The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine threads, including M20 x 0.75 with right-hand orientation and 6G tolerance. It’s ideal for machinists, quality inspectors, and assembly technicians who need fast, dependable thread checks on holes.

With its robust, hardened steel construction, this gauge withstands daily use in busy workshops while delivering reliable readings and long service life. The Go/No-Go design allows quick, decisive checks of threaded holes so parts thread together smoothly and consistently.

• Go/No-Go speed: Quickly verify whether internal threads meet spec, enabling rapid decisions and reducing inspection bottlenecks on the shop floor.
• Hardened steel durability: Built to resist wear and maintain accuracy through heavy use, delivering dependable performance over thousands of checks.
• Metric fine-thread accuracy (M20 x 0.75, right-hand, 6G): Precisely matched to the target thread size and orientation, ensuring consistent acceptance across parts and assemblies.

Using the JBO plug gauge streamlines quality control and assembly workflows. Its compact, handheld design and knurled grip help you perform precise hole checks in tight spaces, keep production moving, and document repeatable results with confidence.