Green Heavy Load Die Mold Spring Compression Springs OD 14mm Length 20mm-100mm

Select a free length so that the spring operates between 15% and 30% of its free length in deflection under working load, and does not exceed the maximum allowable deflection (typically 40–45% for heavy-load die springs) at full stroke. Measure the available spring pocket depth and the required working stroke in your tooling, then choose the free length that keeps the spring within its rated deflection range. When in doubt, go slightly longer — you can always add a spacer, but you cannot extend a spring that is too short.

Die mold springs are classified by load rating using a standardized color-coding system defined in ISO 10243 and JIS B 5012. Green indicates the Heavy Load (TH) class — the second-highest load rating in the standard series (Light / Blue → Medium / Red → Heavy / Green → Extra Heavy / Yellow). Green springs have a higher spring rate and load capacity than blue or red springs of the same OD and free length, making them suitable for applications that require significant return force in a compact diameter.

Yes — springs manufactured to ISO 10243 / JIS B 5012 with the same OD, ID, and free length are dimensionally interchangeable across compliant manufacturers. The 14mm OD × 7mm ID dimensions and the heavy-load (green) rating are standardized, so these springs can replace worn or broken springs from other ISO-compliant suppliers in the same pocket without modification. Always verify the free length and load class match your original specification.

These springs are manufactured from alloy spring steel, which provides good mechanical properties but moderate corrosion resistance in its standard finish. For humid environments, coolant-exposed tooling, or outdoor applications, we recommend applying a light coat of machine oil or grease during installation and periodically during service. If your application requires enhanced corrosion protection, contact us to confirm whether a zinc-plated or other treated variant is available for your size.

Heavy-load die mold springs manufactured to ISO 10243 are typically rated for approximately 500,000 to 1,000,000 cycles when operated within the recommended deflection range (not exceeding the rated maximum deflection). Cycle life decreases significantly if the spring is over-compressed beyond its rated stroke. To maximize service life, design your tooling so the spring operates at no more than 30% deflection under normal working load, and inspect springs periodically for signs of set (permanent length reduction) or surface cracking.

Yes — the 14mm OD heavy-load die spring is a common choice for injection mold ejector return systems, stripper plate springs, and core-pull mechanisms where a compact diameter and reliable return force are required. Confirm that the spring pocket in your mold base accommodates a 14mm OD and 7mm ID, and select the free length that provides adequate ejector stroke with sufficient pre-load to keep the ejector plate seated during injection.

Each size is available in packs of 1, 5, 10, or 20 pieces. If you need a single replacement spring for a repair, the 1-piece option is the most economical choice. For new tooling builds where multiple springs of the same size are required, the 5- or 10-piece packs offer a better per-unit value. Toolrooms that regularly stock consumable springs for ongoing production will find the 20-piece pack the most cost-effective for minimizing downtime when springs need replacement.