Insert molding is a specialized manufacturing process that combines metal or other preformed components with plastic materials during injection molding to create durable, high-performance parts.
This technique enhances the mechanical strength and functionality of plastic components, making it ideal for industries ranging from automotive and aerospace to medical devices and consumer goods.
As demand for complex, precise, and reliable parts grows, choosing the right insert molding company becomes crucial to ensure quality, efficiency, and innovation in production.
In this article, we explore the top insert molding companies globally in 2026, highlighting their capabilities, expertise, and services to help you find the perfect manufacturing partner for your project.
Overview Of Insert Injection Molding Process
Insert molding is a plastic injection molding process in which an insert, such as an object or component, is placed into the mold cavity and then injected with molten plastic that is thus molded around it.
This technique creates a single, integrated part combining the strength and functionality of the insert with the versatility and lightweight properties of plastic. Common inserts include metal inserts, threaded inserts, ceramics, or plastic pieces.
The process begins by placing the preformed insert into the mold, which is then closed and filled with heated thermoplastic resin through a heated barrel. The molten plastic flows around the insert, bonding it securely as it cools and solidifies under pressure.
This method ensures tight tolerances and excellent adhesion between materials, resulting in durable plastic parts suitable for complex assemblies across multiple industries such as automotive, aerospace, medical devices, and consumer goods.
Insert molding offers several advantages, including reduced assembly steps, improved mechanical properties, enhanced durability, and the ability to produce complex geometries in a streamlined production process.
Many insert molding companies provide additional engineering services, including insert mold design, part design assistance, and post molding operations like assembly and finishing, to deliver high-quality final parts tailored to specific customer needs.
Top 10 Recommended Insert Molding Companies in 2026
1.Proto Labs
Established Year:1999
Main Business:Injection Molding,CNC Machining,3D Printing,Sheet Metal Fabrication
Website:https://www.protolabs.com/
Address:5540 Pioneer Creek DrMaple Plain, MN 55359,United States
Company Profile:
Proto Labs is a leader in the insert molding industry, renowned for its rapid and precise custom plastic injection molding services.
They support a wide range of thermoplastic materials and elastomers, serving multiple industries including automotive, electronics, medical devices, and consumer goods.
Their insert molding process integrates metal components such as threaded inserts and bushings into plastic parts within a single molding cycle, enhancing the mechanical strength and durability of the final product.
With high-quality aluminum molds and advanced digital manufacturing technology, Proto Labs delivers quickly, typically completing prototypes and small batch production within 15 days.
Proto Labs consistently focuses on quality, innovation, and customer service, making it a leading insert molding company capable of meeting diverse needs from prototyping to mass production.
2.AdvanTech Plastics
Established Year:1986
Main Business:Plastic Injection Molding Solutions
Website:https://advantechplastics.com/
Address:2041 Dillard Court, Woodstock IL 60098
Company Profile:
AdvanTech Plastics is a leading provider of plastic injection molding solutions with extensive molding capabilities and deep expertise.
Their injection molding team possesses a wide range of insert molding capabilities, flexibly utilizing various materials such as polypropylene, thermoplastic elastomers, silicone rubber, glass fiber reinforced nylon, and polycarbonate to meet diverse customer needs.
The company’s production capacity covers all stages from rapid prototyping to high-precision mass production, ensuring excellent quality and performance even for complex geometries and strict tolerance requirements.
In addition, AdvanTech Plastics offers comprehensive design support and secondary services to help customers optimize product design, streamline the supply chain, and achieve efficient production and delivery.
3. Ironwood Plastics, Inc.
Established Year: 1979
Main Business: Insert Molding and Overmolding
Website: https://www.ironwood.com/
Address: 2800 18th St, Two Rivers, WI 54241
Company Profile:
Ironwood Plastics, Inc. is a well-established injection molding company specializing in high-precision plastic injection molding solutions, including insert molding and overmolding.
The company uses medium to high-cavity injection molds, vision-assisted robots for insert loading and part ejection, and specialized online inspection equipment to achieve 100% verification of critical features.
