The JBO Thread Ring Gauge (GO) for Metric Coarse threads is a precision inspection tool used to verify external threads on components. Designed for engineers, machinists, quality control teams, and workshop technicians, it helps confirm parts meet the exact size and thread form required.

This left-hand version is calibrated for M3 x 0.5 coarse threads with a 6g tolerance. Built from hardened steel for durability in busy shops, it delivers consistent go checks with quick, reliable feedback during manufacturing and inspection tasks.

• Hardened steel construction: Resists wear and deformation in daily use, extending tool life and keeping measurements stable even after heavy use.
• Precise GO gauge for metric coarse threads (M3 x 0.5, 6g): Delivers repeatable, accurate go checks so parts meet spec and fit correctly the first time.
• Left-hand thread compatibility and ergonomic design: Specifically engineered for left-hand threads with a knurled outer edge for secure grip, making alignment quick and reliable, even with gloves.

Using the JBO GO thread ring gauge improves workflow by delivering fast, confidence-inspiring checks that reduce rework and returns. Its rugged construction minimizes downtime, while its calibrated tolerances ensure interchangeability across components that rely on metric coarse threads. For quality control, manufacturing, and maintenance teams, this gauge provides dependable, repeatable results that support consistent performance and compliance with industry standards.