📏 GD&T & Fits  ·  ISO 286 / ANSI B4.1

Tolerance Reference Tool

ISO 286 hole/shaft tolerance calculator — get min/max limits, clearance/interference, and fit type

1
Fit Parameters
Fit Analysis Result
Clearance Fit
LIVE
🔴 HOLE (H7)
0.000 mm0.000 mm
Min → Max
⚫ SHAFT (g6)
0.000 mm0.000 mm
🔹 Min Clearance/Interference:—
🔹 Max Clearance/Interference:—
🔹 Tolerance Band:—
ISO 286 Standard: H7/g6 = Sliding fit • H7/f7 = Running fit • H7/k6 = Transition fit • H7/p6 = Interference fit
ANSI B4.1: RC (Running), LC (Locational Clearance), LT (Transition), LN (Locational Interference), FN (Force)

Quick reference for ISO 286 hole-basis fits. Select nominal size and tolerance classes to get exact limits. Common fits: H7/g6 (sliding), H7/f7 (running), H7/k6 (transition), H7/p6 (press).

— Vaibhav Dhokpande, Developer · TaskJunction

📖 ISO 286 Tolerances — Reading the System

ISO 286 defines the system of limits and fits for cylindrical features (shafts and holes). A tolerance designation like H7/g6 means: H7 hole (capital letter = hole), g6 shaft (lowercase = shaft). The letter defines the position of the tolerance zone relative to zero line; the number defines the tolerance grade (IT grade).

Higher IT grades mean tighter tolerances — IT5 and IT6 are precision fits (require grinding), IT7 and IT8 are normal engineering fits (fine turning or boring), IT9–IT11 are for general machining.

The three main fit types are: clearance fit (shaft always smaller than hole — for sliding, running), interference fit (shaft always larger — for press fits, shrink fits), and transition fit (may be clearance or interference depending on which end of tolerance each part falls).

Common Fit Applications

FitTypeTypical Use
H7/g6ClearanceSliding fit, easy assembly
H7/k6TransitionLocation fit, light press
H7/p6InterferencePress fit, gear hubs
H7/f7ClearanceRunning fit, bearings
H6/js5TransitionPrecision location