(636) 940-9988

Office / Direct


St. Charles, MO

Our Location

About Patterson Mold & Tool


Established in 1978, Patterson Mold and Tool, LLC, is located in St. Charles, Missouri. Our QMS systems are certified for AS9100 and ISO9001, and we are ITAR registered. Our multiple facilities operate three shifts to provide capacity to serve a wide range of industries.

Originally founded in 1978, Patterson Mold & Tool was formed by brothers Stan & Ralph Patterson. Stan was a tool maker by trade and Ralph had been working as a Test Engineer for McDonnell Douglas. From the first old brick building on Arlington Ave. to our current modern and spacious facilities, Patterson Mold & Tool has a history of growth through customer service and product excellence.

Our Business Units

Our Mission

At Patterson, our mission is to provide exceptional tool and die, machining, and engineering solutions while maintaining a strong commitment to continuous improvement. We strive to optimize our operations through the principles of 6S, value stream mapping, ongoing employee training and development, and the effective utilization of key performance indicators (KPIs).

Quality Commitment

We are dedicated to a culture of continuous improvement, fostering innovation, and embracing change. By consistently challenging ourselves to find better ways of doing things, we ensure that our customers receive the highest quality products and services. We invest in ongoing training, stay updated with industry advancements, and encourage the exchange of ideas among our team members, all in pursuit of excellence.

We adopt the principles of 6S in every aspect of our operations. Through Sort, Set in Order, Shine, Standardize, Sustain, and Safety, we create a clean, organized, and efficient work environment that promotes productivity and minimizes waste. By eliminating unnecessary steps and optimizing workflows, we enhance the overall efficiency and quality of our processes, ultimately benefiting our customers.

We employ value stream mapping techniques to identify and streamline the flow of materials, information, and activities throughout our organization. By mapping out the entire value stream, from customer requirements to product delivery, we eliminate non-value-added steps, reduce lead times, and enhance overall operational efficiency. This enables us to deliver products and services that precisely meet our customers’ needs, while minimizing waste and maximizing value.

We leverage key performance indicators to measure our performance and track progress towards our goals. By defining clear KPIs, we ensure transparency, accountability, and continuous monitoring of our operations. These metrics enable us to make data-driven decisions, identify areas for improvement, and maintain a focus on delivering exceptional value to our customers. We regularly review and analyze our KPIs to drive meaningful changes that align with our commitment to excellence.

Our Facilities

Patterson Building Exterior
Machine shop floor - Patterson

Patterson Mold & Tool’s main building is a custom built, 53,000 square foot facility on a six-acre site. Our main building has multiple machining capabilities and bridge cranes with capacities up to 25 tons.

Patterson Building Exterior
Patterson Building Interior

Our Patterson Machining Technologies building is a 16,000 sq. ft facility for low to mid volume precision component machining, polishing, and parts assembly.

Patterson Mold and Tool Buildings

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