MetroX ISO Fit Calculator

MetroX is an ISO fit calculator built for engineers who need answers fast. This ISO fit calculator delivers ISO 286 limits & fits for holes and shafts in seconds—so you can make confident choices in design, machining, and inspection.

What you can do (ISO 286 limits & fits)
	•	Calculate hole and shaft limit sizes (min/max) from a nominal size and fit designation (e.g., H7/g6, H6/h5, F6/f6).
	•	See minimum and maximum clearance (or interference) instantly.
	•	Classify the fit type automatically: clearance, transition, or interference.
	•	Compare multiple fits quickly while iterating designs or checking drawings.

Typical use cases
	•	Mechanical design: validate tolerances before releasing drawings and avoid costly rework.
	•	Machining & tooling: quick shop-floor checks for hole limits, shaft limits, and expected clearance.
	•	Metrology & inspection: verify parts against ISO 286 limits during incoming/outgoing QC.
	•	Education & reference: learn how ISO fits behave across sizes and tolerance grades.

Why MetroX
	•	Fast: minimal inputs, instant results.
	•	Practical: focuses on the numbers you actually need (limits + clearance/interference).
	•	Reliable workflow: forward calculation + reverse fit selection.

FAQ

Does it support clearance and interference fits?
Yes—MetroX calculates min/max clearance or interference and classifies the fit type.

Can I start from a target clearance?
Yes—use the reverse workflow to pick a fit based on your target range.

Who is it for?
Mechanical engineers, machinists, toolmakers, inspectors, and students working with ISO 286.

Download MetroX and speed up your fit decisions today.