The JBO Thread Plug Gauge is a precision tool that quickly verifies UNF threaded holes. Its go/no-go design lets technicians determine at a glance whether a hole conforms to the Unified thread standard, helping ensure proper fit and reliable performance in assemblies.

This left-hand gauge is sized No. 2 x 64 and specified as 2B, making it ideal for shops and production lines that routinely inspect left-hand UNF threads. Its compact, hand-friendly form supports fast, repeatable checks without special tools or setup.

• Go/No-Go quick checks: Quickly determine hole conformity by attempting to thread the gauge in; "Go" means the hole accepts the gauge, "No-Go" indicates nonconforming size, enabling fast pass/fail decisions and reduced inspection time.
• Left-hand UNF compatibility: Specifically designed for left-handed threads, ensuring you measure the correct holes and avoid mix-ups in assemblies and repairs.
• Ergonomic, durable construction: Knurled grip and precision-machined ends provide secure handling, repeatable readings, and reliable use in busy shop environments.

By delivering clear, repeatable results with minimal effort, the JBO Thread Plug Gauge helps streamline quality checks, shorten setup and inspection times, and improve overall assembly accuracy. Using this gauge reduces guesswork, minimizes rework, and gives teams confidence that threaded components will fit and function as intended.