WLH Series Heat Resistant Round Wire Spring - 50% Deflection

This heat-resistant round wire coil spring is used as a mold accessory in injection tooling where a stable return force is needed despite elevated temperatures. Because it is rated for continuous service up to 200°C, it helps maintain consistent actuation and part ejection timing in hot-runner and hot-gate environments.

• Automotive and appliance connector molds: replaceable springs in slides or small retract mechanisms to preserve repeatable clamp/eject loads while cycling under elevated tooling temperatures.
• Packaging and consumer electronics housings: thermally stable spring return for lifters or mechanisms that must recover position after high-heat molding cycles.
• Fixturing and secondary operations: use as a heat-tolerant spring element in fixtures that require predictable 50% deflection load behavior.

The round-wire coil geometry and defined 50% deflection characteristic make it suitable for designs that require predictable spring response rather than overspecified force for the full stroke.

The WLH series is specified as a heat resistant round wire coil spring intended for continuous service up to 200°C. Within the provided product data, the exact steel grade and heat-treatment recipe (e.g., quench & temper, nitriding) are not specified, so material hardness values and microstructural conditions cannot be stated from the current specifications.

• Heat resistance focus: designed to maintain spring performance during thermal cycling at up to 200°C.
• Wear/handling trade-off: coil springs prioritize elasticity and fatigue life; overly aggressive hardening that maximizes surface wear resistance can reduce toughness and shift stress distribution.
• Process fit: selection is typically based on required load and allowable deflection rather than material-hardness targets, when only WLH temperature capability is known.

If you need a specific steel grade, hardness (HRC), or heat-treatment state, share your preferred tolerance/fatigue requirements so we can align the spring specification accordingly.

Choose the spring by matching required force, stroke, and geometry from the provided ranges. The WLH series is specified around a 50% deflection behavior, so allowable deflection and resulting load should be checked at the deflection point used by your mechanism.

• Wire diameter (D): select within 4 ~ 18 mm based on space constraints and desired stiffness.
• Spring length (L): select within 5 ~ 100 mm to fit the installed height and to avoid coil bind.
• Allowable deflection: ensure your stroke does not exceed 2.5 ~ 50 mm allowable deflection for the selected size.
• Load requirement: match the expected load in N using the provided ranges 2.5 ~ 147.1 N and the spring constant options (1.0 or 2.9 N/mm).

Fit considerations: confirm installed free length versus compressed/extended length so the spring operates within allowable deflection; since no explicit tolerance band is given, verify fit using your mechanism’s clearance and the target deflection point.