The JBO Thread Plug Gauge is a precision go/no-go instrument designed to verify UNJF threads in holes. Specifically tailored for right-hand threads in the 5/8-18 size and 3B tolerance, it’s ideal for manufacturing, automotive, and aerospace environments. Used in quality control, it enables quick confirmation that a threaded hole conforms to UNJF standards and will assemble reliably.

• Go/No-Go quick identification: Instantly indicate whether a threaded hole meets the UNJF specification, speeding inspections and minimizing guesswork in daily QC checks.
• UNJF thread verification: Delivers precise, repeatable checks on thread form and size to ensure consistent fit and interchangeability across parts and assemblies.
• Rugged, user-friendly design: Durable construction with a knurled grip for secure handling and accurate readings even in busy shop environments, reducing user fatigue and reading errors.

With the JBO Thread Plug Gauge, you streamline quality control, shorten inspection cycles, and improve assembly reliability. Its clear Go/No-Go results support consistent performance across batches, helping you maintain tight tolerances and confidence in every threaded connection.