The JBO Thread Plug Gauge (GO) is a precision inspection tool designed to verify metric fine-threaded holes. It’s ideal for engineers, buyers, machinists, quality inspectors, and hobbyists who need fast, reliable checks to ensure internal threads conform to required size and pitch.

Crafted from hardened steel for durability, this left-hand GO gauge features a 6H tolerance and a precise M55 x 2 thread size. The knurled body provides a secure, non-slip grip for easy insertion and removal in busy work environments, while its clear design helps quickly identify holes that are properly threaded, supporting consistent quality control across jobs.

• Metric Fine GO gauge (M55 x 2): Precisely verifies internal threads to metric fine standards, enabling quick pass/fail decisions and consistent inspection results.
• Hardened steel construction: Withstands wear and maintains accuracy through heavy use, delivering long service life in demanding shop settings.
• Left-Hand, 6H tolerance: Designed for left-hand threaded holes with a standardized tolerance, ensuring reliable, repeatable checks and reducing rework.

Using the JBO Thread Plug Gauge (GO) streamlines quality control by providing a clear, decisive indication when holes are correctly threaded. Its robust build minimizes downtime due to wear, while the precise size and pitch support accurate fit verification, helping parts meet spec the first time and boosting confidence in your manufacturing process.