The JBO Thread Plug Gauge is a precision tool designed to verify UNF threaded holes with quick, reliable Go/No-Go checks. Sized for the UNF 1/4 x 28, Right Hand, 3B internal threads, it’s ideal for manufacturing, automotive, and aerospace environments where consistent thread quality matters.

Its two-ended design lets you test both the minimum and maximum limits of your threaded hole, delivering clear pass/fail results that keep production moving and help prevent misfits in assemblies.

• Go/No-Go Quick Verification: Quickly determine whether a hole meets the UNF 1/4 x 28, 3B standard with a simple pass or fail reading, reducing inspection time and rework.
• UNF 1/4 x 28 Right-Hand, 3B Internal Thread: Precisely matched to standard UNF threads, providing reliable, repeatable tests across batches and ensuring compatibility with intended parts.
• Durable, Easy-Handling Design: Knurled, sturdy body and smooth ends withstand daily use in busy shops, offering secure grip and long service life for consistent measurements.

By using this gauge, you streamline setup, shorten inspection cycles, and improve overall quality control. It helps you deliver accurate thread measurements every time, reduce downtime, and keep your workflows aligned with strict manufacturing standards.