The JBO Thread Plug Gauge - UNF Go-No/Go - Left Hand - 2B - No. 3 x 56 is a precision inspection tool designed to quickly verify internal UNF threads. Its straightforward Go/No-Go design provides an immediate pass/fail reading for threaded holes, helping you confirm conformance and keep production running smoothly in manufacturing, automotive, and aerospace settings.

• Go/No-Go quick verification: Enables fast, objective checks of threaded holes, reducing inspection time and eliminating guesswork so crews can move swiftly from setup to production.
• Left-hand UNF compatibility: Specifically engineered for left-handed threads with 2B tolerance, delivering reliable readings that reflect real-world assembly conditions and prevent misfits.
• Durable, precision-machined construction: Built for rugged shop use with a knurled, easy-grip body and precisely finished ends to maintain accuracy and withstand repeated use.

Designed to integrate seamlessly into your quality control workflow, this gauge helps you identify non-conforming holes before they become a production hold-up. Its clear go/no-go indications support consistent inspections, reduce rework, and build confidence in every threaded Fastener-to-hole engagement, from routine maintenance to high-stakes aerospace applications.