The JBO Thread Plug Gauge (GO) – Metric Fine, Left-Hand, M45 x 1 is a precision go/no-go inspection tool designed to verify threaded holes. It helps engineers, machinists, inspectors, and quality teams quickly confirm that holes match the M45 x 1 left-hand thread size and pitch to meet exact specifications.

• Left-Hand, Metric Fine GO design: Specifically sized to M45 x 1 left-hand threads, enabling fast, reliable GO checks to confirm a hole meets the required size and pitch.
• Hardened steel construction: Built to resist wear and deliver long-lasting accuracy in busy shop environments.
• Easy, quick verification: Smooth insertion and a clear acceptance indication, helping operators speed up inspections and reduce rework.

With its precise sizing and durable construction, this gauge streamlines your inspection workflow—providing quick, confident pass/fail decisions, minimizing rework, and helping you maintain consistent quality across every part.