The JBO Thread Plug Gauge (GO) in metric fine is a precision inspection tool designed to quickly verify internal threads in drilled or tapped holes. It is ideal for engineers, machinists, quality inspectors, and maintenance teams who need a reliable go/no-go check to confirm a hole meets the exact size and tolerance for M55 x 4 threads with a 6H fit.

Crafted from hardened steel for long wear, this GO gauge features a knurled, easy-grip body and a right-hand thread orientation that aligns with common internal-thread applications. Its exact dimensions provide consistent, repeatable checks that streamline QC workflows and support precise threaded assemblies.

• Precise metric GO gauge for M55 x 4, 6H: Quickly verify that internal threads conform to the specified size and tolerance, enabling fast pass/fail decisions during quality control.
• Durable hardened steel with knurled grip: Built to withstand daily use in busy environments, delivering long tool life and reliable handling even with oily or dusty hands.
• Right-hand orientation for standard internal threads: Aligns with common machining practices, reducing setup time and ensuring consistent measurements across your production line.

Using this GO gauge helps reduce inspection time, minimize rework, and improve reliability in threaded assemblies. It delivers clear, repeatable results that support standardized QC workflows and empower teams to maintain tight tolerances with confidence.