The JBO Thread Plug Gauge is a precision tool designed to verify metric fine-thread holes with confidence. Built for M12 x 0.75 threads and Right Hand operation in 4H tolerance, it’s ideal for engineers, machinists, and assembly specialists who depend on accurate hole sizing. The Go/No-Go design lets you perform fast, definitive checks of threaded holes—ensuring parts assemble correctly the first time.

Crafted for durability, this plug gauge uses hardened steel for wear resistance in busy shop environments. The dual-ended design makes inspection straightforward in tight spaces, and a knurled body provides a secure grip for precise alignment during testing.

• Go/No-Go Quick Checks: Quickly determine if the hole falls within tolerance, speeding up setups and reducing guesswork.
• Metric Fine Thread Compatibility (M12 x 0.75): Precisely tests against standard fine-pitch threads to ensure accurate, repeatable results.
• Hardened Steel Construction with Knurled Grip: Durable, long-lasting performance with a secure, slip-free grip for comfortable handling.

Using this gauge helps streamline quality checks, cut downtime, and provide reliable assurances that threaded connections will thread smoothly and meet specification in production or field work.