The JBO Thread Ring Gauge (GO) for UNC external threads is a precision inspection tool designed to verify external thread size against the GO tolerance class (2A). Sized for 1-3/4 in diameter with 5 threads per inch, right-hand UNC threads, this gauge is ideal for machinists, inspectors, and quality teams who need fast, reliable pass/fail checks on threaded components.

Crafted from hardened steel, it’s built to withstand daily use in busy workshops. The durable, wear-resistant design maintains accurate ring geometry across repeated inspections, supporting consistent results in high-volume environments.

• Exact UNC 1-3/4 in. x 5 TPI Go Ring Gauge (Right-Hand, 2A): Delivers precise go/no-go checks to confirm external UNC threads meet the standard size and tolerance, helping you quickly separate compliant parts from out-of-specs.
• Hardened steel construction: Ensures long-lasting durability and wear resistance in demanding work environments, preserving accuracy over thousands of inspections.
• Ergonomic knurled exterior for secure handling: The textured edge and smooth face allow easy placement and quick alignment, reducing setup time and downtime during inspections.

With the JBO Thread Ring Gauge, you gain a fast, dependable method to verify thread dimensions, streamline your quality-control process, and improve overall manufacturing reliability. The combination of precise geometry, durable materials, and thoughtful design helps you consistently identify conforming parts, minimize rework, and maintain tight tolerances across assemblies.