The JBO Thread Plug Gauge is a right-hand, metric fine Go/No-Go gauge designed for M18 x 0.5 threads with a 6H tolerance. It’s ideal for engineers, machinists, quality inspectors, and hobbyists who need fast, reliable checks to confirm that threaded holes will accept mating parts without guesswork.

• Go/No-Go design for fast verification: Instantly determine whether a threaded hole is within tolerance, reducing inspection time and preventing incorrect assemblies.
• Hardened steel for lasting durability: Built to endure daily shop use, resisting wear so accuracy stays consistent over time.
• M18 x 0.5 fine thread, 6H tolerance: Precisely matched to the target thread class, delivering repeatable checks of internal threads for reliable mating with fasteners.

Use this gauge to speed up quality control, ensure consistent results across parts and operators, and minimize downtime by catching out-of-tolerance holes before assembly. Its durable construction provides long-term value, giving you confidence in every threaded check.