The JBO Thread Ring Gauge (GO) is a precision inspection tool designed to verify external metric coarse threads. Specifically configured for left‑hand M30 x 3.5 LH threads, it helps ensure mating parts will thread together smoothly and reliably.

Crafted from hardened steel for lasting durability in busy workshop environments, this GO gauge resists wear and maintains accurate measurements through repeated use. Its simple, user‑friendly design supports fast, repeatable checks in quality control and precision engineering.

• Rugged Hardened Steel Construction: Built to withstand daily handling in busy shops while preserving measurement accuracy and long life.
• 6g-Toleranced M30 x 3.5 LH Machining: Precisely machined for metric coarse left‑hand threads with 6g tolerance, ensuring consistent go checks and reliable fit.
• Clear Go-Style Indication: Designed to provide a straightforward pass/fail result, reducing inspection time and minimizing rework.

This gauge helps streamline thread inspection, improves workflow, and supports consistent, high-quality performance across production runs. By delivering quick, confident checks of external M30 x 3.5 LH threads, it helps you prevent mismatches and ensure reliable assembly in demanding applications.