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We Are a Custom Precision Plastic Injection Molder – And So Much More

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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Four Process Facility

More Than Just Another Plastic Injection Molder

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.

Communication

The more the better — we ensure alignment and success through open dialogue.

Honesty

We tell you what you need to hear, not just what you want to hear.

Value

We deliver value in every product, service, and insight we provide.

Reliability

We say what we mean and do what we say — every time.

Celebrating 50 Years of Excellence

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.

Our Services

From concept to production and beyond, we offer a full suite of services to support your product lifecycle with precision, flexibility, and reliability.

Precision Injection Molding

Close tolerance engineered plastic parts with consistent quality and on-time delivery.

Custom Inventory Management

Flexible fulfillment solutions to meet short-, medium-, and long-run demands.

On-Site Assembly

Complete assembly, sonic welding, packaging, and component sourcing under one roof.

Transfer & Reshoring

Seamless transition of tooling and production from overseas or legacy suppliers.

Prototyping & Development

From concept to prototype, we help bring your ideas to life quickly and efficiently.

Long-Term Partnerships

We build relationships, not just parts — focused on your long-term success.

Custom Engineered Plastic Parts

We specialize in high-precision, close-tolerance components for diverse industries.

Precision Molded Component

Medical Device Housings

Tight tolerance, biocompatible materials, cleanroom-compliant molding.

Electronic Enclosure

Electronic Enclosures

Durable, EMI-shielded, and precision-fitted for sensitive electronics.

Industrial Component

Industrial Components

High-strength, wear-resistant parts for demanding environments.

Consumer Product

Consumer Product Parts

Aesthetic, functional, and scalable for high-volume production.

Custom Molds

Custom Mold Development

In-house mold design and fabrication for unique applications.

Assembly Components

Assembly Components

Precision-mated parts designed to lock perfectly every time.

Rug Doctor Parts

Rug Doctor Components

High-quality replacement and OEM parts for cleaning equipment.

Arundale Products

Arundale Product Parts

Long-standing partnership producing consistent, high-quality components.

50+

Years in Business

3

Generations of Leadership

ISO 9001:2015

Certified Manufacturing

WOSB

Woman-Owned Small Business

What Our Customers Say

"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

Let’s Partner on Your Next Project

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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