The JBO Thread Plug Gauge (GO) is a precision inspection tool designed to quickly verify UNC right-hand threaded holes and mating parts. It’s ideal for manufacturing, automotive, and aerospace quality control, providing fast, reliable go/no-go checks to confirm thread conformity.

Sized for practical shop use, this GO plug gauge measures 1 3/4 inches in diameter with a 5-inch overall length and is engineered to the Unified Thread Standard (UNC) with a 2B tolerance. The GO design delivers a clear pass indication when the thread is within spec, helping your team speed up inspections and reduce guesswork.

• Go Gauge Design for Quick Conformity Verification: Enables a fast, single-motion check of threaded holes—if the gauge threads in smoothly, the thread is within tolerance, speeding up inspections and approvals.
• Precise, Durable Construction: Ground to tight tolerances with a robust, wear-resistant finish to deliver repeatable measurements and long service life in busy environments.
• Standard UNC Right‑Hand, 2B Tolerance (1 3/4 x 5): Precisely matched to Unified thread specifications, providing consistent checks across parts and suppliers to minimize rework and ensure reliable assembly.

Using the JBO Thread Plug Gauge (GO) helps you streamline quality workflows, reduce inspection time, and improve the reliability of threaded assemblies. It provides a dependable reference that supports accurate part fitment, minimizes downtime, and reinforces confidence in every measurement you make.