Compression Springs

The most common coil spring

Specialists in complex compression springs with fatigue cleaning or relaxation requirements

RPK Group designs and manufactures custom compression springs for applications where fatigue life and relaxation are critical, and failure is not an option. We control the full chain that determines spring durability — alloy selection, shot peening, hot and cold presetting, and 100% inspection — so your spring holds its force over millions of cycles. We produce helical and conical compression springs in carbon steel, stainless steel, chrome silicon, and special alloys, and supply Tier 1 and OEM customers worldwide in accordance with IATF 16949.

Advantages and benefits of compression springs

High energy efficiency: among the most efficient designs for storing and returning load in a compact coil
Built for fatigue and relaxation: engineered for clearance, high-cycle, and relaxation-critical applications
Can be designed to withstand extreme requirements and conditions

Types of Compression Springs

Measures

Wire diameter: 0.10-8 mm (0.004-0.3 in) round and rectangular wire
Other dimensions as required

Materials

The choice of the right material, surface treatment and coating are critical for the final quality and safety of the product. From stainless steels to the most specific materials bought in from the best suppliers.

Carbon steel, almost for every application
Stainless steel, ideal for high stress and fatigue applications
Nitinol
Inconel
Elgiloy
Hastelloy
Chrome silicon
Other materials according to your special requirements

Industries / Applications

Automotive

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Medical

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Electric

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Industrial

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E-Mobility

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Power tools

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Consumer Goods

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Other industries

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Applications for Bike and eBike

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Frequently Asked Questions

What makes RPK Group's compression springs different from catalog spring suppliers?

RPK Group specializes in precision compression springs for demanding applications, high fatigue life, tight rate tolerances, elevated temperature performance, and complex geometries. We do not manufacture catalog springs. Every spring is engineered to the customer's application, with processes such as shot peening, presetting, and 100% inspection applied as required.

What causes spring relaxation, and how do you prevent it?

Spring relaxation (also called creep or set) occurs when a spring loses free length or load under sustained compression, especially at elevated temperatures. RPK Group controls relaxation through proper material selection (chrome silicon and stainless steel resist relaxation better than standard carbon steel), hot presetting (compressing the spring at an elevated temperature to pre-induce the set before delivery), and shot peening (which introduces compressive residual stress that resists relaxation and set).

What are the typical automotive applications for precision compression springs?

Automotive compression springs from RPK Group serve fuel injection systems, transmission valves, brake calipers, turbocharger actuators, suspension bump stops, safety belt mechanisms, and clutch assemblies. Each application has specific fatigue life, load tolerance, and material requirements that we engineer into the design from the outset.

Can you manufacture compression springs for EV drivetrains?

Yes. EV applications include thermal-management valve springs, battery-cell retention springs, contactless retention mechanisms, and actuator return springs. Materials for EV environments are selected for thermal stability and resistance to electrolytic corrosion in battery management system assemblies.

When should I choose a wave spring instead of a compression spring?

When axial space or weight is constrained. A wave spring can deliver the same load in up to 50% less height. We design both and help you choose based on load, deflection, and space.

Do your compression springs meet medical device requirements?

RPK Group manufactures micro compression springs for drug delivery devices, autoinjectors, safety syringes, and wearable medical devices. Medical springs are manufactured in clean-room conditions from biocompatible materials (stainless steel and Elgiloy) and are 100% inspected. Manufacturing complies with ISO 13485 quality requirements.

What quality processes do you apply to compression springs?

Key processes include shot peening for fatigue life, hot and cold presetting for relaxation resistance, passivation for corrosion protection, demagnetization for applications sensitive to magnetic fields, and 100% unitary dimensional inspection for safety-critical parts. We apply the specific combination of processes required by the application.

What wire diameter range can you produce for compression springs?

RPK Group manufactures compression springs from very small wire diameters used in medical and electronic devices up to larger wire diameters required for industrial and automotive applications. Contact our engineering team with your dimensional requirements for a technical assessment.

Get the most out of our expertise

Our engineers work alongside our customers to find the best solution for them, applying scientific methods and knowledge accumulated over almost 50 years.