⚙️ ISO 286-1 Tolerance & Fits Calculator

Calculate limit deviations, tolerance values, and fit types according to ISO 286-1

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Input Parameters

Convention: Hole basis system — H = fundamental deviation 0 (EI = 0). IT = tolerance grade width. Deviations per ISO 286-1:2010.

Results

Hole

—
ES = —   EI = —
IT = —

Shaft

—
es = —   ei = —
IT = —

Fit type

—

Limits of fit

Max clearance / Min interference: —
Min clearance / Max interference: —

Tolerance zone diagram

Common Fits Quick Reference

ISO 286-1 preferred fits for the entered nominal diameter. Hole basis (H) system.

Fit designation Type Max clearance
(μm)		 Min clearance
(μm)		 Description
Enter a nominal diameter and click Calculate.

How to use

1. Enter the nominal diameter in mm (0–500 mm range per ISO 286-1).
2. Select hole tolerance (e.g. H7) and shaft tolerance (e.g. f7, k6, p6).
3. Click Calculate to see limit deviations, fit type, and tolerance zone diagram.

Sign convention: Positive deviation = above nominal line. Negative = below.
Hole: ES = upper deviation, EI = lower deviation.
Shaft: es = upper deviation, ei = lower deviation.

IT grades available: IT01, IT0, IT1 … IT18.
Fundamental deviations for holes: A–ZC. For shafts: a–zc.