Contract Assembly of Molded Parts, Wiring and Hardware

Midwest Molding, Inc. combines molded components, wiring, inserts, and hardware into integrated assemblies for demanding manufacturing programs across the United States. From multi-component assembly and wire harnesses to overmolding and insert molding, experienced project engineers support complex designs, process optimization, quality control, and production delivery through one manufacturing partner.

Technicians assembling molded plastic parts, wiring, inserts, and hardware in a manufacturing facility

Our Contract Assembly Services

Integrated molding and assembly capabilities for complex plastic components, wiring, inserts, hardware, and finished manufacturing assemblies.

Multi-Component Assembly

Combine injection molded parts with additional components into complete assemblies. Midwest Molding supports error proofing, redesign optimization, project engineering, and quality-focused production for integrated products.

Wire Harness Assembly

Build wire harness assemblies for automotive, transportation, electronics, and consumer goods applications. Projects are supported by manufacturing engineers, quality systems, and integrated assembly capabilities.

Pre-Mold & Overmolding

Encapsulate pre-existing parts, substrates, or inserts with injected plastic to create multi-component assemblies. Dedicated equipment and quality control systems support consistent production.

Insert & Composite Molding

Combine materials through injection molding to produce complex components with integrated inserts. Engineering support assists with tooling, project management, and process optimization.

Two Shot Molding

Mold multiple materials or colors together in a single cycle for complex components. Midwest Molding supports projects from tool build through production ramp-up with dedicated engineering assistance.

Continuous Strip Molding

Produce injection-molded plastic components in continuous strips fed reel to reel, with integrated quality control, robotics, and project management from prototype tool build through production.

Molding And Assembly

Integrated Assembly From One Partner

Midwest Molding, Inc. helps manufacturers consolidate molded parts, wiring, inserts, and hardware through integrated production capabilities. Multi-component assembly, wire harness assembly, overmolding, insert molding, and two-shot molding support complex product requirements while dedicated project engineers coordinate tooling, process optimization, error proofing, and production needs. This approach helps customers pursue functional assemblies with quality, delivery, service, and cost performance in mind.

Integrated manufacturing assembly combining molded plastic parts, wire harnesses, and hardware
The Midwest Molding Difference

Why Choose Midwest Molding, Inc.?

Connect molding, assembly, engineering, and quality support through one experienced manufacturing provider.

Integrated Capabilities

Access molding, assembly, and welding capabilities from one manufacturing provider for complex integrated products.

Engineering Support

Dedicated project engineers support tooling, process optimization, error proofing, and complex component development.

Certified Systems

Quality and environmental management certifications support production for demanding automotive and manufacturing applications.

Industry Experience

An experienced management team supports long-term growth across automotive, electronics, transportation, and consumer goods manufacturing.

Meet The Manufacturing Team

Experienced professionals support complex molding and assembly programs.

Midwest Molding, Inc. supports manufacturers with integrated plastic molding, assembly, and welding capabilities. The company's experienced management team has an average of more than 35 years of manufacturing industry experience, helping customers address complex component and assembly requirements. Its capabilities span tooling, injection molding, insert and composite molding, two-shot molding, overmolding, wire harness assembly, and multi-component assembly. The company operates from its Bartlett, Illinois manufacturing facility and serves demanding automotive, electronics, transportation, appliance, and consumer goods applications. Its growth focuses on supporting long-term manufacturing relationships through quality, delivery, service, and competitive cost performance.

ExperienceAverage management experience exceeds 35 years
Facility120,000 sq. ft. manufacturing facility
Equipment55 fully electric injection molding machines

Frequently Asked Questions

What is contract assembly of molded parts, wiring and hardware?

Contract assembly combines molded plastic components with wiring, inserts, substrates, and hardware to create complete assemblies. Midwest Molding, Inc. supports multi-component assembly, wire harness assembly, overmolding, insert molding, and related molding processes. These capabilities can help manufacturers coordinate multiple production requirements through one manufacturing provider while receiving project engineering, quality support, and process optimization.

What types of assemblies does Midwest Molding produce?

Can molded parts and wire harnesses be produced together?

What industries does Midwest Molding support?

Does Midwest Molding support tooling and engineering?

What quality certifications does Midwest Molding have?

How does Midwest Molding support complex molded assemblies?

How can I discuss a contract assembly project?

Have Questions About Your Assembly Program?

Talk with Midwest Molding about molded parts, wiring, hardware, and integrated production.

Certified And Recognized

Awards and Recognition

IATF 16949 certification for Midwest Molding

IATF 16949

Quality management certification identified by Midwest Molding.

ISO 14001:2015 certification for Midwest Molding

ISO 14001:2015

Environmental management certification recorded for manufacturing.

ISO 9001:2008 certification for Midwest Molding

ISO 9001:2008

Quality management certification listed in company credentials.

ISO/TS 16949:2009 certification for Midwest Molding

ISO/TS 16949:2009

Automotive quality management certification listed by company.

Delphi Pinnacle Award for supplier excellence

Delphi Pinnacle Award

Supplier excellence award received from Delphi in 2005.

Plan Your Integrated Assembly Project

Share your molded parts, wiring, hardware, or assembly requirements with Midwest Molding, Inc. to begin a project discussion.

Contact Us Today

For immediate assistance, feel free to give us a direct call at 224.208.1110.