The JBO Thread Plug Gauge is a precision tool designed to verify metric coarse threaded holes quickly and accurately. Specifically tailored for M3.5 x 0.6 coarse threads, it helps engineers, machinists, inspectors, and hobbyists confirm that a hole will accept a mating part with the correct fit. The go/no-go design provides a clear, fast indication of acceptance or rejection, simplifying setup and quality checks.

Built for daily workshop use, this plug gauge features a right-hand orientation with 6H tolerance and is crafted from hardened steel to withstand demanding inspection tasks. Its durable construction resists wear, maintains measurement integrity, and delivers reliable performance through thousands of checks.

• Go/No-Go design for fast checks: Quickly determine if the threaded hole meets specification with a clear pass/fail indication, reducing inspection time and guesswork.
• Designed for metric coarse threads (M3.5 x 0.6, Right Hand): Ensures consistent hole sizing and reliable component fit across production runs.
• Hardened steel for durability: Withstands frequent use in busy environments, maintaining accuracy and reducing downtime due to wear.

Used in setup, in-process checks, and final QA, this gauge helps you verify thread quality with confidence—speeding workflows, minimizing rework, and ensuring consistent performance of threaded assemblies from prototype through production.