The JBO Thread Plug Gauge is a precision inspection tool designed specifically for metric coarse threads. It helps you verify threaded holes quickly and accurately, ensuring parts thread in smoothly and fit correctly before final assembly. With its go/no-go design, this gauge makes quality checks fast and reliable for machinists, inspectors, and assembly teams.

Built to endure the rigors of daily workshop use, the gauge is made from hardened steel to resist wear and maintain accuracy over time. It features a right-hand orientation and is specified for 6H tolerance with M33 x 3.5 coarse threads, providing standardized, repeatable results across parts and production runs.

• Go/No-Go quick checks: Quickly determine if a hole meets the required tolerance with a simple pass/fail action, speeding up inspections and reducing guesswork.
• Durable hardened steel construction: Withstands heavy use in demanding environments while preserving accuracy and long service life.
• Right-hand, 6H M33 x 3.5 coarse thread calibration: Ensures reliable fitment with standard coarse-thread components and consistent results across lots.

In everyday use, this gauge helps you streamline quality control, cut downtime, and deliver consistent threaded-hole performance. Its reliable construction and precise go/no-go checks give you confidence in every inspection, supporting smoother workflows and dependable assembly outcomes.