The JBO Thread Plug Gauge (GO) is a precise, easy-to-use tool for inspecting threaded holes with metric fine threads. Designed for professionals across manufacturing, engineering, and quality control, it confirms whether a hole accepts a plug within the required specification, helping you quickly validate part readiness and maintain consistent tolerances.

• Durable hardened steel construction: Built to withstand daily use in busy workshops, resisting wear and corrosion so it stays accurate and reliable over time.
• Precise metric fine GO gauge for left-hand M42 x 3 (6H): Engineered to exacting standards, ensuring correct hole acceptance for left-handed threads and tight 6H tolerance without guesswork.
• Fast, user-friendly inspection: Compact, straightforward design lets technicians insert and verify holes quickly, reducing downtime and speeding quality checks without sacrificing accuracy.

Used correctly in quality control workflows, this GO plug gauge helps you confirm thread engagement, cut down rework, and maintain consistent results across production runs. Its reliable performance supports precise engineering outcomes and builds confidence in every measurement you take.