The JBO Thread Plug Gauge is a precision inspection tool built for metric fine threads. It helps quality teams, engineers, and shop floor technicians quickly verify hole acceptance during assembly, reducing misfits and rework.

This left-hand gauge is sized for M3 x 0.35 threads and conforms to 6H tolerance, offering durable, repeatable performance. Crafted from hardened steel, it resists wear and maintains accuracy through rigorous daily use.

• Precise metric fine-thread fit (M3 x 0.35): Designed to match the M3 x 0.35 thread form, enabling reliable Go/No-Go checks and ensuring holes accept mating parts as intended.
• Go/No-Go quick checks: The dual-ended design lets you perform fast go/no-go tests, speeding up inspection without guessing.
• Durable hardened steel construction: Built to endure daily shop use, resisting wear and maintaining accuracy over time.

By using this gauge, you can streamline threading inspections, reduce assembly delays, and improve overall quality. The Go/No-Go design provides clear pass/fail feedback, while its hardened steel body ensures long service life—keeping your measurement process consistent and dependable.