Other Names For U.S. Customary Units
The United States Code refers to these units as "traditional systems of weights and measures".
Other common ways of referring to these systems in the United States are: "Standard," "Customary," or, somewhat erroneously when considering volume/tonnage, "Imperial," or "English," which refers to the pre-1824 reform measures used throughout the British Empire.
Tools and fasteners with sizes measured in inches are sometimes called "SAE bolts" or "SAE wrenches" to differentiate them from their metric counterparts. The Society of Automotive Engineers originally developed fasteners standards using U.S. units for the US auto industry; the organization now uses metric units.
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