The JBO Thread Ring Gauge (NoGo) — Metric Fine, Right Hand, 4h, M20 x 1.5 — is a precision instrument for validating external thread diameters on fasteners and machined parts. Built for reliability in manufacturing, maintenance, and quality control, it provides fast, decisive go/no-go checks that keep production moving.

Made from hardened steel for durability, the NoGo gauge resists wear in busy workshops and maintains accurate measurements over time. Its user-friendly design makes it easy for both seasoned technicians and occasional operators to identify non-conforming threads quickly and confidently.

• Clear NoGo verification: Quickly confirms whether a part’s external thread exceeds the maximum size, enabling fast pass/fail decisions and reducing inspection time.
• Metric Fine thread compatibility: Precisely sized for M20 x 1.5 right-hand threads with 4h tolerance, ensuring accurate checks against common metric components and standards.
• Durable hardened steel construction: Built to withstand daily use in demanding environments, with a knurled edge for secure handling and long service life.

By incorporating this gauge into your quality control workflow, you can speed up threaded-part inspections, improve consistency across batches, and reduce the risk of mis-sized components. The JBO NoGo Ring Gauge provides repeatable, reliable results for metric fine threads, helping you meet engineering specs and keep production on track.