The JBO Thread Plug Gauge is a precision go/no-go tool designed to quickly verify threaded holes for BSW right-hand threads. Sized for 1/8 x 40 with a medium class tolerance, it helps machinists, inspectors, and assembly teams confirm that holes meet spec—reducing guesswork and rework in production lines.

Built for everyday shop use, this compact gauge features a comfortable knurled grip and robust end fittings for reliable readings in busy environments across manufacturing, automotive, and aerospace applications. Whether you’re setting up a new fixture or verifying incoming parts, it delivers clear pass/fail results with consistent performance.

• Go/No-Go Quick Verification: Instantly identify threads that conform or do not conform, speeding inspections and reducing downtime.
• Right-Hand, Medium Class, 1/8 x 40 Size: Precisely designed to match standard BSW right-hand threads, providing reliable measurements and compatibility with common components.
• Ergonomic, Durable Construction: Knurled grip and robust end fittings provide comfortable handling and long-lasting performance in busy workshops.

With this gauge in your toolbox, you’ll streamline thread inspections, cut down on rework, and ensure every part that moves to assembly meets spec. Its go/no-go action, precise right-hand 1/8 x 40 sizing, and comfortable design translate to faster checks, fewer misfits, and more consistent results across manufacturing, automotive, and aerospace applications.