The JBO Thread Plug Gauge is a precision inspection tool designed to verify internal metric fine-thread holes. Optimized for M12 x 0.5 with right-hand threading and 4H tolerance, this Go/No-Go gauge helps you confirm thread fit quickly before parts proceed to assembly or final QC.

Constructed from hardened steel for long-lasting wear resistance, it maintains accuracy even in busy workshop environments. The Go/No-Go design lets you perform fast, unambiguous checks—one pass or fail lets you know if a hole is within spec, reducing measurement time and rework.

• Go/No-Go quick checks: Quickly confirm hole tolerance with a simple pass/fail test, speeding up inspections and reducing guesswork.
• Hardened steel durability: The hardened steel construction resists wear, preserving accuracy across hundreds of checks in demanding settings.
• Metric fine-thread compatibility (M12 x 0.5, Right Hand, 4H): Specifically designed for the M12 x 0.5 fine-pitch, right-hand threads with 4H tolerance, ensuring reliable, repeatable measurements.

In practice, this gauge minimizes downtime by delivering dependable results fast, improves first-pass acceptance in manufacturing and assembly, and provides consistent readouts that help you meet tight quality standards. Whether in a machine shop, maintenance facility, or production line, the JBO Thread Plug Gauge gives you confidence that your threaded holes will mate as intended, saving time and reducing scrap.