The JBO Thread Plug Gauge is a precision, dual‑ended Go/No‑Go gauge designed to verify threaded holes quickly and reliably. With a textured knurled body for easy handling and dual ends that mirror the target UNC left‑hand thread, it makes inspection straightforward in busy shops—from manufacturing floors to automotive and aerospace maintenance.

This gauge features a Left Hand UNC configuration with a No. 5 x 40 size and a 2B tolerance class, providing clear go or no‑go feedback on each check. The compact, durable construction is built to withstand repeated use in demanding environments, helping inspectors prevent misfits and ensure consistent thread quality.

• Go/No-Go verification for fast acceptance: Quickly determine whether threads are within spec, reducing inspection time and preventing faulty assemblies.
• Left-hand UNC thread capability: Specifically engineered for left-hand threaded components, eliminating guesswork and read errors in more complex assemblies.
• Precise No. 5 x 40, 2B tolerance: Delivers consistent, repeatable results that align with Unified thread standards for reliable quality control.

Used across industries to streamline quality checks, this plug gauge helps you shorten inspection cycles, reduce rework, and maintain dependable performance in production and maintenance tasks. Its robust design and intuitive go/no-go feedback empower teams to make confident decisions and keep projects on schedule.