The JBO Thread Ring Gauge (NoGo) is a precision inspection tool for quickly verifying the external thread diameter of metric fine threads. It’s designed for engineers, quality inspectors, machinists, and shop-floor teams to confirm parts meet the required NoGo limit and prevent undersized or out-of-spec fasteners from moving forward.

This Left Hand version covers M6 x 0.5 threads and is manufactured from hardened steel for durable, long-lasting performance in busy workshops. The knurled outer edge provides a secure grip for fast, repeatable placement and readings, even when worn with gloves.

• Precise NoGo verification for metric fine threads: Quickly determine whether an external thread falls within the acceptable NoGo limit, reducing guesswork and speeding up quality checks.
• Left-hand, M6 x 0.5 (6g) calibration: Specifically tuned for left-hand fasteners, ensuring accurate inspection across common small-thread applications.
• Hardened steel with knurled grip: Built to resist wear and provide a reliable, long service life in demanding environments while offering secure handling for repeatable checks.

With the JBO Thread Ring Gauge NoGo, you gain fast, dependable checks that fit seamlessly into standard QC workflows. It minimizes downtime by quickly flagging non-conforming parts, speeds up assembly readiness, and supports consistent thread quality across lots, vendors, and production lines.