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Adopted by the Screw Thread Standardization Committees of Canada, the United Kingdom, and the United States on Nov 18, 1949 in Washington, D.C., the Unified Thread Standard or UTS are standards for screw threads used in the above countries with the hope they will be adopted universally. They may be found in the ASA (now ANSI) publication, Vol. 1, 1949.
Various countries have their own standards.
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