The JBO Thread Plug Gauge is a precision tool designed to verify metric fine-thread holes. It is ideal for engineers, machinists, quality teams, and maintenance technicians who need fast, reliable Go/No-Go checks for M30 x 1 right-hand threads in the 4H tolerance class.

Built from hardened steel, it delivers long-lasting performance and resistance to wear in daily shop use.

• Go/No-Go quick checks: Quickly confirm whether an M30 x 1 right-hand threaded hole meets the 4H tolerance, reducing setup time and guesswork in quality inspections.
• Hardened steel construction: Withstands daily wear, maintaining accuracy and delivering consistent results across many uses.
• Metric fine-thread compatibility: Specifically designed for metric fine threads, ensuring true size engagement and reliable mating with corresponding parts.

Using this gauge on your parts and assemblies helps speed up inspection and fit processes, minimize rework, and improve overall assembly reliability. The Go/No-Go design provides clear pass/fail signals, so operators can work with confidence. The durable construction ensures dependable performance long after purchase, making it a practical addition to any quality control or manufacturing toolkit.