The JBO Thread Plug Gauge (GO) is a precision inspection tool designed to verify internal metric fine threads in tapped holes. Ideal for engineers, quality inspectors, machinists, and workshop technicians, this GO gauge helps you confirm that a hole accepts the correct minimum thread exposure, ensuring parts meet required standards quickly and consistently.

Crafted from hardened steel, the gauge delivers outstanding wear resistance and long service life in demanding production environments. Its Left Hand orientation, metric fine specification (M85 x 2) and 6H tolerance are matched to common thread standards, providing reliable, repeatable readings and easy verification of properly threaded holes.

• Durable hardened steel construction: built to withstand daily use in busy shops while maintaining accuracy and reducing the need for frequent replacements.
• Precise GO gauge for metric fine threads: enables fast, unambiguous hole acceptance checks, speeding up quality control and reducing inspection time.
• Left‑hand, M85 x 2, 6H tolerance: specifically matched to common left‑hand metric fine threads, ensuring accurate fit checks and fewer reworks due to misreadings.

Using this gauge simplifies inspection workflows, improves part consistency, and supports reliable, repeatable measurements across multiple shifts. Rely on its durable build and precise geometry to keep your threaded assemblies within spec from first article through final quality checks.