The JBO Thread Plug Gauge is a precision inspection tool designed to verify UNF (Unified Fine) threaded holes with a clear go/no-go signal. It is ideal for manufacturers, automotive shops, aerospace QC labs, and maintenance technicians who need fast, repeatable checks to ensure holes meet the required UNF standard and will properly accept the mating fastener. The left-hand configuration targets reverse-threaded components, ensuring you inspect the correct thread direction every time.

Built for daily use, this gauge features a durable, knurled handle and robust metal construction. Its go/no-go design lets inspectors quickly confirm conformance without guesswork, while the No. 1 x 72 size and 2B tolerance deliver reliable, repeatable measurements across parts and production runs.

• Go/No-Go quick validation: A simple pass/fail check for UNF threads, saving inspection time and reducing guesswork by clearly showing whether the hole accepts the intended fastener.
• UNF left-hand compatibility and precise sizing: Engineered to UNF standards with left-hand thread support, using a precise No. 1 x 72 measurement and 2B tolerance for consistent results.
• Durable, comfortable handling: Built with a rugged knurled body and corrosion-resistant materials to withstand daily shop use and provide a secure grip during repeated checks.

This gauge helps streamline quality control by delivering quick, reliable assessments of threaded holes, reducing rework and downtime. By ensuring threads are within spec on the first check, you improve part fit, assembly reliability, and overall production throughput—from engineering labs to the shop floor.