Hole & Shaft Fit Calculator (ISO 286)

Inputs

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Nominal (basic) size of the fit — the common diameter of the hole and shaft. ISO 286 covers 0–500 mm.
mm
Hole-basis ISO 286 fit. The hole is always H (lower deviation 0); the shaft letter and grades set the clearance.

Results

Default result
Edit inputs
Maximum clearance
0.041mm

Loosest assembly: hole max − shaft min.

Also computed

Minimum clearancePass0.007mm

clearance fit

Tightest assembly: hole min − shaft max.

Hole max25.021mm

H7: EI 0 / ES +21 µm

Hole min25.000mm

Shaft max24.993mm

g6: es -7 / ei -20 µm

Shaft min24.980mm

Method notes 3 notes
  • H7/g6 (sliding): hole H7 +21 µm, shaft g6 -7/-20 µm. Clearance 0.007–0.041 mm.
  • Hole-basis system: the hole letter is H, so its lower deviation EI = 0 and the hole runs from the nominal size up. Deviations are from the ISO 286 standard tolerance unit i = 0.45·∛D + 0.001·D, scaled by the IT grade and rounded to the nearest micrometre.
  • Clearance/locational fits only (shaft h, g, f, e, d). For interference/press fits use the press-fit / interference calculator. Verify against the ISO 286 tables for critical work.

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