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Top-Rated Plastic Injection Molding Services in Milwaukee, WI for All Industries

Ronningen Research & Development proudly offers industry-leading plastic injection molding services to manufacturers across Milwaukee, WI. With more than five decades of experience, we deliver custom molded plastic parts designed for precision, strength, and performance. Whether you’re in the medical device, automotive, or electronics sector, our solutions are built to elevate your manufacturing capabilities and meet even the most complex engineering requirements.
Every project starts with understanding your vision—from prototype injection molding and mold design to full-scale production and assembly. Ronningen uses high-performance thermoplastics, Six Sigma production standards, and ISO 9001:2015-certified processes to ensure accuracy, repeatability, and quality control in every molded part. For companies in Milwaukee looking for fast lead times, reliable results, and engineering support, Ronningen Research & Development is your trusted injection molding partner.

Milwaukee’s Go-To Manufacturer for Quality Molded Plastic Parts

At Ronningen Research & Development, quality and speed go hand-in-hand. Our Milwaukee injection molding services are powered by a fleet of advanced molding machines ranging from 7.7 to 1100 tons, capable of handling projects of any size or complexity. With these tools, we serve both startups and Fortune 500 companies in Milwaukee, helping them reduce downtime, minimize part defects, and get to market faster.We apply strict ISO 9001:2015 quality controls, real-time monitoring, and Six Sigma lean manufacturing practices throughout our process. Our goal is to ensure that every plastic component meets your specifications—no matter how demanding. Whether you need short-run prototypes or high-volume molded parts, Ronningen ensures total accuracy and on-time delivery for all Milwaukee manufacturing clients.

Custom Injection Molding Solutions for Milwaukee Manufacturers

Ronningen Research & Development provides a full range of plastic injection molding services for Milwaukee, WI businesses. We offer design assistance, material selection, custom tooling, prototype production, and mass manufacturing—all managed under one roof. This vertical integration allows us to maintain tighter control over quality and cost, while ensuring seamless project execution.In addition to traditional molding, Ronningen specializes in complex services like over molding, insert molding, ultrasonic welding, and structural foam molding. For manufacturers in Milwaukee seeking high-strength, multi-functional components, our advanced molding techniques and material science expertise deliver real value. We also provide assembly, hot stamping, pad printing, part marking, and other finishing services to complete your plastic part production in-house.

Why Choose Ronningen for Plastic Injection Molding in Milwaukee, WI

Ronningen Research & Development has earned the trust of manufacturers across Milwaukee by consistently delivering top-tier plastic molded components on time and within budget. Our experienced engineering and production teams use high-tech molding equipment and software to optimize part geometry, reduce cycle time, and maximize material performance.We offer transparent communication, detailed project tracking, and full compliance with ISO and UL standards. From early-stage development to nationwide product distribution, we help Milwaukee-based clients overcome production bottlenecks and scale efficiently. If you’re seeking an injection molding partner in Milwaukee that values innovation, speed, and quality, Ronningen is the clear choice

Ronningen Serves Milwaukee and All of Southeast Wisconsin

Headquartered in the Midwest, Ronningen Research & Development proudly supports clients throughout Milwaukee and the surrounding areas of Southeast Wisconsin. From Wauwatosa and West Allis to Oak Creek and Brookfield, we offer fast-turnaround injection molding solutions built for real-world industrial demands.
Our commitment to quality, customer support, and manufacturing efficiency makes us the preferred partner for both new product developers and established OEMs in the Milwaukee region. Whether you’re building your first prototype or scaling national production, Ronningen is equipped to guide your success every step of the way.
Certifications

Our Certifications

ISO 9001:2015
Quality Management System
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U/L CERTIFIED
Product Safety Testing
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ITAR REGISTERED
22 CFR 120-130
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MBP3 MEMBER
Pollution Prevention Partner
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Our Comprehensive Manufacturing Services: Plastic Injection Molding & More

At Ronningen Research and Development, we specialize in providing high-quality, precision-driven manufacturing solutions tailored to your needs. With over 50 years of experience, our expertise in Plastic Injection Molding and other manufacturing services ensures we meet the most demanding industry standards. Our wide range of services is designed to reduce your time-to-market, improve product quality, and streamline production processes. Below, explore the services we offer and see how we can help your business grow:

Assembly & Sub-Assembly

At Ronningen Research and Development, we provide expert Assembly & Sub-Assembly services for seamless integration of components. Whether it's simple assemblies or complex multi-part solutions, we ensure precision and efficiency in every process.

Custom Coloration

Our Custom Coloration services offer tailored color options to meet your design and branding needs. We use advanced Plastic Injection Molding techniques to ensure long-lasting, consistent colors for your products.

Custom Cutting Parts

Ronningen Research and Development specializes in Custom Cutting Parts using state-of-the-art machinery. We provide accurate cuts for a variety of materials, meeting the specific needs of your project.

