# Tap & Drill Size Reference — UNC UNF Metric Thread Chart

> UNC UNF Metric Thread Chart (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/tap-and-drill-size-reference/id6761641150 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities, Productivity
- Price: $0.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-04-08
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/tap-and-drill-size-reference/id6761641150/reviews.md

## What is Tap & Drill Size Reference?

Standing at the mill and can't remember the right drill size for an M8x1.25 tap? This app gives you the answer faster than flipping through a chart book.

Select thread type (UNC, UNF, Metric), pick your size, and instantly see the recommended tap drill, clearance drill, thread percentage, and decimal equivalent. No searching, no guessing.

TAP DRILL CALCULATOR:
Select thread standard and size to get tap drill size, clearance drill, and thread percentage. Covers M3 to M24 metric, #0 to 1 inch imperial.

DRILL CHART:
Full reference table with tap drill, clearance drill, and thread percentage for every common size. One-tap lookup.

THREAD SPECIFICATIONS:
Detailed data for each size: pitch, threads per inch (TPI), major diameter, minor diameter, and pitch diameter for UNC, UNF, and ISO Metric standards.

FAVORITES:
Save your most-used tap and drill combinations for instant access on repeat jobs.

Works completely offline. No account required. Built for machinists, CNC operators, and fabrication shops who need fast, accurate thread data at the machine.


## Version history (last 3 releases)

### 1.0.2 — 2026-07-07

Added a More Pro Tools section to discover related field calculators.

### 1.0.1 — 2026-04-13

Bug fixes and performance improvements.

### 1.0 — 2026-04-08

No release notes.

## More apps by Shanghai Sheyuan Network Technology Co., Ltd.

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- [Stamping Tonnage Calculator](https://appshunter.io/ios/app/stamping-tonnage-calculator/id6760528007)
- [CNC Thread Drill Hole Calc](https://appshunter.io/ios/app/cnc-thread-drill-hole-calc/id6760606318)
- [Orifice Jet Flow](https://appshunter.io/ios/app/orifice-jet-flow/id6760607248)
- [Concrete Block Wall Est](https://appshunter.io/ios/app/concrete-block-wall-est/id6760607814)

All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

## Related topics

[drill size charts](https://appshunter.io/ios/topics/drill-size-charts) · [drill maker](https://appshunter.io/ios/topics/drill-maker)

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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 2026-08-27.*