# Thread Chart

> Machinist tool for screw thread tolerances and tap hole calculations. (iPhone/iPad app by Igor Pivnyk.)

- Source: https://appshunter.io/ios/app/thread-chart/id1335115083 (this page in markdown: same URL + `.md`)
- Developer: [Igor Pivnyk](https://appshunter.io/developer/1335115082)
- Category: Reference
- Price: Free
- Rating: 3.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 8.0 · 16 MB
- Languages: English
- Released: 2018-01-15
- Data updated: 2026-06-28
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/thread-chart/id1335115083/reviews.md

## What is Thread Chart?

App for machinists who need screw thread tolerances. Any ISO or UN thread can processed. Even such exotics as M12.3x1.34. Internal and external threads supported. Also calculation of tap holes provided. You do not need tolerance tables and wasting time for searching anymore. All you need is in your phone

Note: Due to rounding rules there may be some miscalculations (one or two microns). If precision is critical you should use appropriate standard.

## Key features

- ISO and UN thread tolerance processing
- Support for exotic thread sizes
- Internal and external thread calculations
- Tap hole calculation
- Eliminates need for tolerance tables


## Frequently asked questions about Thread Chart

### What are the primary functions of Thread Chart?

Thread Chart processes ISO and UN screw thread tolerances, including exotic sizes, for both internal and external threads. It also calculates tap holes, removing the need for physical tolerance tables.

### What types of threads does Thread Chart support?

Thread Chart supports any ISO or UN thread, including specialized sizes like M12.3x1.34. It handles both internal and external thread calculations.

### How accurate is Thread Chart?

Due to rounding rules, there may be minor miscalculations of one or two microns. For critical precision, it is recommended to use appropriate industry standards.

### Is Thread Chart available on multiple devices?

The provided data does not specify platform compatibility. However, it is listed as a mobile application, suggesting availability on smartphones and tablets.

### When was Thread Chart last updated?

Thread Chart was last updated on May 27, 2018, with version 1.1. The app was initially released on January 15, 2018.

### What is the user rating for Thread Chart?

Thread Chart has a rating of 3.0 stars based on 2 user ratings. This indicates a mixed reception from its user base.

### What is the age rating for Thread Chart?

Thread Chart has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in technical applications.

### Does Thread Chart have ads?

The provided data does not specify if Thread Chart contains advertisements. The 'hasAds' field is null.

## Version history (last 1 release)

### 1.1 — 2018-05-27

- Complete redesign
- Added BSPP Thread Support
- Added switch between millimeters and inches
- Changed input methods for UN Threads

## More apps by Igor Pivnyk

- [Work Time Monitor](https://appshunter.io/ios/app/work-time-monitor/id1460581553)

All apps by Igor Pivnyk: https://appshunter.io/developer/1335115082

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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 2026-06-28.*