Tap Drill Pocket
Thread Chart for Machinists
Only for iPhone
$2.99 · Designed for iPhone. Not verified for macOS.
iPhone
Find tap drill, form tap, and clearance hole sizes in seconds. Offline thread charts, custom drill kit, NPT presets, no subscription.
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.
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The developer, 磊磊 张, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 磊磊 张
- Size
- 678.9 KB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 5 more
- English, German, Japanese, Portuguese, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Leilei Zhang
