Starrett 155 Screw Pitch Gauge 27 Leaves 2-1/4 to 28 TPI

The Starrett No. 155 Screw Pitch Gauge is a precision tool used to quickly and accurately identify the thread pitch of screws, bolts, and threaded fasteners. With 27 hardened steel leaves covering a range of 2 to 28 threads per inch (TPI), this gauge makes thread identification fast and reliable for machinists, mechanics, and engineers.

Each leaf is clearly stamped with its corresponding TPI value, allowing users to simply fan through the leaves and match the teeth to the unknown thread until a perfect fit is found. The leaves are riveted together in a compact, pocket-friendly design with a protective outer cover for durability and easy storage.

Key Features:

• 27 leaves covering 2 through 28 threads per inch
• Hardened and tempered steel construction for long-lasting accuracy
• Each leaf clearly stamped with TPI designation
• Compact folding design with protective cover
• Measures Unified National (UN) inch thread series
• Ideal for identifying thread pitch on bolts, screws, and tapped holes
• Fits easily in a toolbox, apron pocket, or field kit

The Starrett 155 is part of Starrett's trusted line of precision measuring tools and is manufactured to exacting standards. It is an essential reference tool for any shop working with threaded fasteners, ensuring the correct tap, die, or mating fastener is selected every time.