Why I Built This Locating Pin Size Calculator
Every time I was designing a jig or fixture I kept going back to tolerance tables to figure out pin and hole sizes. You know the fit you want, clearance or interference, but translating that into actual upper and lower deviations while keeping track of what the max and min clearance actually comes out to is the part that takes time.
The press fit force calculation is the one that really catches people. A small interference on a 10mm pin over 20mm length with the right friction coefficient gives you a completely different assembly force than you'd guess by feel. And if you get it wrong you are either hammering the pin in and cracking the housing or the pin falls out under load.
This tool covers all three fit categories with ISO 286 quick presets so you can pick a standard fit designation and have the deviations filled in automatically, then check the exact clearance or interference range, and for press fits get the assembly and extraction forces before you cut any metal.
Part of TaskJunction — free mechanical engineering calculators. No login, no signup, just tools that work.
— Vaibhav Dhokpande, Developer · TaskJunction