The JBO Thread Ring Gauge (NoGo) – Metric Fine, Left Hand, 6g, M56 x 1.5 is a precision inspection tool designed to verify external metric threads quickly and reliably. It’s ideal for machinists, quality inspectors, and assembly teams who need to confirm that threaded components meet exact size and tolerance requirements. The gauge features a knurled outer edge for a secure grip and a small red mark to aid orientation during setup.

Built for everyday workshop use, the ring gauge is crafted from hardened steel to resist wear and maintain accuracy in demanding environments. Its left-hand, fine-thread configuration supports accurate checks on reverse-threaded parts, helping you identify non-conforming components at a glance and keep production moving smoothly.

• Metric Fine, Left-Hand NoGo design: Specifically tuned for M56 x 1.5 left-hand threads, it delivers fast, unambiguous go/no-go checks so you can determine part conformity with confidence and speed.
• Hardened steel construction: Durable, wear-resistant material stands up to daily use in busy shops, preserving measurement accuracy over time and reducing replacement costs.
• 6g tolerance for consistent results: Engineered to the 6g class, providing repeatable, reliable measurements across parts and batches to support standard-compliant quality checks.

Using this gauge simplifies threaded component inspection—from incoming parts to in-process checks and final assembly. It helps reduce rework, minimizes downtime, and delivers dependable performance that teams can rely on for accurate, repeatable results every shift.