The JBO Thread Plug Gauge is a precision tool designed specifically for metric fine threads, namely M28 x 2. It features a right-hand 6G tolerance and a Go/No-Go design that makes hole-thread inspection fast and reliable.
This gauge is ideal for engineers, machinists, quality teams, buyers, tradespeople, and hobbyists who require consistent, accurate internal-thread checks.

• Go/No-Go design for fast validation: Quickly confirm whether the hole thread falls within the specified tolerance, reducing inspection time and rework.
• Specifically for M28 x 2 metric fine threads: Engineered to precisely fit the target thread size, helping ensure consistent, reliable assemblies.
• Durable hardened steel construction: Built to withstand daily use, resist wear, and maintain accuracy over many measurements.

Using this gauge helps you speed up setup and inspections, reduce guesswork, and improve overall thread accuracy in your projects. The Go/No-Go method gives clear, actionable results, so assemblies go together smoothly and consistently. With its durable, hardened-steel construction, the gauge stays reliable through frequent use in workshops, shops, and production lines.