The JBO Thread Plug Gauge is a metric fine Go/No-Go gauge designed to verify threaded holes quickly and accurately. It is tailored for fine-thread applications, specifically M23 x 1 with a 4H tolerance, and is ideal for machine shops, manufacturers, and assembly work where precision matters.

Built with hardened steel and a knurled body, this gauge delivers durable, long-lasting performance under frequent use, while its Right Hand orientation supports standard mating holes in most assemblies.

• Go/No-Go quick inspection: Quickly confirm whether a hole meets the M23 x 1 4H thread specification, reducing guesswork and speeding quality checks.
• Metric fine thread compatibility: Precisely engineered for metric fine threads (M23 x 1) with a 4H tolerance, delivering repeatable gauging results across parts.
• Rugged construction with knurled grip: Crafted from hardened steel for wear resistance, with a textured knurl for a secure grip and accurate handling in busy workshops.

With the JBO Thread Plug Gauge, you gain faster thread verification, fewer reworks due to mismatched threads, and consistent hole sizing across batches. The durable design stands up to daily use in production environments, helping you streamline quality control and keep projects on schedule.