JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M39 x 1 M&D Flutes: 4-flute design for stable

Flutes: 4-flute design for stable rigidity and efficient chip evacuation

The straight shank provides straightforward handling and compatibility with standard reaming handles

built in HSS for intermediate-precision hole finishing

repeatable features in mold and die work

A W coating enhances wear resistance and machining stability

JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M39 x 1 M&D Flutes: 4-flute design for stableThe JBO Thread Ring Gauge (GO) Metric Fine, Right Hand, M39 x 1 is a precision inspection tool designed to verify external thread diameters on fasteners, fittings, and machined components. Its ideal for engineers, inspectors, machinists, and quality teams who need fast, reliable checks to confirm threads conform to exact standards. Specifically tuned for metric fine threads, including M39 x 1 right hand configurations, this GO gauge provides a quick