The JBO Thread Plug Gauge is a precision internal-thread gauge designed to verify UNF holes with speed and accuracy. Built for engineers, inspectors, machinists, and maintenance teams across manufacturing, automotive, and aerospace, it ensures threaded holes meet the Unified Thread Standard. It features go/no-go ends and a rugged knurled body for fast checks in busy workshops.

• Go/No-Go end design: Quickly determine if the internal threads pass or fail by using the go end for a proper fit and the no-go end to confirm non-conformance, speeding up inspections and reducing rework.
• UNF right-hand size, No. 12 x 28, 2B tolerance: Precisely sized to the Unified Thread Standard for reliable suitability with common fasteners and threaded components, delivering consistent results across batches.
• Durable two-ended construction with color-coded ends: Built for daily workshop use with a robust, easy-to-grip body and clearly identifiable ends, helping your team orient readings quickly and reduce reading mistakes.

Using this gauge accelerates quality control by delivering clear pass/fail decisions for internal threads, helping ensure proper fit and function of threaded parts. The exact 2B tolerance on a right-hand No. 12 x 28 UNF thread provides dependable, repeatable readings across production runs, reducing scrap and rework. With its durable construction and intuitive Go/No-Go operation, you can trust it to perform in demanding environments and keep your workflow moving smoothly.