The JBO Thread Plug Gauge is a precision inspection tool for metric coarse threads, specifically sized M1.1 x 0.25 with a 5H tolerance and designed for left‑hand threads. It helps engineers, machinists, and quality inspectors quickly verify threaded holes and ensure components fit correctly.

Its go/no-go design delivers fast, reliable pass/fail checks, reducing guesswork and rework on your production lines. Crafted from hardened steel, this gauge withstands daily shop-floor use and maintains accuracy over many inspections.

• Go/No-Go Quick Verification: Instant pass/fail checks for M1.1 x 0.25 coarse threads, helping you confirm hole tolerance at a glance and reduce rework.
• Left-Hand Thread Compatibility: Specifically engineered for left-hand metric coarse threads, ensuring you test the correct form and avoid cross-thread mistakes.
• Hardened Steel Durability: Built from hardened steel to resist wear and preserve calibration through heavy use, providing long-lasting reliability.

This gauge helps you streamline inspection, improve fixture quality, and keep assemblies consistent across batches. By validating thread holes quickly and accurately, you can speed up setup, reduce downtime, and ensure dependable performance in every assembly.