The JBO Thread Ring Gauge (GO) – Metric Fine is a precision tool for verifying external threads on components. Built for M20 x 1.5 metric fine threads with a right-hand orientation and a 4H tolerance, it helps technicians, buyers, and engineers quickly determine if a threaded part meets specifications during inspection and assembly.

Made from hardened steel, this ring gauge delivers durability and wear resistance in busy workshop environments. The meticulous design yields consistent go measurements, enabling fast pass/fail decisions and less rework.

• Go/No-Go quick checks: Provides at-a-glance verification of whether a part’s external thread meets the M20 x 1.5 right-hand 4H specification, speeding inspections and reducing guesswork.
• Durable hardened steel construction: Built to withstand daily wear in demanding shops, delivering long-lasting accuracy and reliability over time.
• Metric Fine, right-hand compatibility: Precisely engineered for metric fine threads (M20 x 1.5, right-hand), ensuring consistent, repeatable results across parts and assemblies.

With the JBO Thread Ring Gauge (GO) – Metric Fine, you gain fast, confident thread verification that keeps production moving. Its durable construction stands up to daily use, while the clear go/no-go feedback shortens inspection time and reduces guesswork. By helping you verify that every M20 x 1.5 right-hand thread meets the 4H specification, it improves consistency across parts and assemblies, ultimately delivering better fit, fewer rejects, and smoother workflow.