The JBO Thread Ring Gauge (NoGo) – Metric Fine – Right Hand – 6g – M138 x 1.5 is a precision external thread gauge designed for fast, reliable inspection of threaded components. Built for engineers, machinists, quality teams, and workshop technicians, it provides a clear go/no-go indication to confirm that a part’s outer thread diameter and pitch meet the required standard. Crafted from hardened steel, it resists wear in demanding environments, delivering durable, repeatable performance over many uses. A red alignment mark and knurled ring edge help you set up quickly and grip securely, even when wearing gloves.

• Go/No-Go rapid verification: Quickly confirms whether a thread is within tolerance, speeding up quality checks and reducing rework on assemblies and fixtures.
• Hardened steel construction: Built to withstand daily shop use with excellent wear resistance, ensuring long tool life and consistent measurements.
• Metric fine specification (M138 x 1.5, right-hand): Precisely tuned for fine-pitch metric threads, enabling reliable diameter verification and easy compatibility with standard components in your workflow.

Using this gauge helps streamline inspection, catch out-of-spec parts before they influence assembly, and maintain tight tolerances across production and repair work. Its robust construction, clear go/no-go feedback, and user-friendly design support faster decisions, reduce downtime, and improve overall thread quality in manufacturing and maintenance environments.