The JBO Thread Plug Gauge is a precision inspection tool designed for professionals who need fast, reliable verification of UNF threaded holes. It’s purpose-built for left-hand threads and is calibrated to 9/16 x 18 UNF with a 2B class fit, helping ensure threads meet exact standards every time. Ideal for manufacturers, automotive shops, and aerospace quality teams, this gauge delivers clear pass/fail results at a glance.

Two ends provide dedicated go and no-go checks, allowing you to confirm acceptance or rejection in a single measurement. The gauge features a rugged knurled body for a secure grip and color-coded end bands to differentiate the test ends, enabling quick, accurate use even in busy or cramped work environments.

• Two-ended Go/No-Go design: delivers rapid conformance checks for both the minimum and maximum thread limits, speeding up inspections and reducing rework.
• UNF 9/16 x 18 Left-Hand, 2B calibration: ensures precise, standards-compliant assessment of LH threads for reliable fitment.
• Rugged, easy-to-handle construction: knurled body with color-coded ends provides durable, slip-resistant use and quick end identification in demanding settings.

Use the JBO Thread Plug Gauge to streamline quality control, improve workflow consistency, and ensure threaded components perform as intended with confidence and repeatable results.