Top 15 Plastic Injection Molding Companies Serving the USA

Discover the top plastic injection molding companies available in the USA. Compare their services, quality, & more to find the ideal manufacturing partner.

​Injection molding is a highly efficient manufacturing process that involves filling molten plastic into a mold cavity for solidification, resulting in the mass production of complex plastic parts with high precision and consistency. 

This technique is widely employed across various industries, including automotive, consumer electronics, and packaging. Currently, the United States serves as a major hub for trading injection-molded products with a market value of $62.2 billion. Despite this, production is predominantly concentrated in the Asia-Pacific region, which holds a revenue share of over 39.0%, with countries like China in the lead of manufacturing volume.

As such, we will introduce some of the best plastic injection molding companies that offer services in the United States, highlighting their capabilities to help businesses tap into this thriving market.

List of the Top 15 Plastic Injection Molding Companies

Here are the companies that the article will cover:

1. DAYIN
2. GSH Industries, Inc.
3. Britech Industries
4. Hi-Rel Plastics & Molding
5. Extreme Molding
6. ACE Tool & Die Engineering
7. ACO Mold
8. Proto Labs, Inc.
9. MSI Mold
10. Four Process, Ltd.
11. Valencia Plastics, Inc.
12. Maryland Plastic
13. Aline Components, Inc.
14. CMP Custom Molding, Inc.
15. Cascade Engineering

You can also check out this article for an in-depth guide to the injection molding process:
👉Injection Mold Manufacturing: What Is It & How Does It Work? 

1. DAYIN

• Business Type: Custom Plastic Products Manufacturer / Original Equipment Manufacturer (OEM)
• Year Founded: 2004
• Location: Guangdong, China and Vietnam
• Key Services: ODM/OEM services covering mold design and manufacturing, injection molding, production assembly, electronic assembly and testing, secondary processing, quality inspection, etc.
• Website: Browse Now 

DAYIN’s Company Profile:

With over 20 years of experience, DAYIN stands as a comprehensive solution provider in the plastic injection molding industry, offering end-to-end services from initial design and mold creation to mass production, post-processing, and final assembly. It even has a dedicated R&D division with more than 50 experts, helping clients create innovative product features and APP integrations to meet evolving market demands, as seen in their robust portfolio of over 100 patents.

While the main facility is in Guangdong Province, China, DAYIN has expanded to Bac Ninh Province, Vietnam in 2024. Boasting a total factory area exceeding 50,000 square meters, the company operates more than 100 injection molding machines across these facilities. 

The dual location provides strategic advantages, including quick, cost-effective services and supply chain flexibility for global customers. Hence, clients can usually expect completion within 4-8 weeks from preliminary development. Plus, their advanced setups allow DAYIN to manufacture a wide range of plastic components for vehicles, electronics, or more consumer goods that can be found across Walmart, Decathlon, and other mass-chain stores in the US. 

Another key advantage of DAYIN lies in its commitment to quality and efficiency. The custom plastic injection molding company implements cutting-edge scientific techniques like DFM planning, mold flow analysis, and real-time parameter monitoring to enhance production precision, while their pioneering aluminum mold allows for faster cycle times. Moreover, DAYIN is certified under ISO9001, IATF 16949, and multiple international standards. This ensures superior products and makes them a reliable partner for diverse projects.

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2. GSH Industries, Inc.

• Business Type: Custom Injection Molding Manufacturer
• Year Founded: 1986 
• Location: Ohio, USA
• Key Services: Injection molding, plastic extrusions, aluminum extrusions, rubber extrusions, fabrication, etc.
• Website: Browse Now 

GSH Industries’s Company Profile:

GSH Industries is a trusted provider of plastic, rubber, and aluminum extrusions, as well as custom molding for construction, automotive, and consumer goods. It sets itself apart with its expertise in tooling and secondary equipment development, allowing for the production of complex extruded profiles, from simple tubes to intricate custom designs. 

Additionally, GSH prioritizes strong relationships with both customers and employees, ensuring high-quality products, along with competitive pricing and on-time delivery. The company is also deeply engaged with its local community, actively supporting neighborhood initiatives and maintaining a strong presence in the Strongsville Chamber of Commerce.

