The JBO Thread Plug Gauge is a precision tool designed for metric fine-thread holes. This left-hand Go/No-Go gauge helps engineers, machinists, QA teams, and assembly professionals quickly verify hole size and thread fit, ensuring mating parts go together with confidence. Built for daily shop use, it features a hardened steel body and a knurled grip for durable, dependable handling.

• Go/No-Go quick checks: Quickly verify threaded holes with clear pass/fail signals, speeding inspections and reducing guesswork.
• Left-hand metric fine-thread support (M38 x 1, 6H): Specifically designed for left-handed holes to ensure accurate engagement and consistent measurements in common metric sizes.
• Rugged, knurled, hardened steel body: Durable construction stands up to daily shop use, while the textured handle provides secure handling during inspections.

Used to streamline inspection, minimize rework, and ensure consistent results across production runs, the JBO Thread Plug Gauge delivers reliable, repeatable checks from part to part. Its specialized metric focus, clear Go/No-Go feedback, and robust construction help you maintain high-quality mating interfaces and keep workflows moving smoothly.