The JBO Thread Plug Gauge is a precision inspection tool built for metric fine threads. It’s ideal for machinists, engineers, quality teams, and assembly technicians who need fast, reliable checks to confirm that threaded holes match the M16 x 1 left-hand specification. Use it during setup, first article inspections, or routine quality control to ensure components fit together smoothly.

Designed for durable, repeatable performance, this gauge features hardened steel construction that stands up to daily workshop use and resists wear over thousands of inspections. The Go/No-Go design lets you confirm acceptability at a glance, helping you maintain tight tolerances without guesswork.

• Go/No-Go quick checks: Inspect threaded holes in seconds with a simple pass/fail indication, reducing downtime and rework in production or repair environments.
• Metric fine-thread compatibility – M16 x 1 (Left-Hand): Precisely gauges internal left-hand threads to ensure correct fit and consistent mating with corresponding parts.
• Hardened steel construction: Built for long life, resisting wear and maintaining accuracy even in dirty or demanding shop conditions.

Using the JBO Thread Plug Gauge helps streamline your measurement workflow, speeds up setup, and delivers confidence that threaded assemblies will thread consistently on the first try.