The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. This left-hand, M27 x 1 Go/No-Go gauge enables quick, reliable checks of threaded holes to ensure components fit together correctly.

Durable and easy to use, with a knurled body for secure handling, its hardened steel construction stands up to regular use in busy workshops.

• Go/No-Go Quick Checks: A two-ended design lets you quickly verify both the minimum and maximum permissible engagement. The Go end confirms the hole accepts the thread, while the No-Go end ensures it does not exceed the upper limit, speeding up QC and reducing guesswork.
• M27 x 1 Left-Hand Fine Thread (6H): Specifically calibrated for metric fine threading in this size and orientation, providing reliable, repeatable results that match your part specs and tolerance class.
• Hardened Steel with Knurled Grip: Built to endure busy shop environments, with wear-resistant steel and a textured grip that stays secure during measurement and reduces slippage.

Using this gauge helps you confirm thread quality fast, cut down rework, and maintain consistent assembly performance across batches, giving you confidence in every fit.