The JBO Thread Plug Gauge is a precision Go-No-Go gauge designed for validating left-hand UNEF threads in 3/4 x 20 threaded holes. With a 2B tolerance designation, it provides fast, reliable pass/fail checks that help ensure components assemble correctly and consistently in manufacturing, automotive, and aerospace settings.

• Go/No-Go End Design: Two precise ends deliver quick, decisive checks—the go end should fit cleanly, while the no-go end must not, enabling rapid quality confirmation without guessing.
• Left-Hand UNEF 3/4 x 20, 2B Tolerance: Specifically matched to left-hand threads in this size, ensuring accurate inspection and reducing rework on critical parts.
• Durable, Easy-Handling Construction: Knurled body with color-coded end rings for fast orientation and secure handling in busy work environments, delivering repeatable results across batches.

Using this gauge streamlines inspection, minimizes downtime, and helps ensure fasteners and threaded components fit correctly from the first assembly. It supports consistent quality, boosts workflow efficiency, and provides confidence in every threaded hole you verify.