The JBO Thread Plug Gauge is a precision inspection tool designed for metric coarse threads. It’s ideal for engineers, machinists, quality teams, and workshop hobbyists who need a fast, reliable way to verify threaded holes before assembly. This right-hand gauge is calibrated for M5 x 0.8 coarse threads (6H tolerance) to ensure consistent, correct fits every time.

Constructed from hardened steel, the gauge resists wear in busy shop environments and delivers long-lasting accuracy. Its compact, knurled body is easy to handle with or without gloves, making field and bench inspections straightforward and repeatable.

• Go/No-Go inspection design: Quickly verify hole tolerance with a practical go check for minimum material and a no-go check for maximum, speeding setup and reducing guesswork.
• Durable hardened steel construction: Built to withstand daily workshop use, resisting wear and maintaining accuracy for long-term reliability.
• Metric coarse thread compatibility (M5 x 0.8, 6H, Right-Hand): Designed specifically for coarse metric threads, ensuring you’re testing the correct size and thread form for reliable fits in production or repair work.

Using this plug gauge streamlines quality control by providing instant answers on hole readiness, which shortens inspection times and improves throughput. The hardened steel construction and clear Go/No-Go function help ensure every fastener and component seats correctly, reducing rework and returns. With standardized M5 x 0.8 checks, you can maintain consistent results across shifts and teams, boosting overall reliability in your manufacturing or repair workflow.