The JBO Thread Ring Gauge (GO) – Metric Fine, Left Hand, 6g, M42 x 3 is a precision Go gauge designed to quickly and reliably verify external thread diameters. With its metric fine configuration and left-hand thread orientation, it helps ensure threaded components meet the exact size and fit requirements during setup, inspection, and quality control.

Crafted from hardened steel for lasting durability, this gauge stands up to the demands of busy workshops and production lines. Its precise M42 x 3 size, coupled with 6g tolerance, provides consistent results across parts and batches, helping reduce rework and keep workflows running smoothly.

• Exact M42 x 3 Left-Hand GO Size: Quickly verify external thread diameters for left-hand threads and determine if parts meet the GO limit with confidence.
• Hardened Steel Construction: Delivers exceptional wear resistance and durability in demanding workshop environments, minimizing replacement and downtime.
• Metric Fine, 6g Tolerance: Supports precise go/nogo decisions, ensuring consistent, repeatable checks across lots and shifts.

This gauge helps streamline quality control, speed up setup, and improve measurement reliability. By providing a clear pass/fail indication for external threads, it reduces inspection time, lowers the risk of mismatches, and supports tighter process control across manufacturing, assembly, and maintenance tasks.