Top 10 Injection Molding Companies in USA

Injection molding is a manufacturing process used to make parts and products from plastic and polymer materials. It is one of the most common manufacturing methods today due to its efficiency, consistency, and ability to create complex and intricate components.

The United States injection molding industry generated around $35 billion in 2019 and is a driving force of the country’s manufacturing sector. As the technology advances and production volumes rise to meet increasing consumer demand, injection molding is growing more critical for everything from medical devices to aerospace advancements.

As a professional plastic injection molding manufacturer, I have compiled this list of the top 10 injection molding companies in the USA to showcase industry leaders propelling growth through cutting-edge capabilities, exceptional expertise, and a commitment to innovation. My rankings are based on factors like years in business, advanced machinery, capacity range, certifications, specialties, and services offered.

Top 10 Injection Molding Companies in USA

1. Milacron

Location: Cincinnati, OH

Year Founded: 1868

Employees: 3,000

Services: Complete lifecycle solutions from design to production, including industrial injection molding presses, injection mold components, mold technology parts, process control systems, aftermarket parts and services

Milacron is a globally renowned injection molding leader supplying tailored high-tech solutions to diverse industries since 1868. With over 125 years of expertise and the world’s broadest plastics processing technologies portfolio, Milacron offers complete lifecycle solutions for injection, co-injection, blow molding, thermoforming, and more.

Their unmatched global services network provides parts, support, training, processing expertise, and M2M connectivity. Along with industry-leading brands like Milacron, Mold-Masters, and DME, they provide customized solutions and capabilities unmatched in scale and scope by any single competitor.

2. Nypro

Location: Clinton, MA

Year Founded: 1955

Employees: Over 26,000

Services: Design, molding, assembly, and product manufacturing services. Medical, diagnostics, consumer electronics, telecom, automotive industries

Jabil’s Nypro healthcare division is a leading global solutions provider specializing in the healthcare industry for over 60 years. Nypro provides unmatched high-precision capabilities across the entire product lifecycle spectrum.

With over 150 locations worldwide, 26,000 + diverse employees, and advanced engineering resources, Nypro helps bring integrated product innovations to reality. They offer comprehensive services, including product design, precision molding, assembly, and product manufacturing for industry-leading medical, diagnostics, consumer electronics, telecom and automotive companies.

3. American Precision Products

Location: Pflugerville, TX

Year Founded: 1979

Employees: 200+

Services: Precision injection molding, insert molding, multi-component molding, over-molding, thermoplastic injection molding, liquid silicone molding

American Precision Products (APP) is an industry-leading American manufacturing company supplying custom plastic injection molding solutions and services for over 40 years. Internationally certified to aerospace industry AS9100D quality management standards, APP’s capabilities create components, subassemblies or complete devices for medical, hi-reliability, Defense/Space and commercial applications.

Cutting-edge resources and next-generation facilities allow APP to collaborate with customers as a seamless extension of their team to achieve strategic vision and program objectives through the product life cycle. With complete concept refinement, engineering design, prototyping, validation services, an expansive press tonnage range and cleanroom facilities onsite, APP can guide projects fluidly from inception to reality.

4. HTI Plastics

Location: Erie, MI

Year Founded: 1966

Employees: 400+

Services: Product design, tooling, plastic injection molding, mold building, precision overmolding, contract assembly, pad printing, sonic welding, CNC machining

Founded in 1966, HTI Plastics has been engineering and manufacturing plastic injection molding solutions for over half a century across diverse industries, establishing itself as a premier American large tonnage injection molding company.

With next-generation technology and equipment powering leading-edge 400,000 square foot manufacturing operations, HTI provides complete concept-to-production plastic product engineering, quality assurance and global supply chain management services.

HTI’s customer-centric business model prioritizes collaboration to transform ideas seamlessly into end-user parts, components, or fully integrated product assemblies. With comprehensive solutions spanning initial concept drawings to delivering completed turnkey assemblies, HTI allows customers to benefit from working with an integrated, single-source manufacturing partner.

5. ICO Mold, LLC

Location: Romeo, MI

Year Founded: 1976

Employees: 100 – 250

Services: Plastic injection molding, injection mold manufacturing, mold flow analysis, sampling, pad printing, sonic welding, assembly

In business over 45 years, ICO Mold provides customers full-service injection mold manufacturing, sampling and production services as a collaborative, versatile manufacturing partner since our founding.

Offering complete concept-to-completion project direction, our 100,000 sq. ft. facility houses advanced injection molding machinery from 33 – 770 tons including LSR capabilities, extensive secondary finishing equipment, hyper-efficient Moldflow simulation software and skilled teams of journeymen mold makers, engineers, QA technicians and machine operators with centuries of collective expertise.

By engaging customers as true collaborators, not just clients, ICO Mold delivers high-quality, cost-effective injection molded parts and products made-to-order to precise specifications by optimizing our comprehensive in-house resources to satisfy requirements exactly.

