The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads, specifically calibrated for M5 x 0.25 holes. With Right Hand orientation and a 6H class, it’s ideal for engineers, machinists, buyers, and quality teams that demand exact, repeatable hole checks.

With a Go/No-Go design, this gauge enables quick verification of threaded holes, ensuring parts assemble reliably and reducing the need for rework. The hardened steel construction delivers long-lasting performance and wear resistance, helping you maintain accuracy through busy production runs.

• Go/No-Go design for fast hole validation: Quickly determine whether a threaded hole meets spec, cutting inspection time and reducing misfits.
• Right Hand, metric 6H compatibility: Designed to match standard metric fine-thread holes and right‑hand threads for consistent, repeatable checks.
• Hardened steel construction with durable grip: Built to resist wear and provide secure handling, ensuring long-term accuracy across many inspections.

This plug gauge supports smooth, efficient quality control and helps you achieve reliable fit and performance in assemblies. Its robust construction and precise design translate to fewer delays, faster setups, and greater confidence in every measurement.