The JBO Thread Ring Gauge (NoGo) – UNEF – Left Hand – 2A – 15/16 x 20 is a precision inspection tool designed to verify external thread diameters to Unified thread standards. It’s ideal for manufacturers, automotive, aerospace, and maintenance teams that need quick, reliable checks during quality control and assembly. The NoGo design helps you quickly identify non-conforming threads, reducing guesswork and rework.

Crafted from hardened steel, this ring gauge is built to endure daily use in busy workshops and inspection labs while preserving measurement accuracy. The left-hand UNEF 2A 15/16 x 20 sizing ensures you’re testing against the correct standard, providing consistent, repeatable results across parts and assemblies.

• Go/No-Go quick verification: Quickly confirms whether external threads meet the UNEF 2A 15/16 x 20 spec, helping prevent mismatches and costly rework.
• Durable hardened steel construction: Designed for daily shop wear, resisting wear and maintaining accuracy over time for long tool life.
• Left-hand UNEF 2A 15/16 x 20 sizing: Precisely tuned for the specified thread direction and size to deliver reliable, repeatable measurements every time.

Used effectively, this gauge accelerates quality control workflows, ensuring only compliant parts proceed to assembly and downstream processes. Its reliable performance supports tighter tolerances, faster inspections, and greater confidence in fitment and reliability across your products.