The JBO Thread Plug Gauge is a UNF Go-No/Go gauge designed for precise inspection of internal threads. Sized No. 1 x 72 with 3B tolerance and right-hand threading, it helps engineers, machinists, inspectors, and quality teams quickly verify threaded holes against Unified thread standards in manufacturing, automotive, and aerospace environments.

Its Go/No-Go design gives immediate pass/fail feedback—you can confirm proper engagement or flag non-conforming holes in moments, reducing downtime and rework while ensuring reliable fit and function in critical assemblies.

• Go/No-Go quick checks: Delivers fast, decisive validation of thread quality, so inspectors can separate good from out-of-tolerance holes with a single insertion.
• UNF right-hand, 3B, No. 1 x 72 calibration: Engineered to the UNF standard with a 3B tolerance, providing repeatable and consistent results across production runs.
• Durable, two-ended, easy-to-handle construction: Two ends support go and no-go checks in one tool, while a knurled body gives a secure, comfortable grip for repeated use.

The JBO Thread Plug Gauge helps you streamline quality control, shorten inspection times, and maintain reliable thread integrity across parts and assemblies. By providing clear go/no-go results for right-hand UNF threads, it supports accurate pass/fail decisions and contributes to higher overall product quality in your workflow.