pcs (see variant options) |
Measure the depth of the spring pocket in your die plate and add the required pre-compression distance (typically 10–15% of free length for lightest-duty springs). Select the next standard length above that total. For example, a 45mm pocket with 6mm pre-load needs a spring with at least 51mm free length — the 55mm option would be appropriate.
Yellow is the internationally recognized color code for the lightest-duty (TF) load class in die mold spring standards (ISO 10243, JIS B 5012). It indicates the lowest spring rate in the standard range, making these springs suitable for applications requiring gentle, consistent return force without high compressive loads.
The yellow powder-coat finish provides a basic barrier against light moisture and handling corrosion. For environments with cutting fluids, coolants, or high humidity, consider applying a light machine oil to the spring coils. These springs are not rated for immersion or highly corrosive chemical environments.
Yes. The 16mm OD / 8mm ID dimensions are common in both plastic injection mold ejector systems and sheet-metal stamping die blank holders. Verify that the spring pocket diameter and depth in your mold or die match the OD and selected free length before installation.
Most standard die sets use 4–8 springs per station. For a single-station die, a pack of 5 or 10 covers replacement plus spares. For multi-station progressive dies, the 20-piece pack offers the best value and ensures you have matching springs on hand for future maintenance cycles.
Longer springs provide greater total deflection travel and are used in deeper die pockets or where a longer stroke is required. Shorter springs are used in shallow pockets or where space is constrained. The spring rate (force per mm of deflection) varies by length — longer springs of the same OD and wire diameter typically have a lower spring rate. Refer to the specific variant's datasheet or contact us to confirm the spring rate for your selected length.
Yes. The 8mm ID is sized to fit over standard 6–7mm guide pins or mandrels commonly used in die sets to prevent lateral buckling during compression. Always verify your guide pin diameter is at least 1mm smaller than the spring ID to allow free movement without binding.