Ironwood utilizes advanced manufacturing technologies and quality control systems to ensure consistent, reliable production outcomes.
With a deep understanding of complex assemblies and materials, Ironwood Plastics works closely with customers to deliver tailored solutions that enhance durability and functionality of plastic components. Their commitment to innovation and quality makes them a trusted partner in the insert molding industry.
4.EVCO Plastics
Established Year: 1964
Main Business: Manufacturing & Injection Molding
Website:https://www.evcoplastics.com/
Address: 121 EVCO Circle,DeForest, Wisconsin 53532
Company Profile:
EVCO Plastics, founded in 1964, is a globally recognized plastic manufacturing company certified as a national women-owned business.
It specializes in high-quality plastic injection molding solutions and is renowned in the industry for its innovation, technical strength, and global presence.
The company has extensive experience in custom insert molding, encapsulating metal, plastic, or other inserts with thermoplastic polymers to create robust, integrated components.
These parts are designed for applications across various industries that require enhanced strength, durability, or functional integration.
With over 60 years of rich experience and strong injection molding capabilities, EVCO Plastics has grown to become a global leader in custom plastic injection molding.
5. Xcentric
Established Year: 1996
Main Business: Rapid Injection Molding, CNC Machining, and Additive Manufacturing
Website: https://xcentricmold.com/
Address: 24541 Maplehurst, Clinton Twp, MI 48036, USA
Company Profile:
Xcentric is a leading manufacturer specializing in rapid injection molding, CNC machining, and additive manufacturing. It is one of the few companies offering both overmolding and insert molding services.
In insert molding, Xcentric integrates metal or other preformed components into plastic parts through precise injection molding. Their expertise allows them to produce durable, high-quality plastic components with embedded metal inserts, enhancing mechanical strength, durability, and functionality.
They utilize advanced tooling manufacturing and processing techniques to ensure tight tolerances and excellent bonding between plastic and insert materials.
Committed to quality, innovation, and customer satisfaction, Xcentric is a trusted partner in insert molding, especially for projects requiring high precision, complex geometries, and reliable manufacturing processes.
6.New Concept Technology
Established Year: 1996
Main Business: Injection Molding& Insert Molding
Website: https://www.newconcepttech.com/
Address:320 Busser Road,Emigsville, PA 17318-0297
Company Profile:
New Concept Technology is a single-source supplier offering design, engineering, process development, manufacturing, and production services, providing customized insert molding solutions.
The company utilizes advanced six-axis robotic arms and laser displacement technology to accurately place metal components into mold cavities, ensuring high precision in insert positioning.
After removing the metal components, robotic soft sensing technology is employed to track the process, guaranteeing continuous and highly automated production.
New Concept Technology has delivered customized insert molding solutions to numerous Fortune 500 companies, demonstrating its professional expertise and the high level of trust from its clients.
Overall, the company emphasizes technological innovation and automation, dedicated to providing customers with high-quality and efficient insert molding services.
7. FOW Mould
Established Year: 1978
Main Business: Injection Mold & Injection Molding
Website: https://www.immould.com/
Address: No.328 Xiaoliqiao Village, Beiyang Town, Huangyan, Taizhou, Zhejiang, 318024, China
Company Profile:
FOW Mould is a well-established company specializing in precision injection mold manufacturing and injection molding services.
With decades of experience, FOW Mould offers comprehensive capabilities in insert molding, integrating metal or other inserts into plastic components to enhance strength, durability, and functionality.
Their advanced molding technologies and strict quality control ensure high-precision parts with tight tolerances, suitable for complex assemblies across various industries, producing parts that meet demanding specifications efficiently.
8.Ferriot Inc
Established Year: 1929
Main Business: Full-Service Engineering and Custom Injected Molded Parts
Website: https://www.ferriot.com/
Address: 1000 Arlington Circle, Akron, Ohio 44306-3973
Company Profile:
Ferriot is a comprehensive custom injection molding and contract manufacturing company headquartered in the United States, with a 200,000-square-foot office and manufacturing facility.