3. Britech Industries

• Business Type: Injection Molding Manufacturer
• Year Founded: 1984
• Location: Florida, USA
• Key Services: Rubber molding, rubber extrusions, plastic extrusions, and injection molding
• Website: Browse Now 

Britech Industries’s Company Profile:

Britech Industries specializes in custom rubber and plastic components. The company provides a diverse range of services, including rubber extrusion, molded rubber production and plastic extrusion, and injection molding using advanced resins. It is particularly known for its expertise in rapid injection molding, allowing customers to produce low-volume, custom thermoplastic parts efficiently and economically.

Furthermore, Britech’s commitment to quality and quick turnaround times ensures reliable delivery of high-precision components, whether it’s for aerospace, medical, automotive, or consumer goods. It also has a strong reputation for customer service, prioritizing client collaboration through design support and customized solutions to meet exact project specifications. 

4. Hi-Rel Plastics & Molding

• Business Type: Custom Plastic Injection and Blow Molded Products Manufacturer
• Year Founded:1985
• Location: California, USA
• Key Services: CNC machining, prototyping, injection molding, color matching, and pad printing
• Website: Browse Now 

Hi-Rel Plastics & Molding’s Company Profile:

Hi-Rel Plastics & Molding takes a precision-focused approach to custom plastic injection and blow molding, catering to industries with stringent requirements, such as medical, aerospace, military, and scientific research. 

This company is known for its ability to process a vast range of thermoplastic resins, including engineering-grade materials like PEEK, ULTEM, and PVDF. It also has an ISO 7 (Class 10,000) clean room for high-purity manufacturing and its processes processes achieve tight tolerances of up to ±0.001 inches while maintaining an impressively low rejection rate for complex molding projects.

5. Extreme Molding

• Business Type: Plastic Injection Molding Manufacturer
• Year Founded: 2002
• Location: New York, USA
• Key Services: Plastic injection molding, liquid silicone injection molding, over-molding, packing, and fulfillment
• Website: Browse Now 

Extreme Molding’s Company Profile:

As one of the most renowned women-owned silicone injection molders in the USA, Extreme Molding is led by industry veterans Lynn Momrow-Zielinski and Joanne Moon Duncan, who bring over 60 years of combined experience in materials science and manufacturing. 

The company was a pioneer in over-molding Eastman Tritan co-polyester with silicone, offering a BPA-free alternative to polycarbonate. With a Class 100,000-rated cleanroom and a workforce spanning three shifts, Extreme Molding also ensures precision, efficiency, and flexible production capacities. Besides, their customer-centric approach and technical innovation make them a trusted partner for consumer and life science product manufacturing.

6. ACE Tool & Die Engineering

• Business Type: Plastic Mold Manufacturer
• Year Founded: 2002
• Location: Shenzhen, China
• Key Services: High-precision molds, tooling, and part assembly for injection molding
• Website: Browse Now 

ACE Tool & Die Engineering’s Company Profile:

ACE Tool & Die Engineering has provided high-precision mold manufacturing and injection molding services to a global clientele for over 25 years. The company offers a wide range of molds, including injection molds, family molds, over-molds, and die-casting solutions. 

With a strong focus on quality, ACE utilizes world-class machining equipment, such as Roders CNC, Fanuc, and Zeiss inspection machines. It also prides itself on fast turnaround times, delivering the first samples of medium-sized tools in as little as 30 working days. On top of that, their international presence enables them to address regional challenges effectively, cementing their reputation as a reliable and responsive partner.

7. ACO Mold

• Business Type: Custom Injection Molding Manufacturer
• Year Founded: 2003
• Location: Shenzhen, China
• Key Services: Custom injection mold fabrication and product molding
• Website: Browse Now 

ACO Mold’s Company Profile:

ACO Mold, based in Shenzhen, China, offers one-stop injection mold and molding services which span from part design and prototyping to manufacturing, finishing, and logistics. They also adhere to international standards like HASCO and DME.

By focusing on continuous improvement and reliable supply chains, ACO Mold delivers cost-saving and high-value services, fostering long-term partnerships with clients across more than 20 countries, especially in Europe and North America.

