The JBO Thread Plug Gauge is a precision tool designed to verify metric fine threads in internal holes. It’s ideal for machining shops, manufacturers, maintenance teams, and hobbyists who need fast, reliable thread checks that don’t slow down production.

With a Go/No-Go design, a right-hand orientation, and a hardened steel body, this gauge delivers repeatable, accurate comparisons for M14 x 0.5 threads in the 4H tolerance class, ensuring components fit together with confidence.

• Go/No-Go Quick Verification: Quickly confirm whether the hole accepts the mating thread; speeds up inspections and reduces guesswork in assembly.
• Metric Fine Thread Fit: M14 x 0.5, 4H: Precisely checks the critical M14 x 0.5 hole size to ensure consistent, reliable engagement with fasteners.
• Hardened Steel, Durable Construction: Built to withstand daily use in busy shops, resisting wear and maintaining accuracy over time.

Using this gauge shortens inspection cycles, improves first-pass assembly success, and minimizes costly rework. The Go and No-Go ends provide clear, decisive results, so your team can move from measurement to production with confidence. Whether you're setting up a new production line, performing routine maintenance, or validating repaired threads, this gauge helps you lock in precise tolerances and deliver consistent results.