Thread Gauges
Precision Gauges for Determining UNC & UNF Thread Pitch
Our thread gauges are designed specifically for measuring the threads per inch (TPI) of UNC and UNF screws. Each gauge contains fine measuring blades that allow you to quickly and accurately identify the number of threads per inch. Please note: these gauges are intended solely for determining the TPI; the exact thread diameter must be measured separately, since different screw sizes can share the same TPI.
Design & Material:
- Precision Steel: Durable, dimensionally stable, and corrosion-resistant for everyday workshop use
- Measuring Blades: Calibrated exclusively for UNC and UNF threads (TPI scale)
Key Features:
- Quick and accurate determination of threads per inch (TPI)
- Helps prevent ordering mistakes and saves time during repair and assembly
- Compact design – ideal for workshops, service calls, and mobile use
- Essential for U.S. vehicles, motorcycles, machinery, and vintage restorations
- Robust construction for long service life and repeated measurements
With these thread gauges you can reliably determine the threads per inch of UNC and UNF screws. To fully identify the thread type, always measure the outside diameter of the screw as well, since different sizes can share the same TPI.
Threads Per Inch Identifier UNC
Threads Per Inch Identifier: Made of steel, with precisely milled teeth. Application: For checking pitches on internal and external threads.Threads Per Inch: 4–64 (22 Identifiers)
Threads Per Inch Identifier UNF
Threads Per Inch Identifier: Made of steel, with precisely milled teeth. Application: For checking pitches on internal and external threads.Threads Per Inch: 12–80 (16 Identifiers)