The JBO Thread Plug Gauge is a metric fine Go/No-Go gauge designed for precise internal threads. It targets right-hand M31 x 0.5 threads with a 6H tolerance, making it a dependable choice for engineers, machinists, quality inspectors, buyers, and hobbyists who require quick, confident checks during assembly and maintenance.

In everyday workshop use, the Go/No-Go design lets you quickly verify thread holes, delivering decisive pass/fail feedback so you can move on to the next task without guesswork.

• Go/No-Go quick checks: Instantly confirm whether a threaded hole meets tolerance, speeding inspections and reducing downtime.
• Hardened steel construction: Built to endure busy shop environments, providing long tool life and reliable performance through many cycles.
• Metric fine threads compatibility (M31 x 0.5) with 6H right-hand: Precisely matched to common metric threads, ensuring accurate, repeatable measurements across parts and fixtures.

This gauge supports efficient quality control and accurate assembly by delivering clear, durable, and repeatable results. Its robust construction and targeted thread specification help streamline measurements, minimize rework, and enhance confidence in every fit.