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Limits, Fits and tolerancesMetrology and Instrumentation Dr. Belal GharaibehJuly 28, 2011
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SYSTEM OF FITS AND TOLERANCESThe standard reference temperatureis 20 C for industrial measurementsand, consequently, for dimensions defined by the system.Due to the inevitable inaccuracy of manufacturing methods, a partcannot be made precisely to a given dimension, the difference between maximum and minimum limits of size is the tolerance.When two parts are to be assembled, the relation resulting from the difference between their sizes before assembly is called a fit.