The JBO Thread Ring Gauge (GO) – Metric Fine is a precision inspection tool designed to verify the outer diameter of external threads with a clear GO limit. It’s essential for quality control on fasteners, fittings, and machined components, delivering fast, repeatable checks for critical sizes. This right-hand gauge is tailored for fine-pitched metric threads, including M78 x 1.5, and is trusted on shop floors and in production environments.

Crafted from hardened steel, it stands up to daily use in demanding settings, delivering long-lasting performance and reliable results while resisting wear and corrosion.

• Reliable GO gauge function: Quickly confirm whether the external thread diameter meets the GO limit for fast, repeatable quality checks on production lines.
• Durable hardened steel construction: Built to withstand daily handling, resisting wear and corrosion for long-lasting accuracy in harsh workshop environments.
• Precise metric fine sizing for right-hand threads: Engineered specifically for fine-pitched metric threads like M78 x 1.5, reducing guesswork and ensuring consistent inspection results.

When you add this gauge to your inspection toolkit, you gain confidence that every part meets specification before it proceeds down the line. Its rugged construction minimizes downtime and replacement costs, while the precise metric fine sizing delivers consistent, accurate checks across a range of components—from fasteners to fittings—accelerating inspections and supporting tighter quality control.