The JBO Thread Ring Gauge (GO) for UNC threads, Right Hand, 3A, No. 5 x 40, is a precise go gauge designed to verify external thread diameters quickly and reliably. It’s ideal for engineers, machinists, quality-control teams, and assembly personnel who need fast, confident pass/fail checks on threaded components.

Crafted from hardened steel, this gauge delivers durable performance in demanding shop environments. Its wear-resistant construction stands up to daily use, while the knurled outer edge provides a secure grip and quick orientation during inspections. The Go face is clearly marked to allow instant identification of components that meet the Go limit, helping streamline QC workflows and reduce rework.

• Precise UNC Go Gauge: Accurately checks external thread diameters to UNC standards, delivering fast, reliable go/no-go verification during production and QA.
• Hardened Steel Construction: Built to withstand daily wear in busy workshops, offering long life and minimizing downtime even with frequent use.
• Ergonomic, Easy-Use Design: Knurled outer edge for a secure grip and quick orientation, with a clearly marked Go face to speed identification in tight spaces.

Using the JBO UNC Go Ring Gauge as part of your inspection routine helps you tighten process control, reduce misfits, and accelerate quality sign-off. Its reliable performance and durable materials translate to consistent results across shifts, so you can trust your thread measurements every time.