The JBO Thread Plug Gauge is a precision inspection tool built to verify internal UNJF threads in right-hand holes. Sized No. 8 x 36 and rated 3B, this Go-No/Go gauge helps you confirm that threaded holes meet UNJF standards during critical quality checks across manufacturing, automotive, and aerospace applications.

Designed for engineers, shop floor technicians, and quality teams, this gauge provides a fast, reliable way to assess thread conformity. The Go/No-Go design lets you quickly distinguish conforming from non-conforming threads, reducing guesswork and speeding up inspections without sacrificing accuracy.

• Go/No-Go design for quick acceptance testing: Instantly determines whether the No. 8 UNJF hole meets the required size, enabling fast, decisive quality decisions and reducing inspection time on the line.
• UNJF 3B tolerance alignment for reliable results: Precisely matched to UNJF Go-No/Go standards with a 3B tolerance class, ensuring consistent measurements across parts and batches.
• Durable, ergonomic design with color-coded ends: Rugged metal body with a knurled grip and color-coded end sections for easy orientation, secure handling, and reduced setup errors in busy environments.

By delivering dependable Go-No/Go indications for No. 8 x 36 internal threads, the JBO Thread Plug Gauge helps streamline your inspection workflow, minimize rework, and maintain consistent thread quality across production runs in manufacturing, automotive, and aerospace settings.