Drilling

We offer high-precision Drilling services to create exact holes in various materials. Our advanced equipment ensures accuracy and quality for projects requiring tight tolerances and consistent results.

Electroplating

Our Electroplating services enhance part durability and corrosion resistance with high-quality metallic coatings. We provide superior finishes for applications in automotive, electronics, and more.

Heat Staking

Heat Staking at Ronningen Research and Development creates strong, reliable bonds between plastic components without the need for additional materials. This process is ideal for parts requiring secure assembly and durability.

Hot Stamping

Hot Stamping services provide a high-quality finish with precision and efficiency. We use advanced techniques to apply logos, designs, and text to parts, ensuring a clean and lasting imprint.

Insert Molding

Insert Molding allows us to mold plastic around metal or other materials to create strong, integrated components. This service provides enhanced functionality and durability for complex applications.

Labeling

We provide precise Labeling services that ensure clear, durable markings for traceability, branding, and compliance. Our labeling process guarantees that your parts are correctly identified and meet industry standards.

Leak Testing

Our Leak Testing services verify the integrity of your products, ensuring they meet safety standards. We provide airtight and watertight testing to prevent failures and guarantee quality.

Machining

We offer high-precision Machining services for custom parts. Using advanced CNC equipment, we deliver consistent, high-performance components for a variety of industries.

Milling

Our Milling services create intricate parts with high accuracy. We use advanced equipment to ensure precise cuts and finishes for your custom projects.

Over Molding

Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.

Packaging, Custom

Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.

Pad Printing

We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.

Over Molding

Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.

Packaging, Custom

Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.

Pad Printing

We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.

Part Marking

Our Part Marking services at Ronningen Research and Development ensure clear and accurate markings for identification and traceability. We use advanced techniques to apply markings that meet industry standards.

Painting

At Ronningen Research and Development, our Painting services enhance the aesthetic and protective qualities of your parts. We apply durable coatings for both functional and cosmetic purposes.

Silk-screening

We offer Silk-screening services at Ronningen Research and Development for durable, high-quality prints on parts. This process is ideal for logos, designs, and labels, providing precise results for a variety of materials.

Shielding

Our Shielding services at Ronningen Research and Development protect components from electromagnetic interference. We use advanced materials and techniques to ensure reliable performance and compliance with industry standards.

Shipping

At Ronningen Research and Development, we handle Shipping with care, ensuring that your products are securely packaged and delivered on time. Our reliable shipping services help you get your products to the market quickly and safely.

Spin Welding

Spin Welding services at Ronningen Research and Development provide strong, durable bonds for plastic parts. This technique is ideal for creating seamless joints without the need for additional materials.

Structural Foam Molding

We offer Structural Foam Molding at Ronningen Research and Development for lightweight, durable plastic parts. This service provides strong components with a reduced weight, ideal for applications that require high strength without the added bulk.

Taping

Our Taping services at Ronningen Research and Development are designed to provide secure adhesion and protection for your products. We offer custom taping solutions to meet the needs of various industries.

Trimming

At Ronningen Research and Development, we provide Trimming services to finish and refine your parts. Our precise trimming process ensures clean edges and perfect finishes for your molded components.

Ultrasonic Welding

Ultrasonic Welding at Ronningen Research and Development uses high-frequency sound waves to create strong, precise bonds between plastic parts. Ideal for delicate applications, this process ensures high-quality, durable results without the need for adhesives.

Frequently Asked Questions About Injection Molding in Milwaukee, WI

Considering plastic injection molding for your Milwaukee project? Here are some detailed answers to the most common questions our Wisconsin clients ask.
What types of plastic parts can Ronningen manufacture for Milwaukee industries?
Ronningen manufactures everything from small-scale electronic enclosures and medical housings to heavy-duty automotive and industrial components. Our injection molding services in Milwaukee, WI are customized to support your part’s intended function, environment, and industry-specific requirements.
Yes. We offer fast-turnaround prototype injection molding for Milwaukee businesses that need short-run testing or pre-production evaluation. This service is ideal for improving product development timelines and validating designs before committing to large-scale tooling investments.
We carry over 250 thermoplastics including ABS, polycarbonate, polypropylene, nylon, and engineering resins. Milwaukee clients can also request customer-supplied materials. Our team helps evaluate each resin’s chemical, thermal, and mechanical properties to ensure long-term part performance.
Ronningen uses ISO 9001:2015-certified processes, Six Sigma principles, and automated inspections to verify every part’s dimensions and structural integrity. Milwaukee clients benefit from our real-time quality monitoring and traceability systems across every production batch.
Lead times vary depending on part complexity, mold status, and volume. Prototypes can be delivered within days, while standard production runs are scheduled promptly. Ronningen is known across Milwaukee for quick turnaround times without compromising on quality.