JBO Thread Plug Gauge is a precision tool designed for metric fine threads. It provides fast, reliable go/no-go checks to verify internal threads in holes, helping engineers, machinists, inspectors, and hobbyists confirm proper fit before assembly.

Built for right-handed threads and the M1 x 0.2 specification, this gauge features a hardened steel body for lasting use in busy workshop environments.

• Go/No-Go quick checks: Quickly confirm whether the hole's thread engagement meets the spec, reducing inspection time and preventing misfits in assemblies.
• Metric fine thread compatibility: Specifically engineered for metric fine threads, including M1 x 0.2, providing accurate go/no-go results for precision components.
• Durable, user-friendly construction: Hardened steel body stands up to daily workshop use, with a knurled grip for secure handling and long service life.

With the JBO Thread Plug Gauge, you can speed up quality checks, reduce rework, and ensure consistent thread quality across parts. The go/no-go design delivers clear, actionable results, while the hardened steel construction ensures reliable performance even in demanding shop environments. By validating your metric fine-thread holes (including M1 x 0.2) at the source, you improve workflow efficiency and confidence in every assembly.