The JBO Thread Plug Gauge (NoGo) – Metric Fine – Left Hand – 6H – M55 x 2 is a precision inspection tool designed to verify threaded holes with metric fine threads. It’s built for engineers, machinists, quality control teams, and workshop technicians who need fast, reliable go/no-go checks to confirm hole size and thread fit during production and maintenance.

Crafted for durability, this gauge uses hardened steel construction to resist wear in demanding environments. Its NoGo design enables quick, clear pass/fail determinations, helping you reduce rework and downtime while keeping your production on schedule.

• NoGo design for metric fine threads: Quickly verify hole size by ensuring the plug gauge cannot be inserted past the NoGo limit, helping prevent undersized or oversized threads in critical assemblies.
• Durable hardened steel with knurled grip: Built to withstand daily shop use, the hardened steel resists wear while the textured knurl provides secure, repeatable handling for accurate inspections.
• Left-hand thread compatibility (M55 x 2, 6H): Precisely sized for metric fine left-hand threads, ensuring dependable checks for this specific thread form and tolerance class.

Using the JBO Metric Fine NoGo Thread Plug Gauge streamlines quality inspection, shortens setup time, and maintains consistent thread integrity across batches. The robust construction minimizes downtime from wear, while the precise NoGo limit delivers trustworthy results for left-hand threads (M55 x 2, 6H), helping you produce with confidence.