# ISO PREFERRED FITS CALCULATOR

ISO preferred fits calculator to calculate preferred tolerances of shafts and holes according to metric ISO 286-1 (2010) and ANSI B4.2 (1978) standards. Size limits and deviations are calculated and fit type (clearance, transition and interference) is found by the calculator.

### ISO Preferred Fits and Tolerance Calculator:

 INPUT PARAMETERS Parameter Value Unit Nominal Size mm Hole Tolerance B11 C10 C11 D9 D10 E8 E9 F7 F8 F9 G6 G7 H6 H7 H8 H9 H10 JS6 JS7 K6 K7 M6 M7 N6 N7 P6 P7 R7 S7 T7 U7 X7 --- Shaft Tolerance b9 b11 c9 c11 d8 d9 d10 e7 e8 e9 f6 f7 f8 g5 g6 h5 h6 h7 h8 h9 h10 js5 js6 js7 k5 k6 k7 m5 m6 m7 n5 n6 p5 p6 r6 s6 s7 t6 u6 u7 x6 ---

Note : Use dot "." as decimal separator.

 RESULTS HOLE Parameter Value Unit Designation --- --- Hole Upper Deviation --- μm (0.001mm) Hole Lower Deviation --- μm (0.001mm) Maximum Hole Size --- mm Minimum Hole Size --- mm SHAFT Parameter Value Unit Designation --- --- Shaft Upper Deviation --- μm (0.001mm) Shaft Lower Deviation --- μm (0.001mm) Maximum Shaft Size --- mm Minimum Shaft Size --- mm FIT Parameter Value Unit Designation --- --- Fit Type --- --- Maximum Clearance --- μm (0.001mm) Minimum Clearance --- μm (0.001mm)

### Reference:

• ISO 286-1 (2010) Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits
• ISO 286-2 (2010) Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts
• ANSI/ASME B4.2 (1978) Preferred Metric Limits and Fits