# Screw Size & Drill Bit Chart — Bolt, Gauge, Tap & Pilot Hole

> Bolt, Gauge, Tap & Pilot Hole (iPhone/iPad app by Phuc Pham.)

- Source: https://appshunter.io/ios/app/screw-size-and-drill-bit-chart/id6772276125 (this page in markdown: same URL + `.md`)
- Developer: [Phuc Pham](https://appshunter.io/developer/1893081423)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-05-28
- Data updated: 2026-08-22
- User reviews in markdown: https://appshunter.io/ios/app/screw-size-and-drill-bit-chart/id6772276125/reviews.md

## What is Screw Size & Drill Bit Chart?

Never split a board or strip a screw again. Keep every screw gauge, bolt size and drill bit in your pocket, with the exact pilot hole for the material in front of you, fully offline.

WHAT YOU GET
- Every screw size: US gauge numbers, wood screws and metric M-sizes with diameters, threads and heads
- Material-aware pilot, clearance and countersink sizes for softwood, hardwood, plywood and metal
- The full drill-bit chart: fractional, number, letter and metric bits with decimal equivalents
- Diameter and thread finder: enter a size and get the nearest screw or bit instantly
- Head styles and drive types explained: Phillips, Pozidriv, square, Torx and hex

HOW IT WORKS
- Pick your screw by gauge, size or type
- Choose the material you are driving into
- Read the exact pilot, clearance and countersink bit to grab

BUILT FOR THE WORKSHOP
- Works fully offline, so no signal is needed in the garage or on site
- No accounts, no ads, no tracking; everything stays on your device
- Fast, native and clutter-free

Full access to pilot holes, the complete drill-bit chart and the size finder unlocks with a subscription: choose weekly or yearly, or pay once for lifetime access.

Stop guessing and start building. Get the size right the first time.

Questions or feedback? Email tphuc.work@gmail.com
Terms of Use https://web-levi.web.app/terms
Privacy Policy https://web-levi.web.app/privacy-policy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Countersink Pro, Weekly | $2.99 | per 7 days |
| Thread Finder, Yearly | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Fastener Guide, One-Time | $29.99 | one-time |



## Version history (last 3 releases)

### 1.2.0 — 2026-07-21

Introducing Premium with new features. Plus bug fixes and improvements.

### 1.1.0 — 2026-06-10

Introducing ScrewGuide Premium with new features. Plus bug fixes and improvements.

### 1.0 — 2026-05-28

No release notes.

## More apps by Phuc Pham

- [Spy Cam Detector: Bug Radar](https://appshunter.io/ios/app/spy-cam-detector-bug-radar/id6763095044)
- [Audio Bible: KJV Scripture](https://appshunter.io/ios/app/audio-bible-kjv-scripture/id6763095570)
- [Feng Shui Compass & Horoscope](https://appshunter.io/ios/app/feng-shui-compass-and-horoscope/id6763224597)
- [Year Progress: Days & Percent](https://appshunter.io/ios/app/year-progress-days-and-percent/id6767788732)
- [AI Email Writer: Smart Reply](https://appshunter.io/ios/app/ai-email-writer-smart-reply/id6767789113)
- [Alarm Clock: Wake Up Missions](https://appshunter.io/ios/app/alarm-clock-wake-up-missions/id6767789239)

All apps by Phuc Pham: https://appshunter.io/developer/1893081423

## Related topics

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

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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 2026-08-22.*