The JBO Thread Plug Gauge is a precision inspection tool for internal metric threads, built for right-hand M2 x 0.25 applications and the 4H tolerance class. It’s ideal for machinists, quality inspectors, and maintenance technicians who need fast, accurate hole verification.

Crafted from hardened steel for long-lasting durability, this Go/No-Go gauge lets you quickly confirm whether a threaded hole is within spec—eliminating guesswork during assembly and quality control.

• Go/No-Go design for fast, confident hole checks: Quickly determine if the threaded hole meets spec, reducing inspection time and preventing misfits during assembly.
• Metric fine thread compatibility (M2 x 0.25, 4H): Precisely checks the most common fine-thread size, minimizing guesswork and ensuring consistent results.
• Hardened steel construction for durability: Resists wear in busy workshops and maintains accuracy through repeated use.

Using the JBO Thread Plug Gauge streamlines inspection and assembly workflows. The quick pass/fail checks help you avoid costly rework and ensure every part mates correctly the first time. With its precise sizing, durable construction, and reliable performance, you can trust this gauge for routine maintenance, batch QC, and production environments alike.