The JBO Thread Plug Gauge is a purpose-built UNC go-no-go tool designed to verify threaded holes quickly and reliably. With precise dimensions and a straightforward go/no-go design, it helps teams in manufacturing, automotive, and aerospace confidently confirm threads meet Unified standards during quality checks.

This gauge is specifically configured for right-hand threads, 2B class tolerance, and No. 4 x 40 size. Its dual-ended design provides an immediate pass/fail indication, while a textured knurled grip ensures secure handling in busy work environments, making it a dependable reference in any inspection kit.

• Dual-ended Go/No-Go design: Enables fast, clear pass/fail verification of UNC threads, reducing inspection time and avoiding guesswork.
• Right-hand, 2B precision: Delivers consistent, standards-aligned validation of internal threads, helping maintain uniformity across lots.
• No. 4 x 40 UNC size with knurled grip: Fits common hole sizes and offers easy handling in tight spaces, minimizing misreads and setup time.

Using this gauge streamlines your quality workflow by delivering reliable reference checks that prevent mismatches before assembly. It supports faster throughput, reduces rework, and provides confidence that threaded components will fit as intended in critical applications.