The JBO Thread Ring Gauge (NoGo) is a precision tool designed to quickly verify external thread diameters on metric coarse threads. Specifically configured for M20 x 2.5 left-hand threads and a 6g tolerance, this NoGo gauge helps inspectors and machinists confirm that components meet the required standards without guesswork.

Built for reliability in quality control, manufacturing, and workshop environments, it lets you identify non-conforming parts at a glance and keeps your production lines moving.

• NoGo Quick-Check for External Threads: Instantly confirms whether an M20 x 2.5 left-hand thread meets the NoGo limit, speeding inspections and reducing guesswork.
• Hardened Steel Construction: Designed to resist wear in busy workshops, maintaining accuracy after repeated use and delivering long service life.
• Metric Coarse Left-Hand Compatibility: Precisely machined for the M20 x 2.5 left-hand coarse thread standard, ensuring reliable, repeatable checks across parts and assemblies.

With the JBO NoGo Ring Gauge, you gain fast, confident checks that keep quality control consistent. Its durability means fewer recalibrations and less downtime, while its precise compatibility with metric coarse, left-hand threads reduces inspection errors and improves overall fitment reliability across your production line.