The JBO Thread Plug Gauge is a precision inspection tool designed to verify internal threads quickly and reliably. It is calibrated for 5/16 x 24 right-hand UNJF 3B threads, making it ideal for ensuring threaded holes and mating components meet exact specifications.

With a go/no-go design, inspectors and machinists can identify non-conforming threads at a glance, reducing guesswork and minimizing rework. Built for daily use in manufacturing, automotive, and aerospace environments, this gauge delivers consistent results where accuracy matters most.

• Go/No-Go Quick Check: Instantly confirm whether internal threads meet the UNJF 3B tolerance for 5/16 x 24 right-hand threads, speeding quality checks and reducing guesswork.
• Durable, Comfortable Handling: Solid construction with a knurled grip and a corrosion-resistant finish withstands everyday shop use and repeated insertions, preserving accuracy over time.
• Precise, Standardized Size: Specifically matched to 5/16 x 24 UNJF 3B internal threads, delivering reliable, repeatable measurements for consistent part mating.

Using the JBO Thread Plug Gauge streamlines your quality workflow by delivering immediate pass/fail results, limiting guesswork, and accelerating inspection cycles. The durable construction and standardized UNJF 3B sizing ensure dependable measurements across shifts and tools, helping you tighten tolerances, reduce downtime, and improve overall part quality and throughput.