The JBO Thread Plug Gauge is a precision go/no-go inspection tool designed for metric fine threads. It targets M8 x 1 right-hand threads within a 4H hole tolerance, making it ideal for assembly, quality control, and maintenance work where dependable thread fit matters.

• Go/No-Go quick hole inspection: The Go end should seat in a correctly sized hole to confirm proper thread engagement, while the No-Go end should not fully seat, enabling fast, reliable pass/fail checks that reduce guesswork and rework.
• Metric fine-thread compatibility (M8 x 1, right-hand, 4H): Specifically sized for common fine-thread applications, ensuring accurate checks for mating components and hole tolerances in 4H internal threads.
• Hardened steel construction with knurled grip: Built for long life in busy workshops, with wear-resistant steel and a textured grip that stays secure in hand during testing.

Using the JBO Thread Plug Gauge helps streamline your quality checks, shorten setup times, and improve the consistency of threaded assemblies. By confirming correct hole size before assembly, you reduce trial-fitting, minimize rework, and maintain reliable performance across parts and projects.