The JBO Thread Plug Gauge is a precision Go/No-Go gauge designed for metric fine threads. It’s ideal for machinists, quality inspectors, and technicians who work with threaded holes, providing a fast, reliable check of M31 x 0.75 right-hand threads to 6H tolerance.

Crafted for durability, the gauge combines a hardened steel body with a knurled grip for easy handling in busy workshops. This construction stands up to daily use and resists wear and corrosion, helping you rely on accurate checks when it matters most.

• Go/No-Go Quick Check: Use the go gauge to confirm a hole will accept a threaded component, while the no-go gauge helps verify the hole does not exceed tolerance—delivering fast, repeatable pass/fail results and reducing inspection time.
• Durable Hardened Steel Construction: Built to endure daily handling in workshops, with wear- and corrosion-resistance that extends service life and maintains accuracy over time.
• Precise Metric Fine Thread (M31 x 0.75, 6H) — Right-Hand: Specifically matched to standard metric fine-thread holes, ensuring correct orientation and reliable testing of pitch and fit for common assemblies.

With the JBO Thread Plug Gauge in your QC toolbox, you’ll streamline threaded-hole verification, cut downtime, and improve assembly reliability. It provides clear, consistent results, helps prevent misfit components, and supports repeatable quality across manufacturing and maintenance workflows.