The JBO Thread Plug Gauge is a precision inspection tool designed to verify internal UNF threads quickly and reliably. It targets left-hand 3/4-16 LH threads, providing a clear go/no-go check to confirm hole conformity and proper mating with fasteners.

Ideal for manufacturing, automotive, and aerospace environments, it helps technicians, inspectors, and machinists ensure threads meet the 2B tolerance class with consistent results.

• Go/No-Go design for fast conformity checks: Quickly verify whether internal threads meet the UNF 3/4-16 LH specification without guesswork, saving inspection time and reducing rework.
• Left-hand UNF 3/4 x 16 with 2B tolerance: Precisely matches LH threads and tolerance class, ensuring correct fitment and preventing mis-mating components.
• Durable, user-friendly construction: Knurled body provides a secure grip, robust ends withstand repeated use, and a corrosion-resistant finish stands up to busy shop floors.

This plug gauge streamlines quality control by delivering straightforward go/no-go feedback, enabling faster setup, fewer rejects, and more consistent assembly results across production runs. Its compact, durable design makes it a reliable addition to any QC toolbox, giving you confidence in every threaded fit.