# What is SuperNX? Siemens NX tolerance analysis, reports & PMI

SuperNX analyzes NX .prt models, classifies functional interfaces and checks key characteristics, with traceable reports and quality-gated PMI output.

Canonical: https://nxtolerance.com/about
Language: en-US

## What SuperNX does

SuperNX is a tolerance-chain analysis service for mechanical engineers working with Siemens NX .prt models. It extracts model geometry and PMI, identifies parts and functional interfaces, assigns tolerances, and checks key characteristics against their requirements. The public Standards tool provides a free fit and general-tolerance reference.

## From model to engineering evidence

The analysis workflow measures geometry, classifies connections, assigns tolerances, verifies key characteristics, prepares a report, generates a Word report, and checks the output. Interface interpretation matters: a rotating pin joint and a pin sliding in a slot can require different error models. Reported assumptions should be reviewed alongside the measured geometry.

## Reports and PMI output

Deliverables can include a Word report, key-characteristic verdict cards, part views and structured analysis data. When every key characteristic passes, the workflow can create a separate part copy with semantic PMI dimensions and geometric controls. A failing characteristic gates write-back. The source part is not overwritten.

## Using the service

Standards and learning articles are public. To analyze your own part, sign in to the workspace and use an eligible plan or trial with credits. Fast and Deep are analysis levels. Report language and tolerance-standard preferences are selected in Settings. Current plan and credit terms are shown on the product home and in the workspace.

## Scope and engineering review

A tolerance result depends on the identified mechanism, datum choices, specified limits, fits and process assumptions. Generated reports support engineering review; they are not a measurement of actual production capability or a certification that a manufactured assembly will work. Review any low-confidence interpretation and confirm manufacturing assumptions before releasing a design.

## Engineering guides

- [ISO 286 fit selection](https://nxtolerance.com/learn/iso-286-fit-selection/)
- [Worst-case vs statistical tolerance](https://nxtolerance.com/learn/worst-case-vs-statistical-tolerance/)
- [Tolerance analysis in Siemens NX](https://nxtolerance.com/learn/tolerance-analysis-in-nx/)
- [How SuperNX analyzes NX parts](https://nxtolerance.com/about)

## Primary standards references

- [ISO 286-1:2010 — tolerances, deviations and fits](https://www.iso.org/standard/45975.html)
- [ISO 286-2:2010 — tolerance classes and limit deviations](https://www.iso.org/standard/54915.html)
- [ISO 2768-1:1989 — dimensions without individual tolerance indications](https://www.iso.org/standard/7748.html)