The JBO Thread Ring Gauge (GO) - Metric Fine is a precision tool for verifying external thread diameters on fasteners, fittings, and machined parts. Built for metric fine threads with left-hand compatibility, it helps engineers, inspectors, and buyers quickly confirm conformance to M12 x 1.25 with a 6g tolerance, while its hardened steel construction delivers lasting durability in demanding shops.

• Precise metric fine thread verification (M12 x 1.25, 6g): Delivers accurate GO checks of external thread diameter to the exact specification, enabling fast pass/fail decisions in QA and manufacturing.
• Hardened steel construction for durability: resists wear and deformation in busy workshops, helping maintain tight tolerances and extend tool life.
• Left-hand thread compatibility with simple readouts: Designed for left-hand thread applications, providing clear, easy-to-interpret results and reducing inspection errors.

Using this GO ring gauge speeds up inspections, reduces rework, and delivers reliable, repeatable measurements that support consistent thread quality across production runs. It gives you confidence that every threaded component meets the required standard and helps keep workflows efficient from intake through final QA.