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Overmolding Services

Norck: Your Partner for Precision Overmolding Solutions

Norck delivers expert overmolding services, creating robust, integrated components for automotive, medical, electronics, consumer goods, and other demanding industries.

Capabilities for Overmolding Excellence:

  • Precision Injection Molding Machines: Accurate substrate positioning, consistent overmolding, and reliable part quality.
  • Engineered Materials: Guidance on selecting the ideal substrate and overmold materials for bonding, functionality, and performance in harsh environments.
  • Specialized Tooling & Automation: Molds with inserts, slides, or multi-shot capabilities, plus automated handling for complex parts and high-volume production.
  • Insert Integration: Pre-treating and securing metal components, sensors, electronics, or other inserts for a strong overmolded bond.
  • Assembly & Finishing: Secondary operations to deliver complete, ready-to-use components, streamlining your project management.

Norck's Engineering Edge: It's About Performance, Not Just Plastic

  • Design for Manufacturability (DFM): Early collaboration to optimize part and insert geometries for efficient overmolding and robust adhesion.
  • Material Science for Success: Matching substrate, overmold, and insert materials for chemical compatibility, thermal expansion, and your application's unique stresses.
  • Process Control & Optimization: Fine-tuning injection parameters and cycle times to ensure strong bonds, encapsulation, and consistent outcomes.
  • Rigorous Quality Assurance: Dimensional inspection, bond-strength testing, and functional validation to guarantee your overmolded parts meet specifications.

Why Choose Norck for Overmolding?

  • Combine Functionalities, Simplify Assembly: Integrate electronics, sensors, structural elements, and more for streamlined, reliable products.
  • Superior Durability & Protection: Overmolding provides impact resistance, environmental sealing, and enhanced grip or ergonomics.
  • Demanding Industry Expertise: Proven success in sectors where performance is critical, and failure isn't an option.
  • Precision for Complex Components: Tight tolerances and intricate features on both the substrate and overmolded elements.
  • Your End-to-End Partner: From mold and insert design to final assembly and testing, we provide a single-source solution.

What is overmolding?

It is a plastic injection molding process that combines multiple plastic materials. The mold for overmolding is made from hardened steel to withstand the pressure and heat of the overmolding process. Overmolding mold is unique compared to insert molding and injection molding mold. The overmolding process is used for high and medium-volume production

Overmolding is used for several purposes, such as:

   • Improving the grip of a component
   • Prevent vibration
   • Add sealing

What are the advantages of overmolding?

Overmolding offers many advantages:

• A rigid connection: The injected plastic englobes the insert, which results in a rigid connection between materials
• Accuracy: Overmolding offers tight tolerances, around ±0.05mm.
• More rigid threads: The inserts are added to a plastic part to avoid wearing of threads in plastic material.
• No need for fasteners: There is no need for post-molding operations as the molded parts come off the mold and can have a mirror glass surface, mat color, or texture.
• Low production costs: The production cost is reduced since post-machining operations are reduced or eliminated.

But there are some disadvantages as well:

   - Longer cycle time
   - Higher cost

How is it fabricated?

There are two types of overmolding:

I. Two Shots overmolding:

1. Plastification:
The plastic granules are transferred from the hopper to the mold using a rotating screw and molted using heaters.

2. First shot: The screw will advance to increase pressure in the injection chamber to inject the molted plastic into the mold. The two cavities are maintained close until the plastic solidifies

3. Die rotation: After injecting the 1stshot, the Die is opened and rotates until the injected part meets the 2ndshot cavity.

4. Second shot: The mold is closed again, and 2ndmaterial is injected into the mold.

5. Ejection: After the molted plastic solidifies using a cooling circuit, the Die is opened, and the part is ejected via ejector pins.

Two Shots overmolding
Overmolding Services
Precision Overmolding Solutions

II. Co-injection molding (2k/3k injection mol):

1. Plastification:
The plastic granules are transferred from both hoppers to the mold using a rotating screw and molted using heaters.

2. First material injection: The first material is injected after closing the mold.

3. Second material injection:The second material is injected without opening the mold.

4. Ejection: After the molted plastic solidifies using a cooling circuit, the Die is opened, and the part is ejected via ejector pins. The screws will retreat to prepare for the next injection.

Two Shots overmolding

Obtaining a fully functional part might require extra processing for features that can’t be made with the overmolding process, such as taping. The designed part should follow Overmolding and overmolding design guidelines.

Norck: Your Data-Driven Partner for On-Demand Manufacturing Excellence

Norck is a technology-powered manufacturing leader specializing in CNC machining, 3D printing, sheet metal fabrication, and injection molding. Our intelligent, data-driven approach ensures exceptional quality, optimized costs, and seamless supply chain management for companies worldwide.

Key Services:

Why Choose Norck?

  • AI-Powered Manufacturing: Data and AI optimize our processes for superior quality, minimized costs, and supply chain visibility
  • Vast Production Capacity: Our extensive partner network in Europe and the US guarantees both low and high-volume production.
  • End-to-End Expertise: Our team of engineers, data scientists, and product developers ensure design for manufacturability and unparalleled service
  • Single-Source Solution: Norck streamlines your supply chain, reduces overhead, enhances purchasing power, and delivers just-in-time results.
  • Online Overmolding  Services: Norck's online overmolding  services provide a fast, easy, and reliable way to bring your ideas to life with high quality, custom made parts.
  • Overmolding Services Near You: Your search for overmolding  services ends here. Norck offers tailored engineering and manufacturing support that begin with your unique project needs. Whether you're a local business or searching online, our expert team delivers top-quality, customized overmolding solutions to bring your designs to life.

Experience the Norck difference. Get a quote fast for your manufacturing needs today!




Engineering Expertise, Every Step of the Way

NORCK offers custom manufacturing and engineering solutions tailored to your specific needs, across various industries.

Optimize Your Design for Production

NORCK's engineers can review your design and provide feedback to improve manufacturability, cost effectiveness, and efficiency.

Your Solution, Your Scale

Whether you need a single prototype or full-scale production, NORCK's engineers are ready to collaborate with you. Contact us to discuss how we can bring your concept to life.

Tailored Solutions for NORCK Customers

NORCK specializes in providing unique manufacturing and engineering solutions designed to meet the specific needs of each client. Our expertise covers a wide range of industries and applications.


Access to Huge Production Capacity - Norck

Get Access to Huge Production Capacity

Besides Norck's own production capacity, Norck has access to hundreds of top quality CNC machining, sheet metal, 3D printing, injection molding, and urethane casting providers across the United States, Germany, and Europe.

 Creating Supply Chain

Creating Supply Chain Resilience

Working with Norck effectively reduces your risks against supply chain shocks, unforeseen delays, price fluctuations, and quality issues, thus increasing your company’s resilience in its outsourcing and supply chain.

Innovation at Work - Norck

Innovation at Work

Besides being an artificial intelligence augmented digital manufacturing company, we also develop extremely innovative manufacturing tools, fixtures and of course software applications such as RapidCAD, a highly intuitive and innovative web based CAD application.

Art artificial intelligent system

Artificial Intelligence Augmented

Norck gathers and uses thousands of data points to augment its engineers with a state of the art artificial intelligent system for better design and manufacturability.

Green Driven - Norck

Green Driven

Norck encourages its partners to be carbon-neutral, and gives carbon neutral compliant suppliers priority over non-compliants.