The JBO Thread Ring Gauge (GO) is a precision tool designed to quickly and reliably confirm external thread diameters on fasteners, fittings, and machined components. It’s ideal for engineers, inspectors, machinists, buyers, and workshops that require consistent, standards-compliant measurements to keep production—and assembly—moving smoothly.

• Precise GO sizing for reliable thread verification: Quickly confirm that external threads meet the metric fine standard (M50 x 2, right-hand, 6h) with clear go/no-go results, reducing guesswork and rework in QC and assembly.
• Durable hardened steel construction: Built to withstand daily use in demanding environments while maintaining dimensional stability and long service life.
• User-friendly design for fast, consistent checks: Knurled exterior for secure handling and a smooth internal thread that makes reading and performing checks quick and straightforward.

Using this gauge helps you speed up inspections, ensure parts fit correctly the first time, and minimize downtime. Its rugged build and precise Go gauge capability support reliable quality control across manufacturing, maintenance, and repair workflows, giving teams confidence in every measurement and every fit.