International Source Index, Inc.

“Your Bearing Experts”

International Source Index, Inc. was founded in 1991. Our mission is to provide the most comprehensive independent bearing database for use in plant and storeroom management, condition monitoring, and reliability engineering for industrial products.

ISI has over 70 years’ experience in the world of industrial distribution. We are committed to offering a web-based tool and customized bearing libraries used to compliment plant condition monitoring programs and integrate into SaaS products. The Bearing Expert’s™ depth of data directly adds value while increasing time and dollar savings for our customers and partners.

We are proud to offer distribution of The Bearing Expert™ in over 95 countries representing every industry.

Thank you for visiting our Web site and supporting our products.

Bearing Expert™ Worldwide Distribution



Robert A. Kieffer              Founder, Chairman of the Board

Our resident “Bearing Expert”, Robert Kieffer has over 60 years in the industrial supply and service industry. He provides a depth of knowledge to our company that cannot be duplicated. Robert began his career owning one of the largest independent bearing distributorships in the Northeast and Canada. He was a pioneer in developing supply chain systems, bearing databases and online ordering using technology that predated the internet. He was invited to speak at the IBM Distribution Conferences, and he holds many patents on bearing sealing elements to his name.

Robert founded International Source Index, Inc. in 1991 and successfully brought the power of bearing data to the desktop by developing a client-based tool to be used in plant storerooms. The Bearing Expert™  bearing library is the only independent bearing interchange and ball and roller bearing vibration fault frequency database available worldwide.

With the long-standing relationships with major bearing manufacturers expansion into bearing frequency data was a natural fit for The Bearing Expert™. Our customers asked for this data and ISI delivered long before these data points were available on the web.

ISI takes pride in the fact that 30 years later The Bearing Expert™ still remains the only bearing database for users to access vibration data for over 100 major manufacturers in a single location.

Industries Served




Steel / Metal Processing

Government/ Defense


Paper Manufacturing

Bearing Distribution

Electric Motor Shops




Electric Power


Heavy Machinery

Chemical Processing


Building Materials

Bearing Manufacturing

Household Product Manufacturing

Food Production

Condition Monitoring and Reliability Solution Providers