The JBO Thread Plug Gauge is a precision inspection tool designed for metric coarse threads, helping you quickly verify threaded holes for proper fitment. It’s ideal for machining shops, manufacturers, and QA teams that need fast, reliable checks.
Right Hand operation and compatibility with M4 x 0.7 coarse threads in the 6G class ensure consistent results across parts and standard components, making setup predictable and repeatable.

• Go/No-Go quick validation: Instantly confirms whether a threaded hole meets the M4 x 0.7 coarse thread specification, enabling fast decisions on fit and assembly.
• Hardened steel durability: Built to withstand daily use in busy workshops, resisting wear to maintain accuracy through thousands of inspections.
• Metric coarse thread precision (6G, right hand): Machined to tight tolerances for repeatable, reliable checks that support standardization and quality control across parts.

Using this gauge reduces inspection time, minimizes guesswork during assembly, and helps prevent mismatched components. Its durable construction and precise metric threading give you consistent results, smoother workflows, and greater confidence in part interchangeability across your production line.