The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine-thread holes, specifically engineered for M20 x 1 right-hand threads with a 6H tolerance. Constructed from hardened steel, it’s built to deliver reliable, repeatable checks in demanding shop environments, QA labs, and production floors.

Use this gauge to quickly verify hole acceptance without guesswork, speeding up inspection and reducing rework. The robust construction ensures accurate performance over many cycles, maintaining reliability even in daily use.

• Go/No-Go design for fast verification: Quickly confirm whether a threaded hole meets the exact M20 x 1 right-hand spec, minimizing inspection time and delays.
• M20 x 1 fine-thread compatibility: Precisely tuned for metric fine threads to ensure accurate hole checks and proper mating with components.
• Hardened steel for lasting durability: Built to resist wear and maintain measurement accuracy, delivering dependable performance over the long service life.

This plug gauge helps you maintain consistent quality across parts and assemblies, streamline your measurement workflow, and reduce the risk of misfits in critical threads. With its rugged construction and precise sizing, you can trust it to simplify inspections, speed up setups, and support reliable, repeatable results in every batch.