The JBO Thread Plug Gauge is a precision inspection tool engineered for metric coarse threads. It’s specifically matched to M3.5 x 0.6 coarse threads, making it ideal for engineers, machinists, quality inspectors, buyers, tradespeople, and hobbyists who need fast, reliable hole checks and consistent thread verification.

With a Go/No-Go design, this gauge delivers quick pass/fail assessments of threaded holes, helping you confirm fits and reduce the risk of misassembled parts. The left-hand configuration aligns with your specific threading needs, while the hardened steel construction and knurled grip provide lasting durability and confident handling in busy workshops.

• Go/No-Go design: Provides a fast, clear pass/fail check of threaded holes, enabling quick verification of thread acceptance and reducing inspection time.
• Metric coarse thread compatibility: Precisely matched to M3.5 x 0.6 coarse threads to ensure consistent, reliable inspection results.
• Hardened steel construction with knurled grip: Built to withstand daily use in demanding environments; the knurled surface ensures a secure, repeatable grip and is designed for left-hand threading applications.

Using the JBO Thread Plug Gauge helps you speed up inspections, cut downtime, and ensure every hole meets your exact spec. With straightforward go/no-go checks and durable construction, you gain confidence that parts will assemble correctly, reduce costly rework, and maintain consistent results across assemblies and shift teams.