The JBO Thread Plug Gauge is a precision Go/No-Go tool designed to verify metric fine internal threads. Tuned to M35 x 1.5 with right-hand orientation and a 4H tolerance, it quickly confirms whether threaded holes are within spec for reliable fits.

Ideal for machinists, quality control inspectors, assembly technicians, and serious hobbyists, this gauge speeds up inspection and reduces guesswork. Its compact, hand-held design makes it easy to use in busy workstreams, helping you confirm thread accuracy before proceeding to assembly or production runs.

• Go/No-Go Design for Fast, Reliable Checks: Quickly determine if internal threads meet the specified size and tolerance without trial assembly, saving time and reducing scrap.
• Hardened Steel Construction for Longevity: Built to withstand daily shop use while maintaining accuracy after repeated insertions and inspections.
• Metric Fine Thread Compatibility (M35 x 1.5, Right-Hand, 4H): Precisely matched to common fine-thread applications, delivering consistent results with compatible components and standard parts.

With this gauge in your toolkit, you can streamline internal thread inspection across manufacturing, maintenance, and assembly tasks. The Go/No-Go method speeds checks, minimizes downtime, and helps you meet tight quality standards. The hardened steel construction ensures long life in demanding environments, while the precise M35 x 1.5 calibration guarantees repeatable, reliable results for every hole you test. This leads to faster workflows, fewer reworks, and more confidence in every fit.