The JBO Thread Plug Gauge (NoGo) – Metric Fine LH, 6H, M42 x 3 is a precision NoGo plug gauge tailored for metric fine threads. This left-hand (LH) version is designed to check internal threads in LH-hole applications, with a nominal M42 x 3 size and 6H internal tolerance to ensure reliable, repeatable inspections.

• Metric Fine Thread Precision (M42 x 3, 6H): Specifically engineered for metric fine threads, enabling fast, accurate NoGo checks of hole size to meet standard specifications.
• Left-Hand Thread Compatible: Built for left-hand threaded holes, allowing correct gauging without swapping tools or setups.
• Hardened Steel Durability: Crafted from hardened steel for long wear resistance in busy workshop environments, preserving accuracy over time.

Designed to support quality control across manufacturing, maintenance, and assembly workflows, this gauge helps you verify hole tolerances quickly and confidently. Its robust construction minimizes downtime, reduces rework, and provides consistent results, making it a dependable choice for reliable LH-thread hole inspections at the M42 x 3 size with 6H tolerance.