The JBO Thread Plug Gauge - UNC Go-No/Go, Right Hand, 3B, No. 12 x 24 is a precision inspection tool designed to quickly verify the internal UNC threads in holes and bores. It’s built for engineers, machinists, quality inspectors, and maintenance technicians who need reliable, repeatable checks to ensure threads meet Unified standards.

With a straightforward go/no-go design and a right-hand UNC configuration, this gauge delivers fast, unambiguous feedback during assembly, quality control, and routine maintenance. The 3B tolerance class supports consistent measurements across jobs and operators, making it a dependable staple in any inspection toolkit.

• Go/No-Go design for rapid acceptance testing: Provides clear pass/fail guidance, reducing inspection time and preventing misfits in assemblies.
• Right-hand UNC, No. 12 x 24 size: Precisely matched to common UNC thread specifications for accurate checks on frequently used fittings and components.
• 3B tolerance class for consistent results: Ensures repeatable, reliable thread verification across multiple tools and operators, enhancing overall quality control.

This gauge helps streamline your inspection workflow, minimizes guesswork, and improves the reliability of threaded assemblies. By delivering quick, confident results, it supports faster production cycles, reduces downtime, and elevates measurement consistency across shifts and teams.