The JBO Plug Gauge is a precision tool designed to inspect UNC (Unified National Coarse) Threaded Inserts (STIs) to ensure accurate sizing and reliable performance in manufacturing, automotive, and aerospace applications. This right-hand, 2B gauge is sized No. 5 x 40 and comes with DAkkS-calibrated accuracy, providing confidence in every measurement.
Manufactured and assessed to ANSI/ASME thread standards, it delivers consistent results that inspectors and machinists can trust across audits and production runs.

• DAkkS-calibrated, traceable accuracy: DAkkS calibration provides verifiable, standards-compliant measurement precision you can rely on for QA and audit readiness.
• Right-hand, 2B UNC STI design: Specifically configured for No. 5 x 40 UNC STI inserts with right-hand threads, facilitating straightforward setup and reducing measurement ambiguity on the shop floor.
• Pitch diameter verification for UNC STI inserts: Enables precise measurement of pitch diameter to confirm proper insert fit and reliable performance in assembled joints.

Using the JBO Plug Gauge streamlines quality checks by delivering fast, dependable pitch-diameter verification that aligns with ANSI/ASME standards. The DAkkS-traceable calibration gives you audit-ready documentation, while the targeted size and orientation reduce measurement guesswork and downtime. With this gauge, you can ensure consistent insert quality across batches, minimize rework, and maintain smooth, reliable performance in every assembly.