# ToleranceLab — ISO 286 fits and press-fits

> ISO 286 interference fit calculator for engineers with stress estimation. (iPhone/iPad app by Orlando Cossia Castiglioni.)

- Source: https://appshunter.io/ios/app/tolerancelab/id6757369411 (this page in markdown: same URL + `.md`)
- Developer: [Orlando Cossia Castiglioni](https://appshunter.io/developer/1866416694)
- Category: Utilities, Reference
- Price: $2.99
- Rating: 5.00/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 18.6 · 1 MB
- Languages: French (France), German (Germany), American English, Chinese (Simplified, China), Italian, Japanese
- Released: 2026-01-06
- Data updated: 2026-09-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/tolerancelab/id6757369411/reviews.md

## What is ToleranceLab?

ToleranceLab helps engineers pick ISO 286 fits and understand what those selections mean in the real world. Enter a nominal size, choose hole- or shaft-basis classes, and get clearance/interference results with a simple visual that labels the resulting diameters.

Use the guided fit intent picker to match common engineering goals (free running, locational, transition, or interference) and jump into the built-in reference guide for definitions and ISO fit recommendations. When a press fit is detected, ToleranceLab estimates contact pressure and axial force using selectable compliance models and material data, with warnings and assumptions shown alongside results.

Switch between metric and imperial units, explore fit classes quickly, and keep a practical reference at hand for design and manufacturing decisions.

Disclaimer: ToleranceLab is provided as a general engineering reference tool only. All results and calculations are estimates based on standard formulas, assumptions, and user-supplied inputs. The app does not provide professional engineering, design, or safety advice and is not a substitute for independent analysis, validation, or review by a qualified engineer. To the maximum extent permitted by law, the developer assumes no liability for errors, omissions, or outcomes resulting from the use of this app. Users are solely responsible for verifying results and ensuring suitability for their specific application and compliance with applicable standards and regulations.

## Key features

- ISO 286 fit selection
- Hole/shaft basis class calculation
- Clearance/interference visualization
- Guided fit intent picker
- Press fit stress estimation
- Metric/imperial unit switching


## Frequently asked questions about ToleranceLab

### What is ToleranceLab used for?

ToleranceLab helps engineers select and understand ISO 286 fits, calculating clearance or interference and visualizing the resulting diameters. It also estimates stress for press fits and provides a reference guide.

### What are the pricing details for ToleranceLab?

ToleranceLab is a paid application, priced at $2.99. There are no in-app purchases or subscriptions mentioned.

### Does ToleranceLab have ads?

No, ToleranceLab does not contain advertisements. It is a paid application and is ad-free.

### What devices does ToleranceLab support?

ToleranceLab is currently supported on iPhones. Information regarding Android or other device compatibility is not provided.

### How often is ToleranceLab updated?

ToleranceLab was last updated on January 7, 2026, with version 1.0. Further update frequency information is not available.

### What is the age rating for ToleranceLab?

ToleranceLab has an age rating of 4+, making it suitable for a wide range of users.

### Can ToleranceLab be used offline?

The description does not specify if ToleranceLab requires an internet connection to function. However, its nature as a calculation tool suggests it may operate offline.

### What kind of engineering goals can ToleranceLab help with?

ToleranceLab features a guided fit intent picker that helps match common engineering goals such as free running, locational, transition, or interference fits.

## Version history (last 2 releases)

### 1.10 — 2026-08-25

This release corrects the ISO 286 calculations. Results now match the published standard, so values differ from previous versions for most fit classes — interference fits especially.

• Rebuilt the ISO 286 tolerance tables. Hole and shaft deviations, tolerance grades, and the finer nominal size ranges now follow ISO 286-1 and ISO 286-2 exactly. 
• Fixed inch mode, which showed millimetre values labelled as inches. Diameters entered in inches are converted properly, and results are shown to a useful precision. 
• Fixed press-fit contact pressure and assembly force, which read about 10% high, and the warnings now use the materials and friction you enter. 
• Corrected the shaft-basis interference recommendations, which suggested clearance fits. 
• English now appears as a supported language. 
• Added titles to the Reference and Settings tabs, localized the theme setting, and improved VoiceOver support. 
• Diameters outside the supported range, and tolerance classes ISO does not define at a given size, are now explained instead of showing a blank result.

### 1.0 — 2026-01-07

No release notes.

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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 2026-09-08.*