PCS Coil Springs - Heavy Pressure - Inch

PCS heavy-pressure coil springs are used as returning or maintaining elements in injection mold tooling where consistent deflection translates into stable parting, ejection, or clamp-assist performance. The hardened alloy steel construction and E-coat corrosion resistance make this variant well-suited for mold bases and movable components exposed to wash-down, humidity, or incidental coolant contact.

• Automotive and electrical connector molds: heavy-pressure load behavior helps maintain reliable movement over long production runs, especially when the spring cycles repeatedly and requires controlled free-length for repeatability.
• Medical device housing and cover molds: the corrosion-protective E-coat supports durability in cleaner, moisture-prone environments while preserving consistent spring action for ejector or lifter systems.
• Consumer goods molds with frequent shut-offs: the heavy-pressure design supports stable load response across long service cycles, reducing the risk of drift in high-frequency operation.

Gold/silver color coding also speeds kitting and ensures the correct spring rate and dimensions are matched to each station.

This series uses hardened alloy steel to deliver a balance of wear resistance and toughness for repeatedly compressed spring duty inside mold tooling. The hardened condition improves resistance to permanent set and helps maintain the specified spring rate tolerance over service life.

• Corrosion protection: an E-coat surface finish improves resistance to corrosion in humid or exposed conditions, supporting long-term stability of the spring surface.
• Hardness and performance: while this page specifies hardened alloy steel, exact HRC is not provided in the supplied data; engineers should verify hardness from the material/heat-treatment certificate for acceptance criteria.
• Heat treatment state: described as hardened; for most alloy-steel coil springs this typically corresponds to a quenched-and-tempered or similar hardened state to achieve the needed elasticity and durability.
• Trade-off: higher hardness supports deflection stability and wear resistance, but excessive hardening can reduce toughness—verify fit to your expected shock/load cycles.

Select the spring by matching its rod (wire) diameter Dd, hole/space diameter DH, and free length Lo to the available spring pocket and the motion stack-up in your mold assembly. This series offers these ranges: Dd = 3/16", 1/2", 5/8", 3/4", 1"; DH = 3/8", 1", 1-1/4", 1-1/2", 2"; Lo = 1", 1-1/2", 2-1/2", 3", 7".

• Core/cavity movement fit: confirm the spring can compress within your stroke allowance without bottoming, using your intended deflection and travel limits.
• Load stability: choose the spring rate variant (R with ±10% tolerance) aligned to your required force at the working deflection (R is given in lbs per 0.10 inch deflection).
• Clearance and tolerance: ensure DH and the surrounding guide/pocket geometry provide adequate clearance for free spring operation; use your mold’s dimensional tolerances to avoid rubbing or binding during motion.
• Configurable vs. fixed: dimensions are fixed per SKU configuration (the listed Dd/DH/Lo options). Select the matching configuration rather than modifying dimensions.