The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It’s ideal for machinists, engineers, quality teams, and workshop technicians who need fast, reliable checks to confirm hole size and thread engagement. Designed for left-hand thread applications, this gauge provides clear Go/No-Go guidance to ensure parts fit correctly.

• Go/No-Go efficiency: Quickly determine whether the threaded hole meets tolerance with a simple pass/fail check, speeding up inspections and reducing rework.
• Durable hardened steel construction: Built to withstand daily use in busy shops, resisting wear and delivering consistent performance over time.
• Precise metric fine-thread reference (M16 x 0.75, 6H): Provides a reliable standard for verifying hole size and thread engagement, ensuring consistent results across parts and assemblies.

Use this gauge to streamline quality checks, accelerate assembly, and achieve repeatable results in production or repair environments. The clear Go/No-Go feedback helps you maintain workflow efficiency and confidence in threaded assemblies from batch to batch.