The JBO Plug Gauge for UNF (STI) is a precision measurement tool designed to verify UNF screw-thread inserts (STIs) with a right-hand orientation. Sized at 1/4 x 28 with a 2B tolerance, it’s an essential aid for QA labs, machine shops, automotive, and aerospace environments where accurate insert fit matters. Manufactured and assessed to ANSI/ASME thread standards, this gauge delivers reliable checks on threaded inserts and is calibrated to DAkkS standards for traceable accuracy, ensuring measurement data stands up to audits and quality control requirements.

• DAkkS-calibrated, traceable accuracy: Ensures measurements are backed by formal calibration data, reducing uncertainty and supporting robust quality documentation.
• UNF (STI) right-hand design with pitch-diameter checks: Specifically tailored for UNF STI inserts, enabling quick, reliable pitch-diameter verification to confirm proper fit.
• Rugged, knurled construction: Durable, easy-to-handle design that resists slipping in busy workshops and provides repeatable results over many uses.

This plug gauge streamlines inspection workflows by providing fast, repeatable checks that confirm inserts meet specification before assembly. With traceable calibration, you’ll save time during audits and avoid costly rework from misfit inserts, while the sturdy, handheld design keeps it reliable in demanding production environments.