The JBO Thread Ring Gauge (NoGo) – UNC – Right Hand – 3A – No. 1 x 64 is a precision inspection tool for external threads. Sized to Unified Thread Standards, it helps engineers, inspectors, machinists, and fabricators quickly verify that fasteners and threaded components meet the correct diameter and fit. The NoGo design provides an immediate go/no-go indication for non-conforming threads, supporting reliable quality checks on parts moving through manufacturing, automotive, and aerospace workflows.
Crafted from hardened steel, the gauge resists wear on busy shop floors and maintains accurate reference dimensions for long service life.

• NoGo Quick-Check for Out-of-Tolerance Threads: The dedicated NoGo face lets you quickly identify threads that fail to meet tolerance, speeding inspections and reducing rework.
• UNC Right-Hand, 3A Standard Compatibility: Precisely matched to Unified Thread Standard, ensuring reliable checks on common fasteners and components with consistent results across parts.
• No. 1 x 64 Size: Specifically sized to No. 1 x 64, enabling accurate measurements for this common UNC thread range and simplifying part qualification.

Used in incoming and in-process inspection, this gauge helps you speed up checks, avoid misfits, and maintain tight tolerances across batches. Reliable, durable, and aligned to standard UNC threads, it supports consistent results and confidence in every qualification.