The JBO Thread Plug Gauge (GO) - Metric Fine - Left Hand - 6H - M56 x 1 is a precision go gauge designed to verify threaded holes in metal parts and assemblies. It helps engineers, machinists, quality inspectors, buyers, and hobbyists quickly confirm that threads are produced to spec with a simple, reliable check.

Made from hardened steel, this gauge resists wear in demanding environments and provides long-lasting accuracy. The left-hand, metric-fine M56 x 1 size and the 6H specification ensure consistent hole testing and repeatable results across standard parts, supporting efficient quality control on the shop floor.

• Fast, one-step GO verification: Quickly confirm proper thread engagement with a single check, speeding inspections and reducing downtime for left-hand metric fine threads (M56 x 1).
• Rugged hardened steel construction: Built to endure daily use in busy workshops, resisting wear and maintaining accuracy over time.
• Precise metric fine, 6H specification: Ensures compatibility with standard threaded holes and delivers consistent, repeatable measurements across batches.

With the JBO Thread Plug Gauge GO Metric Fine, you gain a reliable, fast tool that improves inspection efficiency and confidence in every part. It helps reduce rework and rejects by identifying out-of-spec holes early, shortens setup and inspection times, and supports consistent results across production runs. The durable construction and straightforward use make it a dependable addition to any manufacturing, engineering, or workshop quality program.