The JBO Thread Plug Gauge (GO) – Metric Fine – Left Hand – 6H – M65 x 1.5 is a precision tool designed to verify inside threaded holes with speed and accuracy. Built for engineers, machinists, inspectors, and shop floor teams, it helps confirm that internal threads meet exact size and tolerance requirements for reliable assembly and performance.

This GO gauge provides a clear, immediate indication when a hole accepts the threaded plug, enabling fast quality checks and consistent results across production runs. With a left‑hand metric fine thread (M65 x 1.5) and a 6H tolerance, it integrates smoothly into LH-threaded applications and aligns with common industry standards for dependable inspection.

• Precise GO fit for fast hole checks: Quickly verify that internal threads meet size and tolerance, speeding up inspection and reducing rework.
• Rugged, hardened steel construction: Durable, wear‑resistant material stands up to daily use in busy workshops, preserving accuracy over time.
• Left‑hand metric fine thread with 6H tolerance: Specifically engineered for LH threaded holes, delivering consistent engagement and reliable results with standard precision limits.

Incorporating this gauge into your QC workflow helps you confirm thread integrity at a glance, streamline inspection routines, and ensure parts meet spec before moving to assembly, reducing downtime and returns.