6. Glenn Plastics

Location: Brecksville, OH

Year Founded: 1954

Employees: 60

Services: Custom plastic injection molding, value-added assembly, pad printing, sonic welding, contract packaging, supply chain management

Glenn Plastics is a Cleveland, Ohio based manufacturing leader specializing in precision tight-tolerance injection molding applications and products since our 1954 founding. For over 65 years across diverse industries, Glenn Plastics has built an outstanding reputation creating exceptional value for global customers by merging advanced manufacturing technology with industry-leading expertise.

By housing complete concept-to-production services onsite, including comprehensive secondary department resources, Glenn Plastics functions as a strategic manufacturing ally allowing customers to streamline sourcing and consolidate supply chain management with an integrated partner.

With our recent expansion into a new, state-of-the-art 57,000 square foot facility, Glenn Plastics has the capacity, quality controls, project management and manufacturing velocity to deliver repeatable production runs cost-effectively on-time.

7. Spectrum Plastics Group

Location: Minneapolis, MN

Year Founded: 1989

Employees: 1,000+

Services: Custom plastic extrusions, thermoforming, injection molding, component molding, fabrication, coatings

Spectrum Plastics Group is composed of multiple synergistic plastics companies offering complete concept-to-production services for over 30 years. Our Spectrum Medical division provides specialized engineering and manufacturing capabilities supporting intricate applications across diagnostic, drug delivery, surgical and medical device categories.

By housing best-in-class resources internally for designing, tooling, process engineering, clean room molding and automated assembly in FDA registered facilities with ISO certifications, Spectrum Medical helps leading medical manufacturers expedite intricate projects requiring stringent validations, documentation, reporting and approval processes at each phase.

With 1,000 + dedicated professionals across locations globally working in concert utilizing unified systems and data tracking creating consistency, Spectrum Medical ensures scalability to execute production runs efficiently without quality or compliance concerns.

8. Parkway Products

Location: Fairfield, OH

Year Founded: 1965

Employees: 115

Services: Insert molding, multi-shot molding, overmolding, injection molding, mold building

A family-owned American manufacturer for over 50 years, Parkway Products specializes in precision multi-component molding applications for product developers with exacting specifications. With our newest 38,000 square foot facility and breadth of capabilities, Parkway Products helps industry leaders launch next-generation solutions globally across medical technology, filtration, aerospace, defense, lighting and more.

By housing complete autonomous concept-to-full-production operations in-house, Parkway Products functions as a strategic engineering and manufacturing partner for businesses worldwide seeking to consolidate supply chain and assembly procedures. Our commitment to precision, innovation and process dependability makes Parkway Products a leading American injection molding company delivering against customer expectations routinely.

9. Stack Plastics

Location: Waupaca, WI

Year Founded: 1989

Employees: 130

Services: Custom injection molding, tooling, product engineering, supply chain management, automated assembly

For over 30 years, Stack Plastics has provided full-service custom plastic injection molding through an integrated partnership approach focused on quality, value and industry leadership. Our Waupaca headquarters facility offers complete concept-to-production capabilities all on-site to shorten development, refinement and manufacturing cycles benefitting customers globally.

By continuously investing in next-generation robotics integrating emerging technologies and implementing LEAN methodologies enhancing efficiency, Stack Plastics offers customers speed-to-market accelerating scale. And through coordinated launch strategies and JIT material delivery procedures, our customers can seamlessly transition projects from sampling phases to full consistent run production rapidly and cost-effectively.

10. Baiwe Molding

Location: Industry, CA

Year Founded: 2005

Employees: 150

Services: Plastic injection molding, assembly, finishing, clean room molding, automation, global sourcing, supply chain management

With two decades refining injection molding, assembly and supply chain expertise into industry best practices, Baiwe Molding offers customers an ideal American manufacturing partner allowing domestic and multi-national businesses simplified, stable North American partnerships.

By providingcustomers expanded capacity through China resourcing, controlled oversite both locally and abroad and supply continuity through coordinated efforts, Baiwe Molding delivers escalating project continuity. Our California headquarters location provides customers local engineering, project management and sales contact points functioning as liaisons facilitating enhanced communication streams through language translations and logistical alignments across entities.

So in summary, these top 10 plastic injection molding companies in the USA represent the country’s most capable, specialized and strategically sound options available for component, sub-assembly or fully integrated product manufacturing stateside. Their advanced engineering and production competencies fused with extensive material familiarity empower an elevated aptitude to convert initial visions into realities through synergized collaboration aligned toward shared goals of excellence and innovation.

In Conclusion

The top 10 injection molding companies in USA as outlined offer the sophisticated engineering acumen, newest globally competitive machinery, turnkey project scalability and uncompromising consistency required by leading manufacturers worldwide across pivotal industries progressing humanity positively through pioneering disruption.

By leveraging their transcendent expertise transforming imaginative concepts expeditiously into production-ready breakthroughs, these elite proprietary engineering frameworks catalyze technological revolution through amplified entrepreneurial velocities systematically reducing prohibitive barriers of entry facilitating amplified market disruption uniquely democratizing participation allowing independent innovators fairer chances conceiving tomorrow’s solutions bettering life sustainably for all equally.