# ISO Tolerance — Limits and Fits to ISO 286 > Calculates ISO hole and shaft tolerances and limits for engineering applications. (iPhone/iPad app by superllanboy.) - Source: https://appshunter.io/ios/app/iso-tolerance/id493852664 (this page in markdown: same URL + `.md`) - Developer: [superllanboy](https://appshunter.io/developer/439292731) - Category: Productivity, Reference - Price: $0.99 - Rating: 5.00/5 from 1 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 2 MB - Languages: American English, Chinese (Simplified, China) - Released: 2012-01-14 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/iso-tolerance/id493852664/reviews.md ## What is ISO Tolerance? ISO Tolerance is an application that brings ISO Hole Basis Tolerance charts to your iPhone. Based on ISO 286,the application allows users to enter a nominal diameter for hole or shaft, select the tolerance grade using a simple selector, and reveal the upper and lower tolerances based on the selected grade. The application calculates tolerances for nominal diameters between 0 and 500 mm in metric mode. The application calculates tolerances for nominal diameters between 0 and 19.685 inches in imperial mode. Tolerance grades range from "A" to "ZC" for holes, and "a" to "zc" for shafts. Additional functionality of ISO 2768 tolerances. Users can now find tolerances for Linear dimensions, Chamfers and Radii, Angles, Straightness, Flatness, Perpendicularity, Symmetry, and run out as defined in ISO 2768 table 1 and table 2. The app contains a limits and fits calculator for easily seeing which combination of tolerances offer clearance, transition or interference fits. Ideal for CNC Machinists, Manual Machinists, Inspectors, Designers, Draughtsmen and Students wishing to dispense with tolerance charts and books, bringing the convenience of all the information direct to the iPhone. ## Key features - ISO Hole Basis Tolerance charts - Metric and imperial unit support - Tolerance grade selection (A-ZC, a-zc) - ISO 2768 tolerances (linear, angles, etc.) - Limits and fits calculator - Clearance, transition, and interference fit visualization ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/iso-tolerance/id493852664/reviews.md ### 5/5 — Engineer *2020-05-15, version 3.0* Been using this since it first released Great little app Love the new limits and fits So much more convenient than the individual screens Now only need to add GD&T and I’ll be thrilled Recommend ### 5/5 — Useful *2017-09-03, version 2.0* Great help for engineering tolerances Saves having to look up tolerances in a Zeus book Also has many many more tolerances than a Zeus book Really useful ### 2/5 — Wrong hole tolerances *2017-07-22* For a M3 M7 the ISO tolerance is +0.00-.012 not -.02-.012. This caused me problems **Developer response:** The app data is correct for dimensions up to and including 3mm an M7 tolerance is -2,-12 for dimensions over 3 mm up to and including 6mm the tolerance is 0, -12 Sorry you encountered problems, but they were not caused by incorrect data in this app ### 1/5 — Worthless, wasted a dollar *2016-10-27* Not worth the data download cost, definitely not worth a dollar ### 5/5 — Well worth it for any machinist *2012-07-04* Very straight forward, easy to use and accurate. Shows entered shaft or bore size with tolerance sizes. ## Frequently asked questions about ISO Tolerance ### What is ISO Tolerance? ISO Tolerance is a paid application designed to bring ISO Hole Basis Tolerance charts to your iPhone. It helps users calculate upper and lower tolerances for holes and shafts based on nominal diameter and selected tolerance grades. ### What is the price of ISO Tolerance? ISO Tolerance is a paid application, priced at $0.99. This one-time purchase grants you access to all its features. ### Does ISO Tolerance support both metric and imperial units? Yes, ISO Tolerance supports both metric and imperial units. It calculates tolerances for nominal diameters between 0 and 500 mm in metric mode, and 0 to 19.685 inches in imperial mode. ### What types of ISO 2768 tolerances can ISO Tolerance calculate? ISO Tolerance can calculate tolerances for Linear dimensions, Chamfers and Radii, Angles, Straightness, Flatness, Perpendicularity, Symmetry, and run out as defined in ISO 2768 table 1 and table 2. ### Is ISO Tolerance available on Android devices? Based on the provided data, ISO Tolerance is currently only supported on iPhone and iPod devices. There is no information indicating Android compatibility. ### How frequently is ISO Tolerance updated? The latest version of ISO Tolerance is 3.0, which was last updated on May 14, 2020. The update frequency can vary, but this indicates a recent update. ### Does ISO Tolerance have ads? No, ISO Tolerance does not contain advertisements. The application is ad-free, allowing for an uninterrupted user experience. ### What is the age rating for ISO Tolerance? ISO Tolerance has an age rating of 4+, making it suitable for a wide range of users, including younger individuals who may be learning about engineering concepts. ## Version history (last 5 releases) ### 3.0 — 2020-05-14 Updated the App for IOS13 Added an ISO fits function, which allows users to conveniently check for clearance, transition or interference fits. ### 2.1 — 2018-04-18 Updated Code for latest IOS Fixed issue with keyboard entry in countries with decimal symbol as comma ### 2.0 — 2017-08-31 Updated the code for the latest IOS Improved UI English and Chinese language support ### 1.2 — 2012-03-18 Added a Glossary of GD&T symbols and explanations as defined in ASME 14.5 and various ISO standards. The user is able to scroll through the commonly used symbols to find a definition of the symbol and an explanation of its application where appropriate. The information provided is meant to serve as a quick and simple ready reference, suitable as a reminder of the GD&T symbols. The ASME and ISO standards are very comprehensive and detailed, and the extent of the information they provide can not be fully represented here. ### 1.1 — 2012-02-12 Added additional functionality of ISO 2768 tolerances. Users can now find tolerances for Linear dimensions, Chamfers and Radii, Angles, Straightness, Flatness, Perpendicularity, Symmetry, and run out as defined in ISO 2768 table 1 and table 2. ## More apps by superllanboy - [Trig Calculator](https://appshunter.io/ios/app/trig-calculator/id496367309) - [Surface Finish](https://appshunter.io/ios/app/surface-finish/id498813301) - [Thread Data](https://appshunter.io/ios/app/thread-data/id550463158) All apps by superllanboy: https://appshunter.io/developer/439292731 --- *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.*