The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads, specifically calibrated for M13 x 1 left-hand (LH) holes with a 6H tolerance. It’s ideal for machinists, quality engineers, maintenance technicians, and assembly teams who need fast, reliable go/no-go checks to verify hole readiness and ensure proper mating of components.

• Fast Go/No-Go verification: Quickly confirms whether an M13 x 1 LH hole meets the 6H tolerance, enabling fast pass/fail decisions and reducing inspection time on busy production lines.
• Rugged hardened steel construction: Built to withstand daily use in workshop environments; resists wear and deformation for consistent measurements over time.
• Left-hand metric fine thread precision: Specifically tuned for left-hand M13 x 1 threads, ensuring accurate checks and preventing mix-ups during assembly.

Using this gauge helps you verify thread readiness with confidence, streamline quality control, and reduce rework across machining, assembly, and maintenance tasks. Its durable construction supports reliable performance on the shop floor, delivering consistent results from part to part.