The JBO Thread Plug Gauge is a precision tool for inspecting metric fine-threaded holes. Specifically designed for right-hand M28 x 1 threads with a 6H tolerance, this Go/No-Go gauge lets you quickly validate hole quality and ensure a proper fit in critical assemblies.

Constructed from hardened steel, it resists wear and maintains accuracy through frequent use in daily production, QA labs, and maintenance workflows. This makes it a dependable choice for machinists, engineers, and inspectors who need consistent, repeatable results.

• Quick Go/No-Go verification for metric fine threads: Speeds up hole-inspection workflows by instantly confirming whether a thread hole is within tolerance or requires adjustment.
• Hardened steel durability for long life: Built to withstand regular use, resisting wear, corrosion, and deformation to preserve accuracy over time.
• Metric-fine, right-hand threading: M28 x 1, 6H: Precisely matched to standard metric holes, ensuring reliable acceptance checks and compatibility with common machining and inspection setups.

This combination of fast checks, rugged construction, and exacting thread compatibility helps you reduce downtime, cut rework, and achieve consistently reliable results across production runs.