The JBO Thread Plug Gauge is a left-hand, metric fine-thread Go/No-Go gauge designed to verify internal threads with speed and precision. Sized for M19 x 1 holes in the 6H class, it helps ensure mating parts fit accurately without guesswork in critical assemblies.

Built for daily workshop use, this gauge features hardened steel construction and a textured grip, delivering long-lasting performance and confident handling during inspections.

• Go/No-Go quick checks: Two ends provide go and no-go limits for M19 x 1 threads, enabling fast, pass/fail verification and reducing rework.
• Left-hand, metric fine-thread compatibility (M19 x 1, 6H): Designed for left-hand thread applications and metric fine threads, ensuring precise checks for the corresponding 6H-class holes.
• Durable hardened steel with knurled grip: Wear-resistant construction stands up to daily use, while the textured grip allows secure handling and accurate positioning during inspections.

This gauge helps streamline threaded-hole inspection, supporting faster setup, reliable results, and longer tool life in engineering shops, manufacturing lines, and maintenance environments. With its rugged build and precise Go/No-Go functionality, you can trust it to deliver consistent measurements and help you maintain tight quality standards.