Thread Gauge
Measure screw pitch & diameter
About
This app transforms your iPhone into a precise thread measurement tool. Simply photograph a screw next to a reference card to accurately determine its pitch and diameter, identifying the closest standard in both metric and imperial units.
What's New in Thread Gauge
1.1
July 7, 2026
Added support for Arabic, Spanish, Chinese (Simplified), German, and Japanese — Thread Gauge now follows your device language automatically. Bug fixes and improvements.
MoreFAQ
How does Thread Gauge measure screw pitch and diameter?
Thread Gauge uses a photograph of a screw placed next to a reference card (like a credit card or SD card) to establish a known scale. It then analyzes the image to compute the thread's pitch and major diameter.
What types of threads can Thread Gauge identify?
Thread Gauge can identify metric coarse and fine (M-series) threads, as well as imperial UNC and UNF threads. It provides both the thread pitch in millimeters or TPI and the major diameter.
Is Thread Gauge free to use?
Yes, Thread Gauge offers your first 3 measurements for free. A single in-app purchase unlocks unlimited measurements, with no ongoing subscription required.
Does Thread Gauge require an internet connection?
No, Thread Gauge processes all measurements directly on your device. This means it runs offline and does not require an internet connection for its core functionality.
What devices does Thread Gauge support?
Thread Gauge is currently supported on iPhones. It is designed to utilize the iPhone's camera for its measurement capabilities.
How accurate is Thread Gauge?
Thread Gauge provides a confidence indicator for its identified standard matches. For standards that are very close, it flags the ambiguity, recommending confirmation with a physical gauge.
Does Thread Gauge collect any personal data or track users?
No, Thread Gauge is designed with privacy in mind. It collects no personal data, and all photographs taken with the app remain on your device.
How often is Thread Gauge updated?
Thread Gauge was last updated on July 1, 2026, with version 1.0. Future updates will likely address bug fixes and potential feature enhancements.