Engineering tool · common ISO 286 fits
H / hShaft and Hole Fit Calculator
Estimate limit dimensions and the clearance or interference range for common hole-basis shaft fits.
Tolerance limits
Check a common hole-basis fit
Supported nominal sizes are over 1 mm through 500 mm. Results are rounded to whole micrometres and are intended for initial fit checks.
RESULT / 02
Fit limits
ISO 286-based calculation · rounded to 1 µm
Fit classification—hole / shaft
Hole limits—minimum … maximum
Shaft limits—minimum … maximum
Tightest condition—negative means interference
Loosest condition—positive means clearance
Clearance = hole diameter − shaft diameter
Calculation method
Read both ends of the tolerance range
A fit is defined by its worst-case minimum and maximum clearance, not only by nominal diameter.
01 / CLEARANCEHole min − shaft max
A positive minimum value means clearance exists in every tolerance combination.
02 / INTERFERENCEHole max − shaft min
A negative maximum value means interference exists in every tolerance combination.
03 / LIMITVerify the current standard
This tool covers common zones for initial checks; production drawings must use controlled ISO 286 tables.