Free
In-App Purchases

Details

  • Released
  • Updated
  • October 14, 2010
  • May 20, 2025

Features

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About

Calculate ISO fits and tolerances for shafts and bores. Supports metric and inch units, displays detailed fit definitions, and includes visual charts and educational videos.

ISO fits calculation
Tolerance class display
Metric/inch unit switching
Tolerance charts
Updated YouTube videos
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What's New in ISO Fits

4.3

May 20, 2025

Minor Enhancement

1

In-App Purchases

$1.99

Full Version with complete ISO286 Standard

Full version with complete ISO286 standard

User reviews

Incroyable

Application incroyable et très utile. J’adore Trelleborg et j’adore iso fits, félicitations.

Trop cool

J’adore trellborg et ido fit

Mechanical engineering

This was a fantastic app, but I wish it had the surface roughness. Quite disappointed it didn’t, and it should also help with any future engineers.

Much love. It should also a thermodynamics CFD software and Anysys Gradupack 🫨🫨🫨

Can’t enter decimal points

When you try to enter data, it pulls up the phone keypad—so you cannot enter decimal points. Interestingly there is a paste option to copy numbers from elsewhere—not working. There is a photo option to read in numbers through your camera—it reads the number, but when you tap ‘insert’, is does not insert. App currently only good for integers…. I love the info that Trelleborg puts out, but they need to fix this glitch.
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Completely Impractical

Whilst it lists every imaginable tolerance, there is no way of selecting suitable pairs of tolerances. If hoy want a light interference fit - hole basis, get your Zeus out!

Developer apps

FAQ

What does the ISO Fits app do?

This app calculates ISO fits and provides detailed definitions for shafts and bores. Users can input nominal diameters and select tolerance classes to see all relevant fit values. It also displays common ISO tolerance classes in diagrams and includes updated educational videos.

What are the key features of the ISO Fits app?

Key features include an ISO fits calculation engine, a comprehensive display of tolerances for commonly used ISO classes, the ability to switch between metric and inch units, visual charts of tolerance classes, and access to the latest TSS YouTube videos.

Is the ISO Fits app free to use?

The app is free to download and use, but it offers in-app purchases. This means some features or content might require a purchase to unlock.

What nominal dimensions and tolerances are supported?

The app supports nominal dimensions from 1mm to 3150mm. It includes a vast array of shaft and bore tolerances, such as a9, H7, D10, and many others, following the DIN ISO 286 standard.

Who would benefit from using this app?

This app is ideal for mechanical engineers, designers, machinists, and students who work with precision engineering. It's useful for anyone needing to quickly and accurately determine shaft and bore fits according to ISO standards.