The JBO Thread Plug Gauge is a precision tool designed to quickly and reliably verify internal UNF threads in holes. It’s ideal for manufacturing environments, automotive assembly, aerospace components, and workshop QA teams that require fast, confident pass/fail checks to Unified thread standards. With its Go/No-Go design, inspectors can determine whether a hole is within tolerance at a glance, helping to prevent misfits and rework.

• Go/No-Go quick conformance check: Instantly confirms whether the LH UNF threads in a hole meet the required Go and No-Go limits, speeding up inspections and reducing downtime.
• Left-hand thread compatibility: Specifically engineered for left-hand threads, ensuring accurate measurements and reliable results for LH fasteners and components.
• 2B tolerance class and No. 12 x 28 size: Precisely aligned with Unified thread standards to deliver consistent hole verification across parts and production runs.

Using the JBO Thread Plug Gauge helps streamline quality control, improve first-pass assembly confidence, and maintain consistent results across production. Its durable construction and clear, tactile design provide dependable performance on busy shop floors, so teams can trust that threaded holes meet spec before assembly or installation.