fits_tolerances - Limits Fits and tolerances Metrology and...

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Limits, Fits and tolerances Metrology and Instrumentation Dr. Belal Gharaibeh July 28, 2011
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SYSTEM OF FITS AND TOLERANCES The standard reference temperature is 20 C for industrial measurements and, consequently, for dimensions defined by the system. Due to the inevitable inaccuracy of manufacturing methods, a part cannot 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.
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CLEARANCE FIT Maximum shaft dimension < Minimum hole dimension FIT - condition of looseness or tightness between two mating parts being assembled together
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