The JBO Thread Plug Gauge (GO) is a precision tool designed to verify threaded holes with speed and confidence. Tailored for machinists, quality control teams, and workshop technicians, it helps ensure holes meet the exact M55 x 1.5 metric fine thread size and pitch so assemblies fit correctly.

• Durable hardened steel construction: Built to withstand repeated use in busy workshops, delivering long-lasting wear resistance and consistent inspection results.
• Accurate metric fine threading (M55 x 1.5, 4H): Precisely sized GO gauge that quickly confirms hole threading meets the specified standard, speeding up inspections with reliable outcomes.
• Ergonomic, easy-to-use design: Knurled body and robust end provide secure grip and straightforward insertion in tight spaces, helping reduce inspection time and user fatigue.

Using this gauge supports a smoother quality workflow: you can quickly validate threaded holes, reduce rework, and maintain consistent measurement practices across batches. The rugged construction ensures dependable performance in demanding environments, giving you the confidence to rely on your measurements from first check to final quality sign-off.