The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine threads. Specifically crafted for left-hand hole applications, it helps you quickly verify that a threaded hole meets the exact spec for M20 x 1.5 with a 6H tolerance. It’s ideal for engineers, machinists, quality inspectors, and assembly teams who require fast, reliable checks without guesswork.

Constructed for durability in busy workshops, this gauge uses hardened steel to resist wear and stand up to daily use. A textured knurled body provides a secure grip, making repeatable, accurate checks comfortable and effortless across shifts and projects.

• Go/No-Go verification for metric fine threads: Enables fast, deterministic checks of threaded holes, ensuring only parts that meet spec move forward and reducing rework.
• Designed for M20 x 1.5, 6H, left-hand threads: Precisely matched to your critical thread geometry, delivering reliable pass/fail results for left-hand hole tolerances.
• Hardened steel construction with knurled grip: Built to endure daily use, resist wear, and provide a secure, comfortable hold for repeatable measurements.

Using the JBO Thread Plug Gauge shortens inspection cycles, improves setup consistency, and helps you maintain accurate thread engagement across parts. It supports faster QA decisions, reduces downtime, and delivers dependable results that you can trust in every project.