JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M39 x 1 M&D straight bore is essential

straight bore is essential

repeatable features in mold and die work

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

The 2-flute geometry paired with a 30° helix delivers steady cutting action and a good balance between material removal and surface finish

built in HSS for intermediate-precision hole finishing

JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M39 x 1 M&D straight bore is essentialThe 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