It is dedicated to providing innovative and high-value product manufacturing solutions to original equipment manufacturer (OEM) customers worldwide.
Ferriot has extensive experience in insert molding, combining unique process optimization techniques with advanced robotic automation systems to reduces human error and production time in the insert molding process.
With strict quality control and continuously improving manufacturing processes, Ferriot is able to meet customers’ demands for high-precision and high-performance complex parts, making it a trusted partner.
9.PTI Engineered Plastics, Inc.
Established Year: 1984
Main Business: Custom Injection Molding
Website: https://teampti.com/
Address: 50900 Corporate Dr, Macomb, MI 48044, United States
Company Profile:
PTI Engineered Plastics provides custom injection molding solutions from prototyping to high-volume production and assembly.
With expertise in insert molding, they handle various inserts like threaded inserts and metal components to create strong, integrated parts.
Their 160,000 sq. ft. ISO 13485:2016-certified facility features Class 8 cleanrooms and automated robotics, ensuring quality and consistency.
With over 40 years of experience, PTI is a trusted partner known for technical strength, fast response, and customer focus.
10.Weiss-Aug
Established Year: 1972
Main Business: Precision metal stamping and injection molding
Website: https://weiss-aug.com/
Address: 220 Merry Lane,East Hanover, NJ USA 07936
Company Profile:
Weiss-Aug is a leading manufacturer certified with ISO 9001:2015, ISO 13485:2016, and ISO 14001:2015, specializing in high-quality insert molding parts and components for demanding applications.
The company operates eight advanced manufacturing facilities in the United States and Mexico, including a dedicated Lupine R&D center, covering a total area of 445,000 square feet equipped with modern production equipment.
With over 50 years of experience in precision metal stamping, insert molding, and value-added assembly, Weiss-Aug is committed to providing customized solutions for customers in the medical, automotive, interconnect, and industrial sectors, ensuring excellent product performance and reliability.
|
Rank |
Company Name |
Established |
Main Business Highlights |
Recommendation |
|---|---|---|---|---|
|
1 |
Proto Labs |
1999 |
World’s strongest rapid iteration and digital platform, prototype/small batch delivery within 15 days |
★★★★★ |
|
2 |
AdvanTech Plastics |
1986 |
Multi-material insert molding |
★★★★☆ |
|
3 |
Ironwood Plastics, Inc. |
1979 |
High-precision insert/overmolding, vision-assisted robots + 100% online inspection, complex assemblies |
★★★★☆ |
|
4 |
EVCO Plastics |
1964 |
Large/medium volume production, insert molding, multi-color, gas-assisted, cleanroom, global supply chain |
★★★★★ |
|
5 |
Xcentric |
1996 |
Ultra-fast tooling/insert molding, delivery from days to weeks, precision tolerances |
★★★★☆ |
|
6 |
New Concept Technology |
1996 |
Automated robots + laser positioning inserts, six-axis robots, highly automated, Fortune 500 customers |
★★★★☆ |
|
7 |
FOW Mould |
1978 |
Precision molds + insert molding, high-precision tolerances, cost advantages, China supply chain |
★★★★ |
|
8 |
Ferriot Inc |
1929 |
Full-service engineering, insert molding + robotic automation, complex part optimization |
★★★★ |
|
9 |
PTI Engineered Plastics |
1984 |
Prototyping to medium-high volume, insert molding, medical certification, cleanroom + automation |
★★★★☆ |
|
10 |
Weiss-Aug |
1972 |
Precision metal stamping + insert molding, medical/automotive/interconnect certifications, multiple global plants |
★★★★★ |
Conclusion
In summary, each insert molding company has its unique areas of expertise and manufacturing capabilities. Choosing the right partner is crucial to ensuring product quality and production efficiency.
By comparing the business profiles, technical strengths, and customer service of multiple suppliers, companies can find the insert molding company that best meets their specific needs.
Additionally, considering factors such as lead times, material selection, and post-production packaging can help optimize the supply chain and enhance product competitiveness.
Ultimately, selecting an experienced insert molding partner with advanced equipment and comprehensive services will lay a solid foundation for the success of your project.