The JBO Thread Ring Gauge (NoGo) is a precision tool designed to verify external M12 x 1.25 threads. Built for manufacturers, machinists, QA professionals, and workshop technicians, this metric fine gauge delivers quick, reliable checks to confirm parts meet specification. The NoGo style helps you identify out-of-tolerance components at a glance, supporting consistent quality in assembly and maintenance tasks.

• Precise Go/NoGo verification for M12 x 1.25: Quickly determine whether external threads are within tolerance; the NoGo portion clearly flags oversize parts, helping you reject non-conforming components right on the spot.
• Hardened steel construction for long life: Designed to resist wear in busy shops and production lines, preserving dimensional accuracy over thousands of insertions and inspections.
• User-friendly design for fast identification: Right-hand orientation with clear markings and smooth seating makes it easy to use, clean, and integrate into daily QC routines.

The JBO NoGo ring gauge helps you streamline inspections, reduce rework, and improve traceability across your manufacturing or maintenance workflows. By delivering consistent, repeatable results, it supports faster decision-making, lowers downtime, and strengthens quality control—so you can ship parts with confidence and keep assemblies reliable.