The JBO Thread Plug Gauge is a precision inspection tool designed for verifying UNC left-hand thread holes. Use it to quickly check 3/8 x 16 threaded holes in manufacturing, automotive, and aerospace applications, ensuring parts meet documented thread standards. Its go/no-go design provides immediate feedback, helping technicians confirm proper fitment and reduce rework on the shop floor.

• Go/No-Go quick check for UNC left-hand threads: Two ends enable fast pass/fail verification of 3/8 x 16 left-hand UNC holes, delivering clear acceptance or rejection in seconds.
• 1:1, 2B-tolerance precision: Calibrated to the 2B tolerance class for 3/8 x 16 left-hand threads, ensuring consistent measurements across parts and production batches.
• Durable, user-friendly design: Rugged gauge body with knurled grip and corrosion-resistant finish withstands daily shop-floor use and easy handling in confined spaces.

Using this gauge streamlines inspection workflows, reduces downtime, and improves overall quality outcomes. The quick go/no-go checks help you verify hole readiness with confidence, while the durable construction supports long service life in demanding environments. Whether validating in-house production or auditing supplier parts, this gauge delivers reliable, repeatable results that keep assemblies fitting correctly and production moving smoothly.