8. Proto Labs, Inc.

• Business Type: Custom Plastic Injection Molding Manufacturer
• Year Founded: 1999
• Location: Minnesota, USA
• Key Services: CNC machining, injection molding, 3D printing, sheet metal fabrication
• Website: Browse Now 

Proto Labs’s Company Profile:

Proto Labs, founded in 1999, pioneered rapid prototyping and on-demand manufacturing by automating traditional processes with proprietary software. Leveraging digital technology, Proto Labs significantly reduces production timelines, enabling quick-turn prototyping and low-volume production. Their real-time manufacturability analysis and online quoting system also streamline the process, providing clients with efficient and cost-effective solutions.

Nowadays, Proto Labs’ acquisition of Hubs (now Protolabs Network) expanded their capabilities, offering access to a global network of over 250 vetted manufacturing partners. With this, they empower companies to bring their ideas to market faster than ever.

9. MSI Mold

• Business Type: Custom Injection Molding Manufacturer
• Year Founded: 2005
• Location: Michigan, USA
• Key Services: Plastic injection molding, prototyping, design and engineering, and assembly
• Website: Browse Now 

MSI Mold’s Company Profile:

Established in 2005 as an engineering and consulting firm for the Detroit automotive sector, MSI quickly evolved to meet growing industry demands. By 2009, the company extended into mold engineering changes and trials, eventually becoming a full-service manufacturer.

With a state-of-the-art facility, the company leverages advanced technology, including climate-controlled CMM inspection and high-speed 4-axis machining, ensuring superior quality and efficiency as it focuses on lean manufacturing and customer satisfaction. 

10. Four Process, Ltd.

• Business Type: Plastic Injection Molding Manufacturer
• Year Founded: 1974
• Location: Missouri, USA
• Key Services: Injection molding, inventory management, prototyping, part assembly, sonic welding, and product testing
• Website: Browse Now 

Four Process’s Company Profile:

Four Process is a third-generation family business with over 50 years of industry expertise. They emphasize their “4Ps”—strong communication, honesty, value, and reliability—to take a hands-on, problem-solving approach and build lasting client relationships.

Operating from a 23,000 square-foot facility in Valley Park, Missouri, they offer broad molding capabilities, a quality lab, and robotic automation. Their ISO 9001 certification further outlines their capability to manage customer needs and the product lifecycle. 

11. Valencia Plastics, Inc.

• Business Type: Custom Injection Molding and Blow-Molded Parts Manufacturer
• Year Founded: 2000
• Location: California, USA
• Key Services: Blow molding, plastic injection molding, mold making
• Website: Browse Now 

Valencia Plastics’s Company Profile:

Established in 2000, Valencia Plastics caters to diverse sectors including medical, military, aerospace, and food industries. They pride themselves on supporting inventors from concept to market through services that encompass design, engineering, manufacturing, and distribution.

The company distinguishes itself through its commitment to sustainability, especially with the option of producing high-quality plastic components with 100% post-consumer resin as an environmentally friendly effort. By combining these advanced manufacturing techniques with a customer-centric approach, Valencia Plastics ensures that every product meets stringent industry standards while delivering affordable solutions on time and within budget.

12. Maryland Plastic

• Business Type: Plastic Injection Molded Packaging Manufacturer
• Year Founded: 1950
• Location: Maryland, USA
• Key Services: Plastic injection molding for encapsulation enclosures, epoxy shells, and bobbins, as well as custom plastic part machining, and epoxy rod casting
• Website: Browse Now 

Maryland Plastic’s Company Profile:

For nearly 70 years, Maryland Plastic Products, a division of Maryland Ceramic & Steatite Company, Inc., has specialized in manufacturing molded plastic products for electronic packaging. Their expertise lies in encapsulation cases, utilizing durable Diallyl Phthalate (DAP) and offering customization options like holes, standoffs, and inserts.

Besides that, the company operates three key departments: Swiss Screw Machining, Injection Molding, and Cast Epoxy Rod production. Their injection molding capabilities range from 30 to 200-ton machines, handling various thermoplastics with rapid turnaround times. They also provide custom fabrication, machining, and secondary services such as drilling, milling, and bonding inserts for production versatility. 

