# Thread Depth Tap Calc — Tap drill depth calculator

> Tap drill depth calculator (iPhone/iPad app by hao du.)

- Source: https://appshunter.io/ios/app/thread-depth-tap-calc/id6772780506 (this page in markdown: same URL + `.md`)
- Developer: [hao du](https://appshunter.io/developer/1454457703)
- Category: Utilities
- Price: $0.29 (on sale, was $0.39)
- Age rating: 4+
- Requires: iOS 15.6 · 12 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China)
- Released: 2026-05-26
- Data updated: 2026-07-27
- User reviews in markdown: https://appshunter.io/ios/app/thread-depth-tap-calc/id6772780506/reviews.md

## What is Thread Depth Tap Calc?

Thread Depth Tap Calculator is a paid standalone utility for quickly checking threaded hole parameters in workshops, repair work, hardware machining, and engineering prototypes.

The app uses metric thread size, target effective thread depth, plate thickness, blind-hole allowance, and drill point angle to calculate recommended tap drill diameter, minimum drilling depth, tapping depth, remaining safety margin, and breakthrough risk. You can also create frequently used size templates and save local project records for fast checks before repeat machining.

All calculations are performed locally on your device. No login is required, no internet connection is used, and no user data is collected.


## Version history (last 2 releases)

### 1.1 — 2026-07-24

Added a feedback feature.

### 1.0 — 2026-05-27

No release notes.

## More apps by hao du

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All apps by hao du: https://appshunter.io/developer/1454457703

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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 2026-07-27.*