In the ever-evolving world of custom plastic manufacturing, companies that combine technical capability, operational efficiency, and strategic location stand out. Harbor Plastics, based just west of Minneapolis in Maple Plain, Minnesota, is one such standout. With expansive in-house equipment, a highly trained team, and a proven track record of success—particularly in the demanding automotive industry—Harbor Plastics is a trusted partner for plastic injection molding in Minneapolis and across the country.

Strategic Location, National Reach

Positioned in the Minneapolis–St. Paul metro, Harbor Plastics benefits from a central U.S. location that enables fast and cost-effective distribution to both coasts and Canada. Major interstate highways like I-35 and I-94 provide rapid ground freight access, while proximity to rail and air freight (via Minneapolis–St. Paul International Airport) enhances logistics versatility.

This strategic location allows Harbor Plastics to efficiently serve a nationwide customer base, reducing lead times and freight costs for clients across industries such as automotive, electronics, industrial goods, medical devices, and consumer products.

Equipment-Driven Excellence

Harbor Plastics’ capabilities are driven by an impressive lineup of injection molding equipment. The facility includes:

• Machines ranging from 60 to 500 tons
• Shot sizes up to 51 ounces
• State-of-the-art MA 4700 III – 500 Ton machine for large, complex parts
• Highly automated systems for lights-out manufacturing

This wide range of equipment allows the company to run everything from low-volume prototypes to high-volume production with precision and consistency. Whether customers need small, intricate parts or large-format components, Harbor Plastics has the press capacity and tooling infrastructure to deliver.

The company also supports continuous, lean manufacturing with 24/5 operations, ensuring maximum uptime and fast turnaround times. Clients benefit not only from Harbor Plastics’ ability to mold a diverse range of thermoplastics, but also from their commitment to efficiency, waste reduction, and speed.

In-House Value-Added Services

What sets Harbor Plastics apart isn’t just their molding capacity—it’s their end-to-end capabilities. They provide a comprehensive suite of secondary operations and value-added services, including:

• Ultrasonic welding
• Pad printing
• Heat staking
• Mold building and maintenance
• Assembly and packaging

With these services all under one roof, clients avoid the hassle of managing multiple vendors. This streamlined workflow means faster time-to-market, better quality control, and reduced overall costs.

Harbor Plastics also works closely with customers on mold design and development, helping ensure that parts are manufacturable, cost-efficient, and performance-optimized from the outset.

Automotive Industry Expertise: A Badge of Quality

One of the most impressive validations of Harbor Plastics’ capabilities is their ongoing work in the automotive industry—an arena known for its demanding standards and high expectations.

Serving automotive clients means more than just making parts—it requires:

• Strict adherence to quality systems like IATF 16949
• Deep knowledge of PPAP (Production Part Approval Process) documentation
• The ability to hold tight tolerances and deliver repeatable, high-precision parts

Harbor Plastics has proven itself as a reliable partner in this sector, capable of supporting Tier 1 and Tier 2 suppliers with durable, exacting components for various vehicle platforms.

This expertise gives the company a significant edge when working with clients in other industries as well. Many sectors—such as aerospace, healthcare, and electronics—seek vendors with automotive-grade systems and discipline. Harbor Plastics’ track record makes them a top-tier option for customers needing parts where precision, reliability, and quality are non-negotiable.

Operational Maturity and Long-Term Value

Working with the automotive sector also means Harbor Plastics is well-versed in:

• High-volume manufacturing with tight deadlines
• Just-in-time (JIT) delivery systems
• Integrated supply chain communications and logistics coordination

As a result, the company is not only a skilled molder, but also a savvy logistics partner. Their systems are built for long-term production, consistent delivery, and responsive service—qualities that benefit clients across all industries.

Automotive projects often involve multi-year production commitments and revision cycles, creating predictable, ongoing work. This stability supports Harbor Plastics’ continued reinvestment in new technology, training, and process improvements—all of which further benefit their customer base.

Partnering for Performance

At its core, Harbor Plastics is more than a vendor—they are a partner in performance. With a deep bench of technical knowledge, modern equipment, and integrated manufacturing services, they are well-positioned to solve complex challenges and drive value throughout the product lifecycle.

Clients rely on Harbor Plastics not only for their molding capacity, but for their insight, responsiveness, and commitment to continuous improvement. Whether you're launching a new product, transitioning suppliers, or scaling up a legacy part, Harbor Plastics has the expertise, agility, and infrastructure to help you succeed.

Ready to Mold the Future

Harbor Plastics is helping shape the future of plastic injection molding in Minneapolis and beyond—one precision part at a time. Their unique blend of capability, location, and industry expertise makes them a competitive choice for companies seeking quality, speed, and service in a single, dependable source.

To learn more about how Harbor Plastics can support your next project, contact their team to discuss your specific needs.