The JBO Thread Plug Gauge (NoGo) - Metric Fine is a precision inspection tool designed to verify metric fine threaded holes with reliability. It is ideal for machinists, quality inspectors, engineers, and maintenance teams who need fast, repeatable checks to confirm hole sizes meet specification.

Designed for right-hand metric fine threads (M55 x 3) with a 6H tolerance, the gauge provides a clear no-go indication when a hole is out of spec. Crafted from hardened steel for durability, it resists wear in demanding shop environments, and the knurled exterior offers a secure grip for quick, repeatable measurements.

• Metric Fine NoGo verification for M55 x 3, 6H (Right-hand): Provides fast, unambiguous checks to confirm threaded holes meet the 6H tolerance, helping prevent undersized holes from passing inspection.
• Durable hardened-steel construction: Built to withstand daily use in busy workshops, delivering long-lasting dimensional stability and reliable performance over time.
• Ergonomic knurled grip: Secure handling and precise alignment during measurements, even when wearing gloves, for consistent results across checks.

Using the JBO NoGo gauge for metric fine threads helps streamline quality control, reduce rework, and support consistent results across parts and shifts. Its precise size, rugged construction, and comfortable handling make it a dependable tool for handheld thread inspection in metalworking, manufacturing, and maintenance environments.