The JBO Thread Plug Gauge is a precision tool designed for metric coarse threads. It's ideal for machinists, quality teams, and workshop professionals who need fast, reliable checks of threaded holes. With a compact, rugged design and a clear go/no-go framework, it helps confirm the correct hole size for M1 x 0.25 coarse threads right away.

Built to endure daily use, the gauge uses hardened steel for long-lasting accuracy. The left-hand orientation is suited for applications with left-handed threads, making this gauge a versatile addition to your inspection toolkit. The 5H specification ensures compatibility with common coarse-thread standards while keeping measurements consistent over time.

• Go/No-Go design for fast, reliable checks: Easily determine if a hole meets tolerance with a simple pass/fail test, speeding up setup and reducing guesswork.
• Hardened steel construction for durability: Withstand heavy use and resist wear, preserving accuracy across thousands of measurements.
• Left-hand configuration for metric coarse threads (5H, M1 x 0.25): Tailored for left-hand threads and coarse metric threads, ensuring proper engagement and reliable results in relevant applications.

In use, this gauge helps you shorten inspection times, reduce rework, and maintain consistent thread quality across assemblies. Its robust construction and clear pass/fail thresholds give you confidence during setup and quality checks, supporting efficient manufacturing and maintenance across projects that rely on metric coarse threading.