QualiySys QMSys Tolerances & Fits v5
Introduction
The software products QMSys Tolerances & Gauges, Tolerances & Fits can be used to choose a fit and
determine tolerances and deviations of machine parts according to the following international, European and
national standards:
• ISO 286, ANSI B4.2 for nominal dimensions up to 3150mm
• ISO 286, ANSI B4.2, GOST 25346 for nominal dimensions up to 3150mm
• DIN 7172 for nominal dimensions over 3150mm up to 10000mm
• GOST 25348 for nominal dimensions over 3150mm up to 10000mm
• ANSI B4.1 for nominal dimensions up to 200 inch
• ISO 2768-1 for nominal dimensions without individual tolerance indications up to 3150mm
Data base and techniques for calculating the nominal sizes and limit values of the following gauges have been
Software description
The menu and functional buttons are located in the title bar of the program. Standard and tolerances for the hole
and/or for the shaft are entered in field “Product”. Standard for the plane gauges is selected in the field “Gauges”.
Tolerances are entered in the following ways:
• selection of a standard tolerance – a combination of basic deviation and tolerance grade
• entering of non-standard tolerances by the limit sizes of the hole and shaft
• entering of non-standard tolerances by the limit deviations of the hole and shaft.
The following data is situated on separate pages:
• nominal and limit sizes of the workpiece, tolerance designation, fit parameters
• nominal and limit sizes of gauges for checking holes
• nominal and limit sizes of gauges for checking shafts
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