MAC – Nondestructive Testing Leader Since 1928


MAC’s manufacturing, research, engineering, and home office in Elmsford, New York, US

Magnetic Analysis Corporation has over eighty-five years experience as a leader in non-destructive testing. The company developed the first American made system using electromagnetic principles for the detection of flaws in steel products. Since then, MAC has grown to become a major source of NDT services and eddy current, electromagnetic, flux leakage and ultrasonic inspection systems for testing metals worldwide.

Dedicated to a production oriented approach to testing, MAC offers both individual instruments and complete systems that incorporate materials handling and controls as well as non-destructive testing. MAC’s focus on the client’s concern for reliability and simplicity of design, with minimal need for operator supervision, has evolved from the company’s years of in-plant experience.

The results may be seen in plants throughout the world where wire, tubing, bars and metal parts roll through automatic inspection systems without missing a beat. With MAC field engineers and experienced representatives located throughout the United States, and in Europe, Eastern Europe, Turkey, Russian, Brazil, Chile, China, India, Korea and Australia, MAC’s commitment to service rates second to none.

Backing up this field staff are some of the top specialists in each area of technology, based in MAC’s ISO 9001-2008 certified manufacturing and engineering facility in Elmsford, New York; ISO/IEC 17025:2005 laboratory certified plant in Boardman, Ohio; and M A Nordic’s manufacturing plant in Östersund, Sweden.

MAC instruments and systems are designed to meet the individual needs of customers. Engineers work to define the best test system to meet the customer’s specifications and expert technical assistance is provided during installation to ensure superior performance. Maintenance service can be provided for most systems by a service contract, or on a per call basis.

MAC testers and service are also offered at minimum cost and risk through the company’s unique leasing program, which includes both equipment and service in one package.


Magnetic Analysis Corporation was founded in 1928 in Long Island City, NY, USA, by William Gould and William Gould Jr. to develop a group of patents for nondestructive electromagnetic testing of steel bars. At the time, most inspection consisted of “sampling” techniques which essentially destroyed part of the bar in the process. A test that allowed use of the product after testing was a very attractive and successful idea.


Original 60 Hz electromagnetic instrument detecting cracks in cold drawn bar at Union Drawn Steel in 1936

Translating the NDT concept into a viable tester took six years of research and development, leading to MAC’s 1934 introduction of the first successful nondestructive tester to identify cracks in steel bars. Using two coils and a galvanometer, the system applied an electric AC field to the bar and measured changes in permeability. Housed in a wooden box, this strange new scientific development met with considerable skepticism from early customers. But MAC believed so strongly in the tester that they offered the equipment on a lease basis so the customer would not have to make a capital investment.

With this incentive, Union Drawn Steel became the first company to install a MAC electromagnetic tester in 1934, and MAC’s concept of an operating lease for nondestructive test equipment became a successful part of MAC’s marketing program – one that remains to this day.


TIME magazine advertisement featuring MAC’s electromagnetic tester – June 1940

Throughout the 1930′s and 1940′s, the use of NDT expanded in the US steel industry, spurred by demands for ordnance testing in World War II. In a two page advertisement in TIME magazine in June, 1940, Jones and Laughlin Steel Corporation of Pittsburgh, PA, featured Magnetic Analysis Corp.’s electromagnetic tester, and described the merits of this test method for inspecting cold finished steel bars for cracks. MAC’s further development during this period led to the refinement of electromagnetic testing to also inspect for grade and hardness.


Eddy current tester, ERIC, inspecting stainless steel tubing

In 1953, MAC introduced the first commercial eddy current tester in the United States, a major advancement in NDT technology. This new eddy current technology measured the material’s conductivity instead of permeability, leading to a more reliable inspection for short surface defects, and allowing non-ferrous metals such as copper, brass, stainless steel and aluminum to be inspected.


Rotomac® rotary eddy current tester in 1990, first introduced in 1959 by MAC

In 1959, MAC launched an innovative solution to the problem of detecting long, continuous defects in wire and rod – the world’s first spinning probe eddy current tester. MAC’s expertise in rotary techniques has continued to expand, and today MAC’s high speed multiple test channel systems using eddy current, flux leakage and ultrasonic technologies are being used throughout the world.


During the 1960′s and 1970′s, under the direction of William Gould 3rd, who became President in 1964, MAC moved to a new plant in Mt. Vernon, N.Y. and successfully expanded overseas, introducing its test systems to Europe and Australia. The first equipment in Europe was installed at British Timken by MAC’s United Kingdom subsidiary in 1962. Other subsidiaries were established in Italy and Australia, and manufacturing operations were expanded with the opening of a plant in Ohio in 1975.

After more than 40 years in Mount Vernon, New York, Magnetic Analysis Corporation relocated to a larger plant at 103 Fairview Park Drive in Elmsford, New York. “The new facility will provide an 80% increase in space, greatly expanding our ability to manufacture and assemble large inspection systems and demonstrate them for customers,” notes company President Joseph Vitulli. “This move is critical to our strategy of offering the highest quality test equipment to meet the growing demands for inspecting tube, bar, wire and other metal components throughout the world”.


In a major advance, MAC developed the first eddy current tester featuring phase gating and filtering in 1968. These features allowed much greater selectivity in differentiating between test signals from defects and noise and signals from other sources. Further improvements added pulsed eddy current techniques which allowed greater power to be applied so larger size material could be inspected.


During the 1970′s, MAC developed flux leakage detectors for military ordnance parts applications and for tube and pipe inspection, including OCTG. Beginning in 1989, MAC introduced its own line of Echomac® ultrasonic rotary testers for tube and bar, followed by the addition of the Echomac FD instrumentation series, now the premier ultrasonic electronics.


Complex multi technology eddy current/ultrasonic inspection system, now in a tube mill in the Ukraine

In April, 1992, MAC introduced a fully computerized eddy current tester – a new benchmark for the industry. With its real-time full-color graphic display and sophisticated control of test parameters, MAC brought eddy current testing to a whole new level.

Building on the technological advances of the 20th century, MAC now operates on a world wide scale helping metal manufacturers throughout the globe meet more demanding specifications. A new plant in Scandinavia, run by MAC’s subsidiary M A Nordic, provides CE approved systems to customers throughout Europe, Russia and Eastern Europe. In recent years, Asia, South America, and India have also become key markets for the latest advances in nondestructive test instrumentation. Recent inspection systems include multiple technologies, materials handling, remote control and monitoring, all designed to meet the needs of each particular mill. Under the direction of MAC’s current President and CEO, Dudley Boden, MAC’s customer oriented design and support continues to provide customers with the flexibility they need to optimize their quality.