Why Our Assembly Services?
- Quick Turnaround Times
- Custom Solutions
- Tailored Solutions:
Expert Assembly Services for Plastic Injection Molding Projects
At Ronningen Research & Development, we specialize in precision assembly services that ensure your plastic components meet the highest standards of quality and performance. From simple single-part assemblies to complex multi-component builds, our skilled technicians and automated systems guarantee seamless integration and reliable operation. With over five decades of experience serving Fortune 100 and 500 OEMs, we understand the unique challenges of the injection molding industry and provide tailored assembly solutions to streamline your production. Our advanced facility is equipped with ultrasonic welding, heat staking, and mechanical fastening technology — allowing us to complete even the most intricate assemblies efficiently. Whether you need low-volume prototypes or high-volume production, we deliver consistent, repeatable results that shorten lead times and enhance your product’s reliability. Partner with Ronningen for assembly excellence built on precision, innovation, and industry-leading expertise.
Why Choose Our Plastic Assembly Services
Automated and manual sub-assembly production lines
Ultrasonic welding for precise part bonding
Heat staking for reinforced plastic joints
Leak and pressure testing for assurance
High-speed assembly for mass production efficiency
Strict inspection protocols for consistent results
Call Us Today to Schedule a Free Consultation
Our Expertise Across Assembly Operations
Ronningen Research & Development offers a full range of assembly processes that align with your production goals. By integrating advanced manufacturing technologies and continuous process improvement, we help manufacturers achieve maximum performance and reduced waste. Every assembly is built to match your exact design and functional requirements.
Ultrasonic Welding:
A fast, clean, and precise method for bonding thermoplastic parts without adhesives or screws, ideal for medical and electronic assemblies.
Heat Staking:
Combines heat and pressure to form secure joints between metal inserts and thermoplastic materials for structural strength.
Mechanical Assembly:
Utilizes precision fixtures, fasteners, and alignment systems to assemble complex multi-component products accurately.
Insert Installation:
Our specialized insert molding and installation processes strengthen parts while maintaining aesthetic and dimensional integrity.
Streamline Production with Ronningen’s Assembly Expertise
Take your manufacturing process to the next level with Ronningen Research & Development’s assembly services. Our experienced team ensures each plastic component is assembled with precision, consistency, and care. We provide scalable solutions that reduce rework, improve quality, and accelerate your time to market. Contact us today to discuss your next assembly project and discover why manufacturers across the country trust Ronningen for performance-driven results.
Frequently Asked Questions About Plastic Assembly Services
Clients often inquire about how assembly services can streamline their production process. Here, we answer some of the most common questions about our assembly techniques, from ultrasonic welding to insert molding, ensuring clarity on how each service works and benefits your product.
1. What types of assembly processes do you offer?
We offer a variety of assembly solutions including ultrasonic welding, heat staking, mechanical fastening, and insert installation. Each process is carefully selected based on your material requirements, design complexity, and production volume to ensure the best results.
2. How do you maintain consistent quality in every assembly?
Our quality assurance program follows ISO 9001:2015 standards and includes visual inspections, dimensional verification, and functional testing. Every assembly line is monitored with digital data tracking to maintain consistency and minimize variation.
3. Can Ronningen handle both prototype and large-scale assemblies?
Yes. We support everything from low-volume prototype builds to high-volume production assembly. Our flexible infrastructure and experienced staff make it easy to scale operations as your project grows, maintaining precision at every stage.
4. What industries use your assembly services?
We proudly serve medical, telecommunications, automotive, aerospace, and consumer electronics manufacturers. Our adaptable processes and high-precision technology make us a trusted partner across multiple sectors nationwide.
5. Where are your assembly services available?
Ronningen Research & Development provides assembly services to clients across the United States, supporting both domestic and international production programs. Our facility is strategically equipped to handle complex logistics, ensuring fast delivery and reliable performance wherever you operate.
Our Active Certifications


Our ISO 9001 certified quality management system is registered and certified by NSF International Strategic Registrations and based on a number of quality management principles including:
- A strong customer focus
- Support of top management
- Adherence to a process approach
- Continual improvement
Under the scope of our registration are the following services:
- Prototype plastic injection tooling for molded parts
- Engineering evaluation samples
- Pilot and production plastic components
Our accreditation from NSF provides assurance to our customers that our certified components and products comply with the technical requirements of ISO 9001.
QMMY2.E116158 Fabricated Parts – Component
Underwriters Laboratories is an independent product safety testing and certification organization working for public safety since 1894. Since its founding, U/L has held the reputation as the undisputed leader in product safety and certification, giving consumers peace of mind about the products they use.
Ultrasonic Welding & Sub-Assembly Services for Injection Molding
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.
