Every mechanical engineer or designer eventually runs into the same question that: how tight should this fit of a component should be? Flip through an ISO 286 table and you’ll find dozens of tolerance grades and fit classes, each with its own pair of deviations to look up, add, and subtract.

Choosing the right fit between a shaft and a hole is one of those details that quietly decides whether an assembly slides, presses or seizes. The Fits and Tolerance Calculator takes the guesswork out of it: enter a nominal size, select your hole and shaft tolerance grades and instantly see the upper and lower limits, the resulting clearance or interference and what kind of fit you’re actually dealing with. It’s built on the ISO 286 system, so the numbers line up with the standards your drawings already reference.

Here is the Fits and Tolerance Calculator collapses that whole process into a few inputs.

Mahesh Vyas

I am Engineer and Web Developer. I made enggkatta.com to find the better solutions for our engineering community, help and provide the information about engineering and technology. Follow me on Twitter and Instagram.