The JBO Thread Plug Gauge is a precise go-no-go inspection tool designed to verify internal threads in electrical conduit fittings and similar threaded holes. It’s ideal for engineers, inspectors, technicians, and hobbyists who Need fast, reliable checks to confirm threads meet specifications.

• Go-No/Go design for quick conformance checks: Instantly determine whether the internal thread hole meets the required tolerance, reducing guesswork and speeding up quality assurance on the shop floor.
• Right Hand, M40 x 1.5 compatibility: Specifically shaped for common electrical conduit threads, ensuring correct engagement and accurate results for your standard fittings.
• 7H tolerance for precise, repeatable measurements: Engineered to the 7H internal-thread standard, delivering consistent results across parts and batches to support reliable fitment every time.

With its precise dimensions and robust construction, this gauge helps you streamline inspection, improve first-pass acceptance, and minimize downtime during assembly and maintenance workflows. It provides confidence in every measurement, so you can rely on your conduit fittings and threaded components to perform as intended.