The JBO Thread Plug Gauge is a precision go/no-go gauge designed for metric coarse threads. This left-hand variant is calibrated for M8 x 1.25 holes, making it ideal for inspection workflows that demand quick, reliable checks of thread fit and hole size. With a simple pass/fail test, you can confirm whether a threaded hole accepts a mating part without over- or under-tapping.

Built for daily shop use, the gauge is machined from hardened steel to resist wear and maintain accuracy even after frequent insertions and extractions. The robust construction helps you reduce downtime and maintain consistent results across lots or batches.

• Go/No-Go design for fast, decisive checks: A quick pass/fail test lets you verify hole size and thread fit in seconds, improving throughput and reducing guesswork.
• Hardened steel construction for durability: Withstand rough handling in busy environments while preserving measurement accuracy over time.
• Left-Hand, M8 x 1.25, 6H tolerance: Specifically calibrated for metric coarse threads, this plug gauge supports inspection of left-handed threaded holes and ensures consistent, repeatable results with standard M8 fasteners.

This combination of accuracy and durability helps you streamline quality checks, reduce rework, and keep production moving. With a reliable gauge at hand, technicians can quickly validate hole readiness, improve part interchangeability, and maintain tight tolerances across assemblies.