The JBO Thread Plug Gauge is a Go/No-Go tool designed for quick, reliable checks of metric coarse threads. This Left Hand model supports precise inspection for holes sized M1.4 x 0.3 with a 5H class, helping inspectors and machinists verify that threaded holes meet the intended fit and function.

Built to endure demanding shop conditions, the gauge is manufactured from hardened steel to resist wear and maintain accuracy through heavy use. Its simple, durable design supports fast, repeatable inspections on the production floor or in the workshop.

• Go/No-Go Validation at a Glance: Quickly confirm hole acceptance by checking that the go limit fits while the no-go limit does not, reducing inspection time and removing guesswork.
• Hardened Steel Durability: Withstand busy, abrasive environments and maintain measurement accuracy over many cycles, delivering long service life.
• Metric Coarse Thread Compatibility: Specifically tuned for coarse metric threads like M1.4 x 0.3, ensuring reliable, repeatable checks across parts and suppliers.

Using this gauge on your parts workflow helps ensure components assemble cleanly, reduces rework, and supports consistent quality across batches. Whether you’re in manufacturing, maintenance, or prototyping, this tool provides a dependable, straightforward check you can trust at a glance.