JBO Thread Plug Gauge - Metric Coarse Go/No-Go - Right Hand - 6G - M39 x 4 is a precision inspection tool designed to verify internal threads in metric coarse sizes. This go/no-go plug gauge helps machinists, quality inspectors, and assembly technicians quickly confirm whether a threaded hole matches the intended M39 x 4 coarse thread, ensuring proper fitment of mating parts.

Constructed from hardened steel and engineered for durability, this gauge withstands routine shop use and repeated inspections. The right-hand orientation and