The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It helps engineers, machinists, inspectors, and assembly teams quickly verify that internal threaded holes meet the exact size requirements.

Built for durable performance, this left-hand Go/No-Go gauge uses a precise M17 x 0.5 thread form and 6H tolerance to confirm fit and clearances. Crafted from hardened steel, it delivers long-lasting accuracy in busy workshops and production environments.

• Go/No-Go quick validation: Quickly determine whether the hole thread passes or fails the specification, reducing inspection time and eliminating guesswork.
• Left-hand M17 x 0.5 metric fine-thread compatibility: Precisely sized for this specific thread form and direction, ensuring accurate checks for left-hand threaded holes.
• Hardened steel for durability: Built to resist wear and maintain measurement accuracy through repeated use in demanding shop conditions.

Using this plug gauge streamlines setup and quality control by delivering reliable, repeatable results. It helps shorten downtime, cut rework, and ensure consistent thread performance across batches, making it a dependable addition to your measurement toolkit.