13. Aline Components, Inc.

• Business Type: Thermoplastic Injection Molding Manufacturer
• Year Founded: 1965
• Location: Pennsylvania, USA
• Key Services: Design, tooling, and injection molding
• Website: Browse Now 

Aline Components Company Profile:

Aline Components is a trusted custom plastic injection molding company based in Kulpsville, PA. It provides full-service thermoplastic manufacturing, handling everything from design and prototyping to tooling and final production—all in-house. Their advanced facility is equipped with state-of-the-art machinery and CAD technology, ensuring precise, high-performance plastic components for diverse industries.

With ISO 9001 compliance, Aline emphasizes quality, efficiency, and cost-effectiveness, tailoring innovative solutions to meet the unique demands of each customer, whether it is for small-batch or large-scale production. 

14. CMP Custom Molding, Inc.

• Business Type: Custom Plastic Molding Manufacturer
• Year Founded: 1997
• Location: Minnesota, USA
• Key Services: Insert molding, pad printing, hot stamping, silk screening, in-mold labeling, assembly, and packaging
• Website: Browse Now 

CMP Custom Molding’s Company Profile:

CMP Custom Molding Inc. is a family-owned plastic injection molding company with over 40 years of industry expertise. Established in 1997, CMP specializes in producing high-quality plastic components for a variety of industries, offering both small and large production runs with competitive pricing and short lead times.

CMP works closely with customers throughout the design and manufacturing process, providing assistance with mold development and ensuring all specifications are met, even when using commodity or engineering-grade plastics. They also cater to inventors, offering flexible production options and personalized support.

15. Cascade Engineering

• Business Type: Plastic Manufacturer and Marketer
• Year Founded: 1973
• Location: Michigan, USA
• Key Services: Large-part injection molding, engineering, material handling, waste management, and recycling
• Website: Browse Now 

Cascade Engineering’s Company Profile:

With six state-of-the-art facilities and 37 presses, Cascade Engineering specializes in large-scale plastic injection molding, serving industries such as infrastructure, automotive, furniture, and waste management with high-performance, value-driven solutions. 

As a certified Women’s Business Enterprise (WBE), Cascade Engineering is committed to diversity, sustainability, and innovation. The company actively incorporates recycled materials into its products, reinforcing its environmental responsibility. It also operates under a Triple Bottom Line (People, Planet, Profit) philosophy, prioritizing efficiency, quality, and social impact in every aspect of their business.

Comparing Top Plastic Injection Molding Companies

For your reference, here is a quick comparison of the plastic injection molding companies listed in the article:

What to Look for in a Plastic Injection Molding Manufacturer? 

Evaluating these factors will help businesses select a plastic injection molding manufacturer that aligns with their project needs and long-term goals: 

• Service Scope: A broad service range ensures a streamlined production process. A full-service manufacturer should offer design assistance, prototyping, mold making, injection molding, assembly, and secondary operations like welding or decorating.
  
• Experience & Expertise: Companies with decades of operation often possess deep industry expertise and a proven track record thanks to their refined processes and problem-solving capabilities. They also understand the nuances of various materials and manufacturing techniques, ensuring high-quality output.
  
• Technological Capabilities: Advanced machinery, automation, and modern software for design and quality control enhance production efficiency, as well as precision, especially when the project requires complex parts with tighter tolerances.
  
• Certifications & Compliance: Adherence to industry standards, such as ISO 9001 for quality management, indicates a commitment to regulatory compliance and consistency. There are also specific industry regulations, like those for automotive components, that businesses should look out for when creating products.
  
• Client Portfolio: Notable clients and successful past projects are positive indicators. Plus, a diverse client base reflects a company’s ability to meet various requirements and quality standards in different sectors.
  
• Production Scalability: The ability to handle both low or high production volumes while maintaining short lead times and consistent quality is essential for businesses with fluctuating demand.
  
• Global Reach: A manufacturer with international capabilities can support businesses with worldwide distribution needs, ensuring logistical flexibility and potentially reduce shipping costs.

Partner with the Leading Custom Plastic Molding Manufacturer

DAYIN offers a compelling solution for businesses seeking a dependable partner for complex plastic injection molding projects. Not only do we deliver comprehensive services from concept to completion, but we also boast a proven track record of innovation, extensive manufacturing capabilities, and a commitment to quality. Our strategic dual-location setup, combined with advanced equipment further allows for customer satisfaction through quick lead times and scalable production volumes.

Ready to bring your vision to life? Contact DAYIN today to discuss your project requirements or request a custom quote.

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