Mack Inc

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812 N 2nd Ave
Castlewood, SD 57223

Mack is a leading supplier of contract manufacturing services and injection molded plastic parts to companies in various industries. With a strong focus on vertical integration, the company offers a range of services including design development, prototyping, plastic injection molding, finishing, sheet metal machining, and contract manufacturing.

Under the Mack umbrella, there are multiple entities such as Mack Molding, Mack Technologies, Mack Prototype, MackMedical, and Synectic Engineering Services, each specializing in different aspects of the manufacturing process. With a commitment to sustainability and community, Mack operates in multiple locations across the United States, serving clients in the medical, industrial, transportation, energy, environment, computer, and consumer markets.

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