JIS Standard Chrome Silicon Steel Medium Duty Die Spring - 40% Deflection

This medium-duty die spring is used inside die sets to compensate for part thickness variation and to maintain stable return force in repeat press cycles.

• Automotive stamping and connector housings: Select the spring to deliver reliable force at the specified 40% deflection level, helping the punch and die maintain consistent contact and ejection behavior under medium loading (maximum load range up to 5978 N).
• Industrial progressive dies: The chrome silicon steel oil-tempered construction supports stable spring force across typical die loading conditions, reducing force drift that can affect indexing and forming quality.
• Fixture and gauging dies: For setups requiring predictable load response without over-stiff behavior, the balanced 40% deflection rating provides flexibility while still offering meaningful load capacity.

Because this variant is built for JIS-standard integration and uses chrome silicon steel (SWOSC-V equivalent) oil-tempered wire, it is well suited for die spring systems that need consistent performance and straightforward specification matching.

The spring is manufactured from chrome silicon steel with an SWOSC-V equivalent wire. This steel family is selected for good hardenability and strong fatigue resistance in repeatedly loaded die spring applications.

• Manufacturing condition: Oil-tempered (oil-tempered wire spring construction) to stabilize spring behavior after forming.
• Hardness & performance balance: The tempered spring condition provides a practical trade-off of wear resistance and toughness, supporting long service life under compressive cycling while avoiding excessive brittleness.
• Coating compatibility: The spring can be supplied with no coating or coated options to match corrosion environment requirements.

Compared with higher-chromium wear steels used for tooling inserts, this spring steel prioritizes fatigue life and controlled force rather than cutting or abrasion capability.

To select the correct die spring, match your die set’s required return behavior at the target deflection to the spring’s 40% deflection design condition, then verify geometry compatibility.

• Choose by load requirement: Confirm that the needed Maximum Load (N) falls within the available range of 78 ~ 5978 N.
• Verify outer diameter: Select an Outer Diameter D between 6 ~ 70 mm so the spring fits the guide space in the die set and maintains proper alignment.
• Set free/installed length compatibility: Use the available Length L range of 10 ~ 500 mm to ensure sufficient working travel and clearance through the press stroke.
• Coating selection: Pick no coating or coated based on the corrosion exposure of your die cavity area.

Where fit depends on surrounding guides, allow for assembly clearance around D and confirm installation height so the spring operates near the intended deflection without coil bind.