The JBO Plug Gauge - UNF (STI) Heli Coil Gauge is a precision, calibrated plug gauge designed to inspect Helicoil‑style screw-thread inserts. This right‑hand gauge, sized 3/8 x 24 and class 2B, helps technicians quickly verify insert engagement and fit across manufacturing, automotive, and aerospace applications. Its knurled body and color‑coded end caps provide a secure grip and intuitive orientation in busy shop environments.

Manufactured and assessed to ANSI/ASME thread standards, this gauge aligns with established industry specifications for STI inserts. It is calibrated to DAkkS standards, offering traceable accuracy for quality audits and supplier qualification. The tool’s robust construction is built to endure daily use in workshop conditions, delivering dependable performance over time.

• ANSI/ASME-compliant gauge design: Built to industry thread standards, ensuring consistent, repeatable inspections that align with STI insert specifications and reduce ambiguity in QA checks.
• Precise pitch-diameter verification: Enables accurate measurement of pitch diameter to guarantee proper insert fit and reliable performance in assembled components.
• DAkkS-calibrated for traceable accuracy: Provides documented, DAkkS-traceable calibration for audits, quality systems, and supplier qualification.

Using the JBO UNF (STI) Plug Gauge helps you streamline inspection workflows, reduce rework from misfits, and maintain confidence across production runs. With its durable build, industry-standard compliance, and traceable calibration, you can trust consistent results from the first part to the last.