# SuperNX

> SuperNX is a tolerance-chain analysis service for engineers using Siemens NX .prt models. It offers a public ISO fit calculator and tolerance reference, plus a signed-in workspace for model analysis, reports and quality-gated PMI copies.

Public references require no account or subscription. Uploaded-part analysis requires an eligible plan or trial and credits. Results depend on geometry, interface interpretation and explicitly stated engineering assumptions. A failing key characteristic gates PMI write-back. Standards content is a selected reference, not the complete ISO standard.

## Product

- [What SuperNX does](https://nxtolerance.com/about/index.md): Workflow, deliverables, access and engineering-review limits.
- [SuperNX home](https://nxtolerance.com/index.md): Product overview.
- [Standards reference](https://nxtolerance.com/standards/index.md): ISO 286 fits, ISO 2768-1 linear tolerances and practical FAQs; public and free.

## Languages

- [Standards (zh-CN)](https://nxtolerance.com/zh/standards/index.md): Localized reference and FAQs.
- [Standards (ja-JP)](https://nxtolerance.com/ja/standards/index.md): Localized reference and FAQs.
- [Standards (de-DE)](https://nxtolerance.com/de/standards/index.md): Localized reference and FAQs.
- [Standards (fr-FR)](https://nxtolerance.com/fr/standards/index.md): Localized reference and FAQs.
- [Standards (es-ES)](https://nxtolerance.com/es/standards/index.md): Localized reference and FAQs.

## Engineering guides

- [ISO 286 fit selection](https://nxtolerance.com/learn/iso-286-fit-selection/): Public engineering guide.
- [Worst-case vs statistical tolerance](https://nxtolerance.com/learn/worst-case-vs-statistical-tolerance/): Public engineering guide.
- [Tolerance analysis in Siemens NX](https://nxtolerance.com/learn/tolerance-analysis-in-nx/): Public engineering guide.

## Optional

- [Expanded public reference](https://nxtolerance.com/llms-full.txt): English and Chinese product and standards content in one file.
- [Sitemap](https://nxtolerance.com/sitemap.xml): Indexable public pages, including existing engineering guides.
- [Privacy](https://nxtolerance.com/privacy/): Published privacy policy.
- [Security](https://nxtolerance.com/security/): Published security information.
- [Terms](https://nxtolerance.com/terms/): Published terms.