The JBO Thread Plug Gauge (GO) – Metric Fine is a precision inspection tool designed to quickly verify that threaded holes meet the required size. This GO gauge is sized for M65 x 4 with a metric fine pitch, 6H tolerance, and right-hand threading—making it ideal for engineers, machinists, inspectors, and maintenance teams who rely on fast, accurate hole checks.

Crafted from hardened steel for lasting performance, the GO gauge resists wear in busy production environments and maintains accuracy through repeated use. Its simple, intuitive design lets you identify a properly threaded hole at a glance, helping you streamline quality control and reduce rework.

• Accurate GO gauge for metric fine threads (M65 x 4, 6H): Quickly confirms hole acceptance for reliable go/no-go decisions, reducing guesswork and ensuring consistent thread quality across parts.
• Hardened steel construction for durability: Built to endure daily use in demanding shops, resisting wear and preserving precise dimensions over time for long service life.
• Easy to use in standard QC workflows: Designed for fast, straightforward go/no-go checks that fit neatly into existing inspection routines and data-tracking processes.

Using the JBO GO Thread Plug Gauge helps you maintain consistent thread quality, speed up inspections, and minimize downtime. It delivers repeatable, dependable results that support reliable assembly, maintenance, and quality control across projects.