JIS Standard Heavy Duty Die Spring 24% Deflection

This heavy-duty die return spring is used in die sets and press tooling where the mold must reliably return after forming under high load cycles. Its 24% deflection target supports predictable return force, making it suitable for maintaining die closure repeatability.

• Stamping and forming: In progressive or deep-draw dies, select this spring to sustain stable rebound across repeated press strokes, supporting dimensional consistency.
• Automotive component dies: For heavy-load operations (e.g., brackets, panels), the spring range (up to 12557 N) helps maintain actuator/die reset performance in demanding cycle conditions.
• High-cycle production tooling: The chrome silicon wire and oil-tempered behavior are well-matched to applications that experience frequent loading/unloading where resilience and fatigue resistance are critical.

Choose the oil-tempered chrome-silicon variant when you need resilient support with repeatable deflection behavior that aligns with JIS-standard die systems.

The spring is manufactured from chrome silicon spring wire, a steel family chosen for high resilience and good fatigue resistance in repeatedly loaded tooling. The design uses oil-tempered wire behavior to stabilize spring characteristics and improve rebound consistency during press cycling.

• Heat treatment: Oil-tempered condition for resilient performance; designed to resist relaxation under load compared with softer, non-tempered wire.
• Wear and fatigue balance: Chrome silicon composition supports wear-resistant, fatigue-capable behavior in die return service, with performance optimized for cyclic stress rather than heavy impact.
• Coating options: The spring is specified as No coating or Coated; coating primarily addresses surface protection and corrosion resistance depending on your environment.

Note: exact HRC hardness and specific steel designation (e.g., JIS/ASTM mapping) are not provided in the input data, so select hardness based on supplier documentation for the specific wire lot and heat-treatment certificate.

Correct sizing is critical because the die return force depends on both deflection setting and the spring’s physical fit in the die space. This spring series provides ranges for outer diameter (D): 6–70 mm, length (L): 10–350 mm, and maximum load (N): 137–12557 N.

• Match space envelope: Verify the die retainer/guide clearance for the required outer diameter D and available axial stack for length L.
• Match force requirement: Choose the spring rated for the needed maximum load (N) so the required return force is achievable at the 24% deflection target in your stroke profile.
• Account for tolerance and fit: Since coil springs are assembled into spring seats, ensure adequate clearance to avoid binding; consult die spring seat dimensions for the intended locating method. When using coated vs. uncoated variants, confirm that coating thickness does not interfere with seat fit.

Use the available dimensions as your primary selectors—remaining dimensional details (such as end type, free height, or tolerance class) must be confirmed against the specific product drawing for the chosen D/L variant.