I Open-Sourced the ISO 286 Fit Tables Behind My Tolerance Tool

说明与用途

该仓库提供 ISO 286-2 常用组合的计算表，方便自动化容差分析。

问题

PDF tables for ISO 286-2 were inconvenient to use in code.

结果

The repository provides a lightweight, code-friendly source of ISO 286-2 fit tables for common design subsets, reducing reliance on PDF tables and enabling automated tolerance analysis.

工作流

• 1. Clone the repo from https://github.com/chenzefeng09/iso-286-fits.
• 2. Run the Python script: python iso286.py 25 H7/p6 to get fit limits for a 25 mm hole with H7/p6 fit.
• 3. Use the TypeScript module or import fits.json for integration into other projects.
• 4. For non-code use, visit https://nxtolerance.com/standards to view the calculator in a browser.

证据

Tired of PDF tables, I keep a computed subset of ISO 286-2 in code — limits & fits for the hole-basis combinations that actually show up on drawings: IT5–IT8, shafts f/g/h/k/p, all 13 size bands to 500 mm.

来源

Now it's a standalone MIT repo. Three ways to use it: python iso286.py 25 H7/p6 ...

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Honest scope note: this is the common-design subset — shafts outside f/g/h/k/p, grades outside IT5–IT8, and shaft-basis fits aren't in it.

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