The JBO Thread Plug Gauge is a precision tool designed for metric fine threads. Its Go/No-Go design lets you quickly verify threaded holes and confirm that a mating part will fit cleanly, helping to speed up assembly and reduce guesswork. Built to withstand daily use, this gauge delivers reliable checks that you can trust in busy workshop environments.

This model is tailored for right-hand threads in size M30 x 1.5 with a 4H tolerance, making it an essential for engineers, machinists, and quality inspectors who need dependable, on-the-spot thread verification without guesswork.

• Go/No-Go accuracy for metric fine threads: Quickly determine whether a hole meets spec with a simple pass/fail check, cutting inspection time and rework.
• Dual-ended Go and No-Go testing: One end verifies the minimum acceptable thread and the other end confirms the maximum, delivering definitive results in seconds.
• Hardened steel construction: Designed for durability and long life in demanding shop environments, resisting wear for reliable performance over time.

By using this plug gauge, you streamline threaded-hole verification, improve assembly consistency, and reduce downtime. It provides clear, repeatable results that support better quality control across production runs and service workloads.