The JBO Thread Ring Gauge (NoGo) is a precision tool for validating external UNF threads. Designed for technicians, inspectors, and machinists, it helps ensure threaded parts meet exact dimensions before assembly or shipment.

Specifically engineered for UNF left-hand threads in the 7/8 x 14 size with a 2A tolerance class, this NoGo gauge provides a clear, fast indication when a thread is out of spec, supporting reliable fitment and quality control across manufacturing environments.

• No-Go verification for quick, definitive checks: The no-go section lets you instantly identify non-conforming threads, speeding up inspections and reducing the risk of mismatched parts.
• UNF Left-Hand 7/8 x 14, 2A accuracy: Precisely manufactured to the Unified thread standard with a class 2A fit, ensuring consistent measurements and repeatable results across parts and batches.
• Hardened steel construction for durability: Built to withstand daily use in demanding shop environments, maintaining tolerance integrity and long service life.

Used across manufacturing, automotive, and aerospace applications, this gauge helps you measure external thread diameters reliably, streamline your inspection workflow, and maintain high-quality assemblies with confidence.