JIS Standard Extra Heavy Duty Die Spring SWG Type - 20% Deflection

This extra heavy duty die spring is used inside injection mold tooling and similar press-based systems where the die must withstand repeated mechanical shock while maintaining stable clamp and return behavior. The 18–20% deflection rating supports predictable force response when components experience cyclical opening/closing or localized overloads.

Common scenarios include automotive stamping and forming die sets, where the spring helps absorb impact and recover die position after high-load strikes. It is also suited for industrial transfer or forming stations that rely on consistent return forces for guides, cams, or stripper-related mechanisms.

For molds that see heavy die service, this variant’s engineered load support at 20% deflection helps reduce instability under peak loads and improves fatigue reliability compared with lighter die springs.

• Use in die assemblies requiring stable force during repeated high mechanical loading
• Pair with tooling structures designed around the specified deflection ratio for consistent actuator behavior

The SWG type die spring is described as chrome-silicon construction, a common spring steel family chosen for high strength and good fatigue resistance under cyclic loading. Chrome-silicon steels are typically heat treated to balance wear/abrasion resistance and spring toughness, helping maintain load characteristics over long service cycles.

For die-spring applications, the hardness is controlled by the spring heat treatment state (typically quenched and tempered, or equivalent spring-optimized treatment), targeting an appropriate compromise between elastic recovery and durability. In general, higher hardness improves resistance to permanent deformation, while lower toughness can increase risk of cracking under shock.

• Material focus: chrome-silicon spring properties for fatigue resistance in die service
• Heat treatment: spring-optimized quench/temper to set elastic strength
• Trade-off: maintain toughness for impact resistance while achieving sufficient hardness for stable deflection

Note: Specific HRC values are not provided in the input data.

Select the die spring geometry by matching both deflection ratio and the required load range for your mold/die mechanism. This series supports Allowable Deflection Ratio values of 18% or 20%, so choose the ratio your assembly is designed to operate at—especially if your actuator travel and force curve were calculated for 20% deflection.

Dimension selection is based on Outer Diameter D from 10 to 50 mm and length L from 15 to 200 mm. Once you know the available space and the working stroke envelope, choose D to fit the surrounding guide/seat constraints and choose L to ensure the spring can compress to the intended deflection without bottoming out.

• Match deflection ratio (18% vs 20%) to your force/behavior assumptions
• Choose D (10–50 mm) to fit the die cavity/core surrounding clearances
• Choose L (15–200 mm) to maintain stroke margin at the target deflection

Tolerance note: The input data does not provide tolerance values; confirm spring dimensional tolerances from the JIS/series documentation used by your supplier/manufacturer.