The JBO Plug Gauge - Metric Fine (STI) is a precision measuring tool designed to verify metric Screw Thread Inserts (STIs) such as Heli-Coil inserts. Built with a right-hand orientation and sized for M8 x 1 threads, it carries a 6H tolerance and comes calibrated with DAkkS traceability. This gauge helps quality teams, machinists, and inspectors confirm that inserts meet ANSI/ASME metric STI standards, delivering reliable fits and consistent performance across assemblies.

Designed for busy workshop environments, the gauge features a knurled body for a secure grip and color-coded reference rings to speed size identification. Its robust construction supports frequent measurements, while the DAkkS-calibrated accuracy provides auditable validation for audits and supplier quality programs.

• DAkkS-calibrated, ANSI/ASME-compliant metric STI verification: Provides traceable, high-accuracy checks for M8 x 1 inserts, reducing guesswork and rework in QA and production.
• Right-hand design aligned with standard STI checks: Enables fast, repeatable measurements in busy lines, improving setup speed and consistency.
• Durable, user-friendly construction with color-coded rings: Knurled grip for secure handling and quick size identification, helping you work faster with fewer mistakes.

Using the JBO Plug Gauge delivers reliable, repeatable results that streamline your quality checks and production workflow. The DAkkS-traceable calibration gives you auditable evidence of conforming inserts, while the right-hand design and ergonomic grip reduce inspection time and operator fatigue. Whether you’re verifying incoming STI inserts or validating in-process assemblies, this gauge helps you maintain tight tolerances and consistent performance across your operations.