The JBO Thread Plug Gauge is a precision go/no-go gauge for internal threads, designed for quick, reliable inspection of holes sized to left-hand UNC. With a 5/8 x 11 UNC specification and 2B tolerance, this gauge helps ensure every threaded hole meets exact Unified standards across manufacturing, automotive, and aerospace environments.

• Go/No-Go design accelerates checks: The Go end verifies compliant threads, while the No-Go end flags nonconforming holes, delivering clear pass/fail decisions in seconds for faster quality control.
• Left-hand 5/8-11 UNC, 2B tolerance: Precisely matched to standard LH internal threads, helping you avoid guesswork and deliver consistent, repeatable measurements across parts and assemblies.
• Durable, ergonomic construction: Solid metal body with a knurled grip and corrosion-resistant finish for reliable handling in busy workshops, reducing slippage and improving reading accuracy.

Using the JBO Thread Plug Gauge simplifies inspection workflows, reduces downtime from misaligned threads, and supports dependable results in production and repair environments. Its straightforward go/no-go action and robust design make it a trusted addition to any quality assurance toolkit, helping you verify thread integrity quickly and confidently from first part to last.