The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Built for Right-Hand M1.8 x 0.2 with a 5H tolerance, it helps ensure every threaded hole meets exact spec. It’s an essential accessory for engineers, machinists, quality inspectors, and serious hobbyists who require reliable, repeatable thread checks.

Go/No-Go design lets you quickly confirm whether a hole accepts a bolt within tolerance, enabling faster quality checks and reducing guesswork in assembly and manufacturing.

• Go/No-Go quick verification: Quickly determine if a threaded hole is within spec, speeding inspections and reducing downtime.
• Hardened steel construction: Durable, wear-resistant tooling that withstands daily use in busy workshops, extending tool life.
• Metric fine-thread precision (M1.8 x 0.2, 5H, Right-Hand): Specifically matched to metric fine threads to deliver consistent, reliable Go/No-Go results across parts.

Using the JBO Thread Plug Gauge improves workflow by delivering clear pass/fail feedback during QC and assembly. It helps prevent misfits, reduces rework, and supports consistent results across production runs, giving you confidence in every threaded connection.