The JBO Plug Gauge for UNF (STI) Helicoil inserts is a precision measurement tool designed to verify that threaded inserts meet exact size and fit requirements. This right-hand gauge, configured as 3B with a 1/4 x 28 size, is calibrated for traceability with DAkkS calibration and is manufactured in accordance with ANSI/ASME thread standards. It’s built to deliver reliable checks during production, quality control, and maintenance, helping you ensure inserts will assemble correctly in real-world applications.

• DAkkS-calibrated, ANSI/ASME-compliant: Provides traceable, accurate measurements that align with accepted thread standards, delivering consistent results across production lots.
• Precise pitch-diameter verification: Enables reliable measurement of the critical pitch diameter to confirm proper fit and performance of threaded inserts in assemblies.
• Rugged, right-hand design with knurled grip: Built for daily use in busy workshops, offering durability and comfortable handling for repeat inspections.

This plug gauge streamlines quality checks by delivering dependable, repeatable measurements, reducing inspection time and the risk of misfits. With DAkkS calibration backing its accuracy, you can trust the gauge to support tighter tolerances and more consistent results in manufacturing, automotive, and aerospace environments.