ToleranceLab
ISO 286 fits and press-fits
About
This app assists engineers in selecting and understanding ISO 286 fits for mechanical designs. It calculates clearance or interference based on nominal size and basis classes, providing visual representations of resulting diameters. The tool also estimates contact pressure and stress for press fits and includes a reference guide for definitions and recommendations.
What's New in ToleranceLab
1.10
August 25, 2026
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.
MoreFAQ
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.
