The JBO Plug Gauge for UNC (STI) is a Right Hand, 2B, 5/8 x 11 calibrated gauge designed for precise inspection of UNC thread inserts (STIs). It helps technicians, buyers, and engineers verify pitch diameter and thread form to ensure UNC STI inserts will assemble correctly and perform reliably in manufacturing, automotive, and aerospace applications.

• DAkkS-calibrated and traceable: Provides verified, repeatable measurements with documentation suitable for QA records and supplier audits.
• ANSI/ASME UNC (STI) compliant design: Specifically built to UNC STI standards, ensuring consistent inspection criteria and reliable pass/fail decisions.
• Direct pitch diameter verification: Enables quick, accurate assessment of the critical dimension that governs fit and performance of threaded inserts.

Across production and inspection workflows, this gauge streamlines quality checks, reduces guesswork, and supports compliant reporting. Its calibrated accuracy gives you confidence in every measurement, helping to minimize downtime, improve first-pass results, and maintain consistent part quality from receipt through final assembly.