Where We Started

Interlock Industries, Inc. was founded in 1982 when four businessmen joined forces in the ownership of an international manufacturer of custom roofing and siding products. Their mission: diversification through the acquisition of strong, growth-oriented companies. Within three years, holdings included transportation, aluminum billet casting and extrusion, and corrugated packaging companies.

Based in Louisville, Kentucky, Interlock is now privately held by the family of founding member Joseph L. Mackin Jr. 

To date, Interlock employs over 2,000 full-time associates. Interlock and its companies have 30 facilities in 17 different states, and conduct business worldwide.

While the companies currently owned by Interlock represent three different industries, they share management beliefs. Each offers industry leading products and services, supported by first class, highly effective employee teams. Metal Sales Manufacturing Corporation, Procarent, and Ohio Valley Aluminum Company– together, they are the Interlock Industries, Inc. family of companies.

Interlock Industries is dedicated to the continued growth and success of each company by: 1) acknowledging and embracing the diversity of each company, 2) uniting each company under the parent corporation’s umbrella, 3) exhibiting strong, capable leadership and mentoring, 4) providing quality products and services at competitive pricing, 5) using state-of-the-art equipment and highly skilled team members, and 6) building positive relationships with team members, customers and suppliers. These management beliefs guarantee the Interlock Industries’ family – its shareholders, employees and customers – continuity and excellence.

We are a Family committed to integrity, excellence, growth and success for our customers, employees and community.