The JBO Thread Plug Gauge (NoGo) is a precision inspection tool designed to verify metric coarse internal threads. Sized for M42 x 4.5 with a 6H tolerance and a right-hand thread, it helps technicians quickly confirm that threaded holes meet the required fit. Ideal for machine shops, quality labs, and maintenance teams, this NoGo gauge clearly indicates holes that exceed tolerance so you can address them efficiently.

Constructed from hardened steel for lasting durability, the gauge resists wear and maintains accurate boundary checks even after repeated use in busy environments. Its knurled body provides a secure, comfortable grip, enabling fast, confident inspections without the need for extra tools.

• Fast, reliable Go/NoGo verification: Delivers decisive boundary checks to quickly separate compliant holes from out-of-spec ones, reducing inspection time and downtime.
• Hardened steel durability: Built to withstand daily use in demanding workplaces while preserving measurement accuracy over time.
• Metric coarse sizing for reliability: Engineered for M42 x 4.5 with 6H tolerance and a right-hand thread, ensuring consistent results across standard components.

Using the JBO Thread Plug Gauge (NoGo) helps you validate threaded holes with confidence, improving workflow and accuracy across production, assembly, and maintenance tasks. The combination of durable construction and precise sizing supports repeatable results, reduces rework, and helps your team meet stringent specifications with each inspection.