The JBO Thread Plug Gauge is a precision inspection tool for metric coarse threads. Built for shops, manufacturers, and quality-control teams, it helps verify threaded holes meet standard M36 x 4 specifications and 6H tolerance.

With a Go/No-Go design and a right-hand thread orientation, you can quickly confirm whether a bore accepts a mating thread and identify any out-of-tolerance conditions before assembly.

• Go/No-Go verification for fast, reliable checks: a simple pass/fail test on each bore lets you confirm proper size and tolerance at a glance, reducing inspection time and rework.
• Durable hardened steel construction: built to withstand daily use in busy workshops, resisting wear and maintaining accuracy through long service life.
• Right-hand metric coarse thread standard (M36 x 4, 6H): aligns with common production threads, ensuring consistent fit and interchangeability with other gauge tools and components.

This plug gauge streamlines quality control by delivering repeatable, confident thread verification, speeding up setup, and ensuring assemblies thread smoothly batch after batch. Its robust construction and clear go/no-go results help you maintain consistent performance across production runs, reducing downtime and delivering reliable results every time.