The JBO Thread Plug Gauge is a precision internal-thread gauge designed for UNF (Unified Fine) thread inspection. It’s an essential tool for machinists, inspectors, and maintenance professionals who need fast, reliable verification of threaded holes in manufacturing, automotive, and aerospace settings.

This gauge features a right-hand, 2B class Go/No-Go configuration in the No. 5 x 44 size. Use the go end to confirm a hole accepts a correctly sized plug and the no-go end to verify non-conformance, enabling quick, confident acceptance decisions and minimizing the risk of misfits.

• Go/No-Go quick verification: Enables rapid pass/fail decisions for each hole, speeding inspections and helping you sort in‑spec parts from those needing rework.
• UNF Right-Hand 2B No. 5 x 44 specification: Precisely matched to standard UNF internal threads, ensuring readings align with common hole sizes and reducing guesswork during setup.
• Rugged, user-friendly design: Knurled grip and robust ends provide secure handling, easy insertion into tight holes, and repeatable measurements in busy workshop environments.

In daily use, the JBO Thread Plug Gauge helps you improve workflow by delivering clear, quick confirmation of thread quality, cutting inspection time, and supporting consistent results across parts and operators. It helps prevent misfits in assemblies, reduces downtime from rework, and strengthens overall quality control when checking internal threads to standard specifications.