The JBO Thread Plug Gauge is a precision tool designed to verify internal metric coarse threads with confidence. It’s the go-to choice for machinists, inspectors, and assembly teams who need quick, standardized checks of threaded holes.

Sized for M27 x 3 right-hand threads and built to endure regular shop use, this gauge combines a go/no-go design with hardened steel construction for reliable, consistent performance over time.

• Fast Go/No-Go Verification: Quickly confirm whether the threaded hole falls within tolerance, speeding setup and reducing inspection time without sacrificing accuracy.
• Accurate M27 x 3 Right-Hand Threads (6H): Precisely matched to standard metric coarse threading, ensuring reliable fitment for mating parts and assemblies.
• Hardened Steel Durability: Built to withstand demanding use in busy workshops, maintaining accuracy and extending tool life through repeated inspections.

This gauge helps you streamline quality control, shorten downtime, and ensure consistent thread engagement across components, so assemblies go together smoothly and reliably every time.