The JBO Thread Plug Gauge is a precision instrument designed to quickly verify metric fine-threaded holes with confidence. Built for engineers, machinists, quality teams, and shop-floor technicians, this right-hand Go/No-Go gauge targets M3 x 0.25 threads within a 4H tolerance, helping you confirm hole readiness at a glance.

• Go/No-Go inspections for rapid decisions: Quickly determine whether a hole meets the specified M3 x 0.25 thread size and 4H tolerance, reducing guesswork and speeding up assembly or quality checks.
• Durable hardened steel construction: Designed to withstand daily use in busy workshops, resisting wear and maintaining accurate results over time for dependable performance.
• Precisely matched metric fine threads: Specifically cut for right-hand M3 x 0.25 threads with 4H tolerance, ensuring consistent fit with standard components and reliable repeatability across batches.

Using this gauge streamlines your workflow by delivering clear, binary results that auditors and operators can trust. Its compact, robust design fits easily into toolboxes and inspection carts, helping you cut setup time, reduce retries, and achieve consistent, high-quality thread fits in every project.