The JBO Thread Ring Gauge (GO) is a precision inspection tool designed to quickly verify external threads meet exact specifications. Specifically calibrated for metric fine threads, it checks M40 x 1 left-hand threads with a 6g tolerance to confirm proper fit and conformance. It’s ideal for machinists, quality control inspectors, and manufacturing engineers who need fast, reliable go/no-go checks to keep parts within spec.

Built for demanding workshops, this ring gauge is crafted from hardened steel for exceptional wear resistance and long service life. Its user-friendly design makes it easy to identify correctly formed threads at a glance, supporting consistent quality control and precise engineering workflows.

• Precise GO check for metric fine M40 x 1 left-hand threads: Calibrated to 6g tolerance to deliver fast, clear go/no-go results, helping you quickly accept or reject parts and maintain uniform quality across batches.
• Hardened steel construction for durability: Withstand daily handling and repeated mating with threads, delivering reliable performance and long service life in busy shop floors.
• Ergonomic, user-friendly design: Knurled outer edge and intuitive alignment support quick, confident readings and easy identification of compliant components.

The JBO Thread Ring Gauge GO Metric Fine helps you streamline inspection, reduce downtime, and improve consistency in thread quality. By providing clear pass/fail indications and robust durability, it supports efficient workflows for engineers, buyers, and technicians alike—giving you confidence that every M40 x 1 left-hand thread has been measured correctly.