The JBO Plug Gauge for UNC (STI) right-hand 1/4 x 20, 2B is a precision measuring tool designed specifically to verify UNC STI wire inserts (Helicoil). It provides quick, reliable checks of pitch diameter to ensure inserts fit and perform as intended in assemblies across manufacturing, automotive, and aerospace applications.

Manufactured and assessed in accordance with ANSI/ASME thread system standards, this gauge carries DAkkS calibration for traceable, high-accuracy measurements. It is an ideal choice for quality control environments where consistent thread guidance and insert integrity are essential.

• DAkkS-Calibrated for Precision: DAkkS calibration delivers traceable accuracy, supporting audit trails and precise acceptance testing.
• UNC (STI) Compatibility and 2B Tolerance: Specifically crafted to verify UNC STI wire inserts with 2B tolerance, confirming correct pitch diameter for 1/4 x 20 right-hand threads.
• Rugged, Precision-Engineered Build: Knurled body with precision-machined ends provides durable, repeatable measurements in busy shop environments.

In everyday use, this gauge helps inspectors and technicians quickly validate insert quality, streamline QA workflows, and reduce guesswork when pairing inserts with housings or components. Its calibrated accuracy, UNC STI alignment, and robust construction translate to more consistent results, fewer reworks, and greater confidence across production and assembly processes.