Family-Owned Plastic Injection Molding Company

Headquartered in Marshalltown, IA since 1949

Bruin Manufacturing is a family-owned plastic injection molding company, located in Marshalltown, Iowa, in the same spot since our company opened its doors in 1949.

We have a unique approach to plastic injection moldings with our own custom, in-house tool shop. Because of this, we can deliver plastic injection moldings to your exact specifications and requirements, and we can do it with low cost and quick turnaround time.


Bruin MFG Logo


Why Bruin Manufacturing? Learn more about why Bruin Manufacturing has been a trusted source in plastic injection molding for over 70 years.


Bruin MFG Team

At Bruin Manufacturing, we are the small parts problem solvers.

We offer total, integrated custom injection molding services that can meet your needs for quality, time, and price. This top-to-bottom integration means total control over every aspect of your project, from designing plastic injection molds, to turning out top-of-the-line parts with each custom plastic injection molding. We set high standards, and we make certain your parts meet or exceed your expectations.

Lights Out

Bruin Manufacturing offers a wide range of in-house custom injection molding capabilities. Bruin is built on a foundation of solid engineering. Our “lights out” production model relies on total automation, with production meeting the toughest quality standards.

Bruin Manufacturing has integrated a rigorous quality system and equipment to perfect lean manufacturing techniques and to deliver what our customers want and need: quality injection molded parts, quick turnaround time, and cost savings.

Since all aspects of custom plastic injection molding are done on the premises, we are responsible for quality every step of the way. Bruin designs and builds plastic injection molds onsite and we build and maintain our own state-of-the-art molding presses and tooling. We run the parts and are able to immediately solve any production problems that may arise. Bruin Manufacturing is proud to be ISO 9001:2015 registered. It’s just one more way we stand behind our products and services.

Wherever you are in the production process, whatever special injection molding design assistance you require, Bruin Manufacturing can deliver experience and expertise with any custom plastic injection molding project. Our costs are competitive with other companies overseas, and we produce plastic injection molds and parts with unrivaled quality. What’s more, the customer care at Bruin Manufacturing means you are our number one priority. We will respond quickly, with whatever technical help you need, and that makes us the preferred company for all our custom injection molding clients.

Contact us today for more information about custom injection molding!


Headquartered in Marshalltown, IA since 1949

At Bruin Manufacturing, we are the small parts problem solvers. We offer total, integrated custom injection molding services that can meet your needs for quality, time, and price.

About Bruin Manufacturing Our Quality Standards