The JBO Thread Ring Gauge (GO) is a precision tool for verifying external metric threads. Engineered for accuracy, it helps inspectors, machinists, engineers, and maintenance teams quickly confirm that a component’s threads match the M55 x 3 metric fine standard.

Built from hardened steel and finished to 6g tolerance, this GO gauge delivers durable performance in demanding shop environments. Its right-hand thread configuration and precisely machined faces make it easy to use and highly reliable for day‑to‑day quality checks.

• Precise GO gauge for metric fine threads (M55 x 3): Directly verifies external thread diameter against the Go limit, enabling fast pass/fail checks during production and inspection.
• Hardened steel construction with 6g tolerance: Heat-treated for exceptional wear resistance, maintaining accurate measurements over thousands of inspections.
• User-friendly design for quick QA integration: Smooth machining and compact form let you set up checks fast, reducing downtime and keeping workflows flowing.

With the JBO Thread Ring Gauge GO, you gain consistent, confident thread verification that speeds up quality control, minimizes rework, and helps your team meet tight specifications. Its durable build, clean measurement surface, and straightforward GO checks support reliable results across busy production lines, whether you’re auditing parts, performing incoming inspection, or maintaining engineering standards.