The JBO Thread Plug Gauge is a precise, dual-ended instrument designed for quick, reliable verification of UNC threads. Built for left-hand threads in a 1-8 size with 2B tolerance, this Go/No-Go gauge is an essential tool for inspectors, machinists, and quality teams across manufacturing, automotive, and aerospace environments. Its straightforward design lets you confirm holes conform to unified threading standards with confidence.

• Dual-ended Go/No-Go design: quickly distinguish conforming from non-conforming threads in a single check, speeding up inspection and reducing guesswork.
• Precisely sized for UNC 1-8 Left-Hand threads (2B): delivers consistent measurements that support proper fitment and reliable results across parts and assemblies.
• Ergonomic, knurled construction: the textured grip provides secure handling in busy workshops, improving control and reducing slips during use.

Used correctly, this gauge streamlines your inspection workflow, lowers downtime, and helps maintain tight quality standards. It supports standard thread inspection procedures and provides clear, repeatable results that you can trust when certifying parts for production, maintenance, or repair applications.