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For over 50 years, Four Process LTD has evolved from a tooling foundry into a trusted partner for precision injection molding, assembly, and supply chain solutions — all made in the USA.
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At Four Process, your business is our business. We take a proactive, hands-on approach — from mold making to finished product — solving challenges so you have peace of mind throughout your product’s lifecycle.
The more the better — we ensure alignment and success through open dialogue.
We tell you what you need to hear, not just what you want to hear.
We deliver value in every product, service, and insight we provide.
We say what we mean and do what we say — every time.
In 2024, we celebrated our 50th anniversary — a milestone made possible by our employees, customers, and suppliers. Thank you for being part of our journey.
From concept to production and beyond, we offer a full suite of services to support your product lifecycle with precision, flexibility, and reliability.
Close tolerance engineered plastic parts with consistent quality and on-time delivery.
Flexible fulfillment solutions to meet short-, medium-, and long-run demands.
Complete assembly, sonic welding, packaging, and component sourcing under one roof.
Seamless transition of tooling and production from overseas or legacy suppliers.
From concept to prototype, we help bring your ideas to life quickly and efficiently.
We build relationships, not just parts — focused on your long-term success.
We specialize in high-precision, close-tolerance components for diverse industries.
Tight tolerance, biocompatible materials, cleanroom-compliant molding.
Durable, EMI-shielded, and precision-fitted for sensitive electronics.
High-strength, wear-resistant parts for demanding environments.
Aesthetic, functional, and scalable for high-volume production.
In-house mold design and fabrication for unique applications.
Precision-mated parts designed to lock perfectly every time.
High-quality replacement and OEM parts for cleaning equipment.
Long-standing partnership producing consistent, high-quality components.
Years in Business
Generations of Leadership
Certified Manufacturing
Woman-Owned Small Business
"Four Process is not just a supplier to Rug Doctor, they are a dedicated and valued partner. Their commitment to excellence in quality and service is top notch. With their commitment, expertise and continued support, Rug Doctor was able to quickly move a project from China to Four Process, which greatly improved the quality and lead times of our products."
— Alicia McCoy, Rug Doctor
"Our family-owned company, Arundale Products, has been working with Four Process for over 20 years. Their on-time production, excellent quality parts, and team that anticipates our needs and goes the extra mile has created one of the best vendor relationships we have. We are proud to say our products are molded in the USA — specifically in MO."
— Anne Taussig, Arundale Products
We look forward to hearing from you and welcome the opportunity to support your injection molding needs.
Email: sales@fourprocessltd.com
Phone: 636.677.5650
Address: 595 8th Street, Valley Park, MO 63088
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