The JBO Thread Ring Gauge (GO) - UNC - Left Hand - 2A - 3/8 x 16 is a precision measurement tool designed to verify external UNC threads with confidence. It’s ideal for manufacturers, machine shops, inspectors, and engineers who need reliable, fast measurements to confirm thread size and fit.

Crafted from hardened steel, this Go gauge resists wear in demanding environments, delivering long-lasting performance. Its user-friendly design makes it easy to identify properly conforming components, supporting efficient quality control and precision engineering.

• Precise UNC Go Gauge for Left-Hand Threads: Verifies external thread diameter and fit for 3/8 x 16 UNC left-hand threads, enabling rapid conformance checks and reducing rework.
• Hardened Steel Construction for Longevity: Built to resist wear in busy workshops, delivering long tool life and stable accuracy across many measurements.
• User-Friendly Go-Only Design for Fast Inspections: The GO gauge design allows quick, clear pass/fail determinations, improving inspection speed and training efficiency.

Using the JBO Thread Ring Gauge (GO) helps ensure consistent thread measurements, speeds up quality checks, reduces downtime, and supports reliable production workflows—so you can trust your parts meet exact UNC specifications every time.