The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Specifically tuned for M39 x 0.5, this right-hand Go/No-Go gauge is ideal for engineers, machinists, and quality inspectors who need fast, confident checks of threaded holes.

Built for daily workshop use, it features a rugged knurled body and durable ends that stand up to regular handling. The Go/No-Go design lets you verify both the minimum and maximum thread limits at a glance, ensuring parts will assemble cleanly without guesswork. With 6H tolerance, this gauge aligns with standard metric fine-thread specs for reliable results right out of the box.

• Go/No-Go Dual-Ended Check: Quickly confirm that a hole accepts the Go limit and rejects the No-Go limit, speeding up quality control and reducing guesswork during assembly.
• Hardened Steel Construction: Built to withstand heavy use, resisting wear so accuracy is maintained across many inspections.
• Ergonomic Knurled Body with Right-Hand Design: Easy to grip, easy to align with standard right-handed threads, and simple to identify go vs no-go sides even in gloves.

Use this gauge to streamline your inspection process, minimize rework, and ensure every threaded hole meets exact M39 x 0.5 specifications. The combination of a precise Go/No-Go system, durable materials, and ergonomic handling supports consistent, reliable results from the first check to the last.