WHH Series 35% Deflection Heat Resistant Coil Spring

This heat-resistant coil spring is used inside injection mold tooling wherever stable force and repeatable load behavior are needed under elevated temperatures. Its 35% deflection-rated response helps maintain consistent compression within the allowable deflection band, improving reliability for force-setting functions.

• Hot-runner and heated actuator mechanisms: Works for springs exposed to mold-area thermal loads up to 200°C, helping retain designed force while components cycle between opens/closes.
• End-of-stroke / ejector return force retention: Round-wire compression geometry supports predictable compression under varying spring loads, reducing risk of force drift when deflection stays within 1.7–35 mm.
• Precision plastic part assembly tooling: Use in assemblies that require consistent preload during thermal exposure; the tuned spring constant selection (2.9–14.7 N/mm) supports matching target forces.

Specific alloy/heat-treatment chemistry is not provided in the available metadata for this WHH series spring. Accordingly, the only substantiated material performance statement is its heat-resistant rating for continuous use up to 200°C, making it suitable for thermally stressed mold environments.

• Heat resistance vs. toughness trade-off: For springs operating at high temperature, materials and processing are chosen to maintain load stability; however, higher thermal capability generally requires careful balancing of toughness and stress relaxation.
• Manufacturing process (application-relevant): As a round-wire compression spring, it is typically formed from spring wire to a controlled coil geometry to achieve the stated spring constant and deflection behavior.
• Material comparison: If you compare alternatives, prefer steels or alloys explicitly specified for ≤200°C continuous load stability, then verify hardness and temper/nitriding state to reduce relaxation and set.

To select the correct spring variant, match the required stroke (deflection) and target force to the series’ allowable ranges. Start by determining the operating compression you need; the allowable deflection is 1.7–35 mm, and the series is designed around a 35% deflection response characteristic.

• Choose diameter D: Select D = 4–18 mm based on space constraints in the mold assembly and the spring seat/guide clearance.
• Choose length L: Select L = 5–100 mm to ensure sufficient free length margin for the full operating deflection.
• Match stiffness and load: Use the available spring constants (2.9, 5.9, 9.8, 14.7 N/mm) to achieve your required load. The stated load range is 5–514.8 N.

For fit, ensure your spring seats allow stable alignment during compression. Keep operating deflection within the listed allowable band to maintain consistent load response and avoid premature set.