The JBO Thread Plug Gauge is a precision tool for verifying internal threads on metric fine-thread holes. Specifically calibrated for right-hand M38 x 1.5 threads and the 6H tolerance, it provides fast, reliable Go/No-Go checks that confirm components will mate correctly.

Crafted from hardened steel for long life, this plug gauge stands up to daily use in busy shops and laboratories. Its tough construction resists wear and maintains accuracy across many inspections, helping you sustain consistent hole tolerances from part to part.

• Go/No-Go Quick Inspection: Enables fast pass/fail checks of internal threads, reducing inspection time and speeding up setup for mating components.
• Hardened Steel Construction: Built to endure daily use in demanding environments, delivering reliable performance and long-lasting accuracy.
• Right-Hand Metric Fine Thread (M38 x 1.5, 6H): Precisely matched to the M38 x 1.5 specification with 6H tolerance, delivering repeatable, dependable gauging results for quality control and assembly.

Using this gauge helps streamline inspection, minimize rework, and give you confidence that every threaded hole will accept its fastener on the first attempt—supporting consistent, high-quality assembly across your production workflow.