Spring Kits

From automotive to aerospace, our solenoids power critical applications across industries worldwide. Experience the difference precision engineering makes.

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Precision industrial springs and components for manufacturing applications at Kelco Industries.

Spring Return Kits — Color-Coded, Push/Pull, Single-Source

Guardian Spring Kits provide internal spring-return options for all standard Guardian solenoids. Each kit includes color-coded springs in multiple lengths and force levels so engineers can quickly dial in return force, stroke feel, and response time during application development and prototyping. Available across all styles and in both push and pull configurations for fast, single-source integration.

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Need a non‑standard stroke, force curve or package?

If you’re designing the next generation of aerospace systems — whether it’s a fixed-wing UAV, a supersonic commercial jet, or a cutting-edge defense platform — we’re your partner for mission-critical control solutions.

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Frequently Asked Questions

Continuous duty ratings indicate the force a solenoid can maintain indefinitely without overheating. Intermittent duty ratings show peak force for short activation periods (typically 10% duty cycle or less).

Continuous duty ratings indicate the force a solenoid can maintain indefinitely without overheating. Intermittent duty ratings show peak force for short activation periods (typically 10% duty cycle or less).

Absolutely. Our engineering team provides detailed FEA modeling and custom force-stroke curves for all applications, ensuring optimal performance for your specific requirements.

Standard prototypes ship in 2-3 weeks. Custom prototypes require 4-6 weeks. Production quantities depend on volume but typically 6-12 weeks for quantities over 100 units.

Yes, we offer biocompatible materials, low-outgassing components, and can provide material certifications for medical device applications. USP Class VI materials available upon request.