# ISO Fits

> ISO fits and tolerances calculator for shafts and bores. (iPhone/iPad app by Trelleborg Sealing Solutions.)

- Source: https://appshunter.io/ios/app/iso-fits/id396863755 (this page in markdown: same URL + `.md`)
- Developer: [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758)
- Category: Productivity, Reference
- Price: Free with in-app purchases
- Rating: 4.20/5 from 6 App Store ratings · 31 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 66 MB
- Languages: American English, Dutch, German (Germany), Japanese, Chinese (Simplified, China), European Spanish
- Released: 2010-10-14
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/iso-fits/id396863755/reviews.md

## What is ISO Fits?

It includes the following features:

- Fits calculation: Upon entering the nominal diameter (of either bore or shaft), users select their tolerance classes for bore and shaft. The app then provides the complete ISO fits definition with all relevant values.
- Tolerances: Shows the tolerances for the most commonly used ISO tolerance classes.
- switch between metric and inch version.
- Charts: Shows the most common ISO tolerances classes in a diagram.
- Videos: Features the automatically updated latest TSS youtube videos.

The results of this application are based on DIN ISO 286

Nominal dimension:
1-3150mm

following tolerances included:
Shaft: a9, a10, a11, a12, a13, b8, b9, b10, b11, b12, b13, c8, c9, c10, c11, c12, cd5, cd6, cd7, cd8, cd9, cd10, d5, d6, d7, d8, d9, d10, d11, d12, d13, e5, e6, e7, e8, e9, e10, ef3, ef4, ef5, ef6, ef7, ef8, ef9, ef10, f3, f4, f5, f6, f7, f8, f9, f10, fg3, fg4, fg5, fg6, fg7, fg8, fg9, fg10, g3, g4, g5, g6, g7, g8, g9, g10, h1, h2, h3, h4, h5, h6, h7, h8, h9, h10, h11, h12, h13, h14, h15, h16, h17, h18, js1, js2, js3, js4, js5, js6, js7, js8, js9, js10, js11, js12, js13, js14, js15, js16, js17, js18, j5, j6, j7, j8, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, m3, m4, m5, m6, m7, m8, m9, n3, n4, n5, n6, n7, n8, n9, p3, p4, p5, p6, p7, p8, p9, p10, r3, r4, r5, r6, r7, r8, r9, r10, s3, s4, s5, s6, s7, s8, s9, s10, t5, t6, t7, t8, u5, u6, u7, u8, u9, v5, v6, v7, v8, x5, x6, x7, x8, x9, x10, y6, y7, y8, y9, y10, z6, z7, z8, z9, z10, z11, za6, za7, za8, za9, za10, za11, zb7, zb8, zb9, zb10, zb11, zc7, zc8, zc9, zc10, zc11

Bore: A9, A10, A11, A12, A13, B8, B9, B10, B11, B12, B13, C8, C9, C10, C11, C12, C13, CD6, CD7, CD8, CD9, CD10, D6, D7, D8, D9, D10, D11, D12, D13, E5, E6, E7, E8, E9, E10, EF3, EF4, EF5, EF6, EF7, EF8, EF9, EF10, F3, F4, F5, F6, F7, F8, F9, F10, FG3, FG4, FG5, FG6, FG7, FG8, FG9, FG10, G3, G4, G5, G6, G7, G8, G9, G10, H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16, H17, H18, JS1, JS2, JS3, JS4, JS5, JS6, JS7, JS8, JS9, JS10, JS11, JS12, JS13, JS14, JS15, JS16, JS17, JS18, J6, J7, J8, J9, K3, K4, K5, K6, K7, K8, K9, K10, M3, M4, M5, M6, M7, M8, M9, M10, N3, N4, N5, N6, N7, N8, N9, N10, N11, P3, P4, P5, P6, P7, P8, P9, P10, R3, R4, R5, R6, R7, R8, R9, R10, S3, S4, S5, S6, S7, S8, S9, S10, T5, T6, T7, T8, U5, U6, U7, U8, U9, U10, V5, V6, V7, V8, X5, X6, X7, X8, X9, X10, Y6, Y7, Y8, Y9, Y10, Z6, Z7, Z8, Z9, Z10, Z11, ZA6, ZA7, ZA8, ZA9, ZA10, ZA11, ZB7, ZB8, ZB9, ZB10, ZB11, ZC7, ZC8, ZC9, ZC10, ZC11

## Key features

- ISO fits calculation
- Tolerance class display
- Metric/inch unit switching
- Tolerance charts
- Updated YouTube videos

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Version with complete ISO286 Standard | $1.99 | one-time |


## Recent user reviews (10 of 31)

All indexed reviews: https://appshunter.io/ios/app/iso-fits/id396863755/reviews.md

### 5/5 — Incroyable

*2026-05-11, version 4.3*

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

### 5/5 — Trop cool

*2026-05-11, version 4.3*

J’adore trellborg et ido fit

### 5/5 — Mechanical engineering

*2025-02-04, version 4.2*

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 🫨🫨🫨

### 1/5 — Can’t enter decimal points

*2023-05-03, version 3.9*

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.

### 1/5 — Completely Impractical

*2016-04-20, version 3.0*

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!

### 5/5 — Fit for the job

*2016-03-23, version 2.9*

Comes in very handy ,easy to use

### 5/5 — Works verywell for ISO fits

*2016-01-11, version 2.9*

The app works great. Would be helpful if a metric shaft could be entered and imperial fits returned.

### 5/5 — Good

*2014-09-25*

Very good

### 5/5 — Mech. Engineer

*2014-08-14, version 2.2*

Accurate and easy to use, a great tool to have. I am using the application frequently and I am very pleased with its capabilities.

### 5/5 — Handy App

*2014-07-01, version 2.1*

Very useful when computing tolerances for various fits between shafts and holes!

## Frequently asked questions about ISO Fits

### 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.

## Version history (last 5 releases)

### 4.3 — 2025-05-20

Minor Enhancement

### 4.2 — 2024-06-24

Privacy Policy Update.

### 4.1 — 2023-10-17

Minor Bug Fixes.

### 4.0 — 2023-06-27

Minor Bug Fixes.

### 3.9 — 2023-04-18

Third Party Licenses Included.

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## More apps by Trelleborg Sealing Solutions

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All apps by Trelleborg Sealing Solutions: https://appshunter.io/developer/396863758

## Related topics

[sealing solutions reference](https://appshunter.io/ios/topics/sealing-solutions-reference)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*