JIS Standard Light Duty Die Spring 40% Deflection

This light duty die spring is used in injection mold tooling primarily as a return and positioning element inside die-set and slide mechanisms where low to moderate closing loads are required. The 40% deflection design supports stable force behavior during light-load press cycles, helping reduce variance in cycle time and part ejection timing.

• Automotive connector and small housing tooling: Suitable for stripper plate, ejector support, or slide return where the spring must repeatedly return light components without excessive stress.
• Consumer electronics enclosures: Works well in forming inserts and mechanical guide systems that benefit from reliable return force at relatively shallow working stroke.
• General industrial die sets: A practical substitution for JIS die spring assemblies when consistent light-load performance and repeatability are required.

Its chrome silicon spring construction is well-suited to maintain resilience and fatigue resistance under frequent cycling.

This JIS standard light duty die spring is manufactured using chrome silicon spring steel, selected for its excellent resilience and fatigue resistance in repeatedly loaded tooling components. Chrome silicon steels are typically chosen where stable spring force is required under cyclic stress, such as die return elements and low-load press mechanisms.

• Hardness: Not provided in the supplied specifications, so hardness in HRC cannot be stated for this exact part.
• Heat treatment: Not provided in the supplied specifications; therefore, the exact condition (e.g., pre-hardened vs. quenched & tempered vs. nitrided) cannot be confirmed from the given data.
• Trade-offs: For light duty applications, the spring is optimized for durability and repeatability at controlled deflection rather than maximum load capacity.

If alternative spring steel options are required for higher-load duty, confirm the steel grade and heat treatment state with the supplier so hardness and wear/toughness balance match your cycle requirements.

Select the die spring dimensions by matching the outer diameter (D), inner diameter (d), and free length (L) to the spring pocket and the functional stroke of your tool return system. The available ranges for this series are D = 10–60 mm, d = 5–30 mm, and L = 20–300 mm.

• Check geometric clearance: Use d to ensure sufficient clearance over the guide rod or center feature, and D to fit within the surrounding housing or spring seat.
• Verify working stroke: Confirm the spring will operate within the 40% allowable deflection ratio referenced by the JIS light duty design to maintain stable force under light-load cycling.
• Length matching: Choose L so the stack height during installation allows the intended working deflection without bottoming.

Tolerances are not specified in the provided data; for press-fit seats or tight guide systems, request the drawing-level tolerances to ensure proper assembly fit and consistent return performance.