From Powering Railroads to Driving Electrification, Arnold Reflects on a Legacy of Leadership and Future Growth
Rochester, NY: Arnold Magnetic Technologies Corporation (“Arnold”), a leading global manufacturer of high-performance magnets, electric motors and precision thin metals, marks its 130th anniversary in 2025, celebrating a storied history of engineering excellence and a forward-looking approach to innovation. Founded in 1895 by renowned electrical engineer Bion J. Arnold, the company has grown from designing power systems for electric railroads to becoming a global leader in engineered solutions. As a subsidiary of Compass Diversified (CODI), Arnold benefits from the strategic support and leadership of its parent company.
This milestone anniversary comes as Arnold unveils two major investments: the opening of a state-of-the-art facility in Woodstock, IL, and the launch of a new production site in Thailand. These developments underscore the company’s commitment to its customers, employees, and the environment, reflecting its enduring mission to “Engineer Solutions Together.”
“Arnold’s 130-year legacy is built on innovation, collaboration, and continuous improvement,” said Dan Miller, CEO. “Our recent expansions in Woodstock and Thailand showcase how we’re not only honoring our past but also preparing for an exciting future of global growth and technological leadership.”
Arnold traces its roots to the late 19th century, when Bion J. Arnold, a close associate of Thomas Edison and Charles Steinmetz, patented the first magnetic clutch in 1898. This invention revolutionized electric power generation and laid the foundation for decades of advancements. In the 1940s, Arnold contributed to World War II efforts by producing Alnico magnets for Sherman tanks and proximity fuses for motor and anti-aircraft shells.
The post-war years saw further innovation, including the introduction of ceramic magnets, samarium cobalt magnets, precision thin metals, electromagnetics, and bonded magnets used in aerospace, automotive, and medical applications. In 2016, Arnold launched the RECOMA® 35E, the world’s strongest samarium cobalt magnet grade, enabling unparalleled performance in high-temperature environments.
Arnold’s commitment to cutting-edge technology and sustainability continues to drive its growth. Recent highlights include:
- Woodstock Facility: Opening in January 2025, this 130,000-square-foot facility will be the new home for Arnold’s Alnico and Precision Thin Metals divisions. The facility reflects the company’s focus on modernization and efficiency while easing the transition for its team from Marengo, IL.
- Thailand Expansion: In 2024, Arnold opened a 26,250-square-foot manufacturing site in Chonburi, Thailand, producing magnet assemblies, rotors, and motors to meet growing demand in the Asia-Pacific region.
- Technology Centers: With a flagship R&D center in Middleton, WI, and additional locations in Sheffield, UK and Switzerland, Arnold remains at the forefront of innovation in magnetic materials and systems.
As a key supplier for the electrification of transportation, Arnold plays a critical role in advancing sustainable energy solutions. By producing materials for electric vehicles, aerospace, and renewable energy systems, the company is driving change in industries critical to a greener future. With plans to further invest in its employees, facilities, and cutting-edge technologies, Arnold Magnetic Technologies continues to solidify its place as a trusted partner in shaping the future of Aerospace, Defense, Energy, Transportation, and beyond.
About Arnold Magnetic Technologies
Based in Rochester, NY with an operating history of 130 years, Arnold is a leading global manufacturer of engineered solutions for a wide range of specialty applications and end-markets, including aerospace and defense, general industrial, motorsport, oil and gas, medical, and energy. From its Technology Center and manufacturing facilities located in the United States, the United Kingdom, Switzerland, Thailand and China, the company produces engineered magnetic assemblies in addition to high-performance permanent and electromagnets, precision foil products, and highly loaded composites that are mission critical in motors, generators, sensors, and other systems and components. Based on its long-term relationships, the company has built a diverse and blue-chip customer base totaling more than 2,000 clients worldwide. For more information on Arnold, visit https://www.arnoldmagnetics.com.