The JBO Thread Ring Gauge (GO) — Metric Fine — Right Hand — 6h — M4 x 0.5 is a precision tool designed to quickly confirm external thread sizes. It is ideal for engineers, machinists, quality inspectors, and workshop technicians who need a fast, reliable go/no-go check for M4 x 0.5 threads.

Made from hardened steel for durability, this gauge resists wear in busy environments and keeps readings accurate over many uses. Its simple, intuitive design makes it easy to identify when a threaded component conforms to specification, supporting efficient quality control and consistent results.

• Fast go/no-go checks for quick acceptance: Quickly verify external M4 x 0.5 threads against the GO dimension to confirm parts meet tolerance, reducing inspection time and accelerating throughput.
• Durable hardened steel construction: Built to last in busy workshops, resisting wear and maintaining precise measurements after countless uses.
• Metric fine thread compatibility (M4 x 0.5, right-hand, 6h): Precisely matched to metric fine threads, ensuring repeatable, trustworthy measurements and easy QA workflow.

The JBO GO gauge empowers you to maintain tight tolerances with confidence. It enhances workflow by delivering quick, decisive measurements, reducing rework, and supporting consistent results across production runs—so you can assemble with certainty and deliver reliable parts every time.