The JBO Plug Gauge - UNF (STI) Heli Coil Gauge is a precision measuring tool designed to verify the pitch diameter and fit of threaded insert assemblies used in UNF/ STI applications. Manufactured to ANSI/ASME thread standards, this gauge supports quality control across manufacturing, automotive, and aerospace environments by delivering consistent, reliable checks of plug gauge measurements.

Built for right-hand operation with a 2B tolerance class and a 5/16 x 24 size, this calibrated gauge carries DAkkS calibration to provide traceable results you can record for audits and compliance. Designed to be durable in busy workshops, it helps technicians quickly confirm inserts meet exact specifications before assembly.

• DAkkS-calibrated for traceable accuracy: The gauge is calibrated with DAkkS, offering internationally recognized traceability and ensuring pitch-diameter measurements are reliable for every inspection.
• ANSI/ASME standard-conformed design: Carefully manufactured to ANSI/ASME thread system standards, providing consistent, interchangeable use with other precision tools and ensuring valid measurement results.
• Right-hand, 2B, 5/16 x 24 for UNC/STI inserts: Optimized for UNC/STI threaded inserts with easy handling in hand, delivering precise checks of pitch diameter and fit to support proper assembly and performance.

This plug gauge helps you streamline quality control by providing fast, repeatable checks that confirm your helicoil inserts are correct for the application. With the DAkkS-traceable calibration and standardized dimensions, you can reduce guesswork, minimize rework, and maintain consistent performance across batches, suppliers, and assembly lines. The robust, knurled construction resists wear in demanding environments, helping your team trust every measurement and keep production moving.