# DatumLab — Thread, Tolerance & CNC Calc

> Thread, Tolerance & CNC Calc (iPhone/iPad app by 建东 刘.)

- Source: https://appshunter.io/ios/app/datumlab/id6780406607 (this page in markdown: same URL + `.md`)
- Developer: [建东 刘](https://appshunter.io/developer/1896489302)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China)
- Released: 2026-06-17
- Data updated: 2026-08-12
- User reviews in markdown: https://appshunter.io/ios/app/datumlab/id6780406607/reviews.md

## What is DatumLab?

DatumLab is a practical mechanical toolbox for machinists, CNC operators, mechanical designers, and shop-floor technicians.
Use it to look up common thread data, calculate ISO fits, estimate speed and feed values, convert shop units, check material references, and save frequently used setups. Core tools work offline, so you can keep working at the machine, in the workshop, or during design review without depending on a network connection.
Key tools:
Thread calculator for metric, UNC, UNF, BSP, NPT, trapezoidal, and Heli-Coil references
Tap drill, clearance hole, pitch, pitch diameter, and minor diameter lookup
ISO tolerance and fit calculator for common hole and shaft zones
Speed and feed calculations for milling, drilling, tapping, and turning
Radial chip thinning and thread turning helpers
Unit conversion for length, pressure, torque, speed, force, and mass
Material references for common aluminum, steel, stainless, non-ferrous, and plastic materials
Weight, bolt preload, and geometry helpers
Favorites, recent calculations, custom tools, custom materials, and exportable reports
DatumLab is designed for quick reference and setup planning. Values are reference starting points only. Always verify final machining parameters with your tool, machine, workholding, material, and supplier recommendations.


## Version history (last 1 release)

### 0.1.0 — 2026-06-17

No release notes.

## More apps by 建东 刘

- [Courierly](https://appshunter.io/ios/app/courierly/id6767714878)
- [SayDue](https://appshunter.io/ios/app/saydue/id6769789091)
- [CutMate CNC](https://appshunter.io/ios/app/cutmate-cnc/id6780144362)

All apps by 建东 刘: https://appshunter.io/developer/1896489302

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-12.*