Overmolding

Overmolding: Added Value for Metal Components

At RPK Group, overmolding integrates metal parts and technical plastics into high-precision subassemblies ready for final assembly

15/04/2025

At RPK Group, overmolding is a key value-added process that allows us to deliver high-precision subassemblies where metal components, springs, and wire forms are seamlessly integrated with technical plastics and engineered polymers.

This process enables us to provide functional parts that are ready for final assembly, reducing costs and complexity while ensuring total quality in every subassembly.

What is overmolding and why does it add value?

Overmolding combines precision springs, washers, or metal-formed parts with plastic materials through direct injection molding, creating a functional subassembly with:

  • Improved mechanical strength
  • Dimensional integrity
  • Electrical or acoustic insulation
  • Fewer loose parts on the assembly line
  • Enhanced aesthetics and easier assembly
  • Greater flexibility and part protection

In the automotive industry, overmolding is critical for injection systems, valves, actuators, and connectors that require integration of metal parts and precision springs with technical polymers. In the medical field, it allows for the creation of lightweight, functional subassemblies with complex geometries.

Advantages of working with RPK Group

At RPK Group, we offer overmolding with advanced quality control and complete design and engineering capabilities to ensure:

  • Tailored selection of engineering plastics to meet each requirement (PPA, PA66, PEEK, PPS, LCP, etc.)
  • Mold flow simulations to prevent defects
  • Dimensional and critical geometry control in overmolded subassemblies
  • Functional testing for load, strength, and lifecycle
  • Fewer steps in the supply chain

With manufacturing plants in Spain, Mexico, India, and China, we bring production close to our customers' facilities, optimizing logistics and reducing lead times.

Applications of overmolded metal components

RPK Group's precision components are used in:

  • Fuel injection systems
  • Valve and actuator assemblies
  • Electrical connectors and sensors
  • Transmission components
  • Brake and clutch systems
  • Medical devices with integrated metal parts
  • Subassemblies for electric and hybrid mobility
  • Various bus bars and connectors

Through overmolding, our customers reduce assembly operations, prevent handling errors, improve functionality, and optimize system design.

Our commitment to value engineering

At RPK Group, we believe overmolding is a key enabler for integrating metal and plastic components, reducing both cost and complexity, and guaranteeing total quality in every subassembly.

If you're looking for a global partner in precision springs and metal components—with advanced engineering and batch-level quality control, contact our team to discuss your project.

Contact our engineering and sales teams. We will help you find the best solution for your applications.

Contact us now

Do you need help for your next project?

Contact our engineering and sales teams. We will help you find the best solution for your applications.

+34 945 25 77 00

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