JIS Standard Chrome Silicon Extra Heavy Duty Die Spring - 20% Deflection

This JIS-configured die spring variant is used in precision injection mold tooling where the die cavity/core assembly must return reliably after opening and closing cycles. Its 20% deflection rating helps absorb impact energy from heavy die loads, reducing vibration that can disturb alignment in high-cycle molds.

• Automotive part forming & large-insert molds: Integrate in stripper plate or die-set return systems to maintain consistent return force when stamping blocks, hot-runner nozzles, or large cavity inserts create higher loads.
• Industrial housings and thick-wall components: Use in molds that experience repeated opening shock; the spring’s chrome-silicon resilience supports stable behavior across varying tooling demands.
• Multi-slide or auxiliary-actuated die stations: Suitable where assembly variations require dependable shock absorption to protect adjacent mechanisms and maintain repeatable stroke recovery.

The chrome-silicon material and heavy-duty construction make it a strong match for applications needing dependable return force under intermittent load spikes.

This spring is made from chrome silicon spring steel, selected for its high elastic resilience and good resistance to fatigue-driven relaxation in cyclic tooling conditions. In practice, chrome-silicon grades are commonly supplied in a heat-treated state (typically quenched and tempered) to balance strength and toughness.

• Heat treatment (typical for chrome-silicon die springs): quenched & tempered to achieve reliable spring temper and stable modulus for repeated deflection.
• Hardness & performance: chrome-silicon steels generally provide high hardness with strong wear/fatigue resistance; the exact HRC level is dependent on the temper cycle used by the supplier.
• Trade-offs: increasing hardness improves fatigue life and resistance to set, while reduced toughness can lower impact tolerance—this spring is built as an extra heavy duty option to preserve performance under shock loads.

If compared against lower-alloy steels, chrome-silicon typically offers better fatigue resistance and stress-relaxation stability for die return use, especially under higher cycle loads.

To select the correct die spring, match the spring outer diameter (D), inner diameter (d), and free length (L) to your mold’s guide, seat, and available space. This product series covers D = 10–60 mm, d = 5–30 mm, and L = 20–300 mm.

• Check packaging/space: Ensure the installed length and surrounding clearances fit within the return assembly envelope for L.
• Confirm guide compatibility: Verify that the d aligns with the guide rod/center post and that D does not interfere with the spring pocket, cap, or neighboring components.
• Deflection suitability: This variant is rated for 20% deflection, so the chosen spring should be sized such that operating stroke stays within the intended deflection window to maintain return force stability.

Account for fit tolerance between spring OD and pocket ID, and between d and the center hardware, to prevent binding and ensure smooth cycling.