# Tap Drill Pocket — Thread Chart for Machinists

> Thread Chart for Machinists (iPhone/iPad app by 磊磊 张.)

- Source: https://appshunter.io/ios/app/tap-drill-pocket/id6763918301 (this page in markdown: same URL + `.md`)
- Developer: [磊磊 张](https://appshunter.io/developer/1887198832)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, German (Germany), Japanese, Brazilian Portuguese, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-04-28
- Data updated: 2026-08-31
- User reviews in markdown: https://appshunter.io/ios/app/tap-drill-pocket/id6763918301/reviews.md

## What is Tap Drill Pocket?

Stop hunting through oily wall charts and half-broken calculators. Tap Drill Pocket gives machinists the tap drill, form tap, and clearance hole sizes they need in seconds.

Built for workbench use:

- Cut tap drill recommendations with adjustable thread percentage
- Form tap drill calculations
- Clearance hole fit options: close, normal, free
- Inch, metric, UNC, UNF, NPT, NPS and common machine screw threads
- Number, letter, fractional, and metric drill sizes
- Custom drill kit: show the nearest sizes you actually own
- Favorites and recent threads for repeated shop work
- Works completely offline, with no account and no subscription

Tap Drill Pocket is a reference tool for trained users. Verify critical jobs against your shop standards, material specs, and tap manufacturer's guidance.


## Version history (last 1 release)

### 1.0.0 — 2026-04-28

No release notes.

## More apps by 磊磊 张

- [Twinkle Story](https://appshunter.io/ios/app/twinkle-story/id6761061989)
- [ProofTime: Sourdough Timer](https://appshunter.io/ios/app/prooftime-sourdough-timer/id6761090248)
- [TileCalc - Tile Calculator](https://appshunter.io/ios/app/tilecalc-tile-calculator/id6761092447)
- [HiveLog Bee and Apiary Tracker](https://appshunter.io/ios/app/hivelog-bee-and-apiary-tracker/id6761542862)
- [ReefLog: Reef Tank Tracker](https://appshunter.io/ios/app/reeflog-reef-tank-tracker/id6761686043)
- [KnitCount - Knitting Counter](https://appshunter.io/ios/app/knitcount-knitting-counter/id6761709235)

All apps by 磊磊 张: https://appshunter.io/developer/1887198832

---

*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 2026-08-31.*