The JBO Thread Ring Gauge (GO) - Metric Fine is a precision tool designed to verify external thread diameters to exact metric standards. It’s ideal for machinists, QC inspectors, and assembly teams who need fast, reliable Go checks during production. With its right-hand thread, 4h tolerance, and M39 x 1.5 specification, it provides a conclusive Pass/Fail measure for critical components.

• Precise GO verification for M39 x 1.5 metric fine: Quickly confirms the external thread diameter meets the standard, reducing guesswork and rework in QC and assembly.
• Hardened steel construction for durability: Built to withstand daily workshop use, resisting wear and maintaining accuracy over many cycles.
• Clear go/no-go inspection: Designed for straightforward checks that produce reliable, repeatable pass/fail results, speeding inspections and ensuring consistent quality across parts.

Using the JBO Thread Ring Gauge (GO) streamlines inspection workflows, helping you shorten setup times, cut downtime, and improve overall part fit and performance. Its durable build and precise GO sizing give you confidence that threaded components will mate correctly and stay within specification throughout production and in the final product.