About Us

A Plastic Injection Molding Company That Solves Problems and Builds Trust

Sussex IM is a custom plastic injection molding company rooted in Midwestern values and built for modern manufacturing. We deliver dependable, full-service solutions supported by technical depth and real-world experience. From product development through delivery, our team brings hands-on support, consistent quality, and sharp problem-solving to every project.

With more than four decades of experience, we help customers improve manufacturability, streamline supply chains, and reduce time to market – with results that speak for themselves.

Who We Are

Family-owned and centrally located in Sussex, Wisconsin, we run more than 60 presses ranging from 25 to 725 tons. As a fully integrated injection molding manufacturer, we oversee every stage in-house – ensuring quality, transparency, and speed.

Customers work with Sussex IM because we:

Deliver complete plastic injection molding services under one roof
Support projects with cross-functional collaboration and practical insight
Maintain long-term relationships built on trust and follow-through
Bring agility and responsiveness to complex, fast-moving challenges

What Guides Us

At Sussex IM, culture isn’t an afterthought – it’s the reason we operate the way we do. We believe a positive environment drives better outcomes, both for our team and our customers. Our approach is centered on real accountability, teamwork, and creative thinking.

Core Focus

Purpose: To be an essential partner to the world’s best brands
Niche: Injection molding and turnkey solutions

Core Values

If we can, we will… and then some
Own the outcome, share the credit
Work hard, play hard, laugh hard
We’ll figure it out
Treat everyone like family
How can I help?

Capabilities and Capacity

From product development to full-scale production, Sussex IM offers start-to-finish custom injection molding services tailored to your needs.

Our capabilities include:

Design for manufacturing and plastic part design for injection molding
Expert material selection for injection molding
Prototype plastic injection molding and insert molding solutions
In-house automation, multi-shot molding, and decoration
Assembly, packaging, warehousing, and logistics supportWith more than 280,000 square feet of climate-controlled space, we’re equipped to scale quickly while maintaining precision and quality.

Proudly Based In Wisconsin

Located just outside Milwaukee, Sussex IM is proud to be one of the leading injection molding companies in Wisconsin. We take pride in our Midwestern roots, our dependable work ethic, and the long-term partnerships we’ve built along the way.

Let’s talk about your next project – and how Sussex IM can support it from every angle.