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ISO Preferred Fits Calculator (ISO 286)

This online ISO preferred fits calculator helps you calculate size limits, deviations and fit type (clearance, transition or interference) for metric shafts and holes. Calculations are based on ISO 286-1:2010, ISO 286-2:2010 and ANSI/ASME B4.2:1978 preferred metric limits and fits.

Enter the nominal size and select the hole tolerance and shaft tolerance. The calculator returns:

• Upper and lower deviations for hole and shaft
• Maximum and minimum hole and shaft sizes
• Resulting fit designation (for example H7/g6)
• Fit type: clearance fit, transition fit or interference fit
• Maximum and minimum clearance or interference

How to use the ISO preferred fits calculator

Input parameters for ISO 286 preferred fits calculation

INPUT PARAMETERS
Parameter	Value	Unit
Nominal size (basic size)		mm
Hole tolerance (ISO position / IT grade)	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 (ISO position / IT grade)	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 a dot . as decimal separator for the nominal size.

Calculating fit, please wait...

Calculated tolerance results

RESULTS
HOLE (ISO tolerance of hole)
Parameter	Value	Unit
Hole designation	---	---
Hole upper deviation (ES)	---	μm (0.001 mm)
Hole lower deviation (EI)	---	μm (0.001 mm)
Maximum hole size	---	mm
Minimum hole size	---	mm
SHAFT (ISO tolerance of shaft)
Parameter	Value	Unit
Shaft designation	---	---
Shaft upper deviation (es)	---	μm (0.001 mm)
Shaft lower deviation (ei)	---	μm (0.001 mm)
Maximum shaft size	---	mm
Minimum shaft size	---	mm
RESULTING FIT (hole/shaft)
Parameter	Value	Unit
Fit designation (hole / shaft)	---	---
Fit type	---	---
Maximum Clearance	---	μm (0.001 mm)
Minimum Clearance	---	μm (0.001 mm)

Related ISO limits and fits resources

Use the following pages together with this calculator to select suitable fits and tolerances:

• Limits, fits and tolerances – ISO and ANSI systems (overview)
• Preferred fits and tolerances charts (ISO 286)

Standards used in this ISO preferred fits calculator

The calculations on this page are based on the following standards:

• 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