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.