What Does SAE Mean on Auto Tools?

by Michael G. Sanchez

SAE stands for "Society of Automotive Engineers." Established in 1905 at the dawn of the automotive industry, the SAE is still active today and boasts well over 100,000 members. One of its accomplishments was the establishment of standards of measure for a wide range of tools and materials having to do with the American auto industry. Today, only a few countries still make use of the SAE measurement system for tools. The metric system has been adopted everywhere else.

The SAE System

SAE tools and fasteners are designated by fractions of an inch, such as a 1/2-, 5/8- or 15/16-inch wrench or nut. In comparison, metric tools and fasteners are measured in millimeters, such as an 18 mm or 20 mm socket or bolt.

About the Author

Michael G. Sanchez has been a professional writer for over 10 years. A lifelong car enthusiast and former senior mechanic, he has written on a wide range of automotive topics. He holds a bachelor's degree in English literature from Castleton State College. Sanchez started writing about cars as a part-time copywriter for a local dealership while still in high school.

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