Coil Springs - Medium Pressure - Inch

These medium-pressure coil springs are used as return and action elements inside injection mold tooling where controlled deflection is required under repeated cycling. In automotive connector and latch molds, they can support stable actuator return forces while keeping assembly setup consistent; the hardened alloy steel construction and E-coat corrosion protection help maintain performance around coolers, water lines, and wash-down conditions.

For consumer electronics housings, they are commonly specified in mechanisms such as cam/slide actuation or where a predictable spring rate is needed to manage parting line behavior. The available 25% or 35% free-length options help align spring travel with the mold mechanism’s stroke and shut-off timing.

In medical device housing molds operating at elevated temperatures, the variant’s up to 482°F (250°C) rating supports reliable cycling without premature loss of force. The blue/silver color coding also simplifies fast verification during spring set-up and maintenance.

This spring series is manufactured from hardened alloy steel, selected for a balance of wear resistance and toughness during high-cycle compression. Hardened construction improves resistance to permanent set and helps maintain spring geometry under medium-pressure loads.

The part finish includes an E-coat corrosion protection layer, which is used to mitigate rust and surface degradation in humid or chemically exposed mold environments. This is particularly valuable when molds undergo frequent cleaning or coolant exposure.

• Heat treatment state: hardened alloy steel (hardened condition as supplied for spring performance).
• Hardness: not specified in the provided data; hardness (HRC) should be confirmed against incoming material certifications.
• Trade-offs: increasing hardness typically improves wear resistance but can reduce toughness; the hardened alloy steel selection reflects the need for stable force retention over cycle life.

Select the coil spring by matching the available dimension range to the mold mechanism geometry and required deflection. Use Dd (rod diameter): 1 ~ 11 in to select the spring size that physically fits within your retainer/guide constraints, and choose DH (hole diameter): 1 ~ 5 in to match the locating interface if the spring is mounted through a bore.

Then align the Lo (free length): 1 ~ 12 in with your design’s available travel. For medium-pressure return systems, pick a free length option based on the target travel requirement; the design supports 25% or 35% free length configurations to tune working stroke and durability.

• Spring rate: choose R = 0.6 ~ 100 lbs / (0.10 in deflection) to achieve the required force at the expected deflection.
• Tolerance/fit: deflection-based sizing is critical—verify that the installed free length and guiding clearances allow the spring to compress to the intended travel without binding.