The JBO Thread Plug Gauge is a dedicated inspection tool designed for left-hand UNC threads. It helps you quickly verify threaded holes and plugs against Unified Thread Standards, ensuring proper fit and function across manufacturing, automotive, and aerospace applications.

With a go/no-go design and a durable dual-ended body, this gauge delivers fast, reliable checks in busy work environments—providing clear pass/fail results for 1-1/2 x 6 threads with a 2B tolerance.

• Go/No-Go verification: Quickly identify conforming versus non-conforming threads with a simple pass/fail check, reducing inspection time and guesswork.
• Left-Hand UNC compatibility: Precisely sized for left-hand thread applications to ensure accurate gauging and proper fitment of components.
• 2B tolerance class: Maintains tight, repeatable measurements for consistent quality across production runs, helping minimize rework and rejects.

This gauge helps streamline quality control, shorten inspection cycles, and protect critical assemblies by confirming thread accuracy before assembly. Its straightforward Go/No-Go checks reduce downtime, improve workflow efficiency, and support reliable performance of left-hand UNC threaded parts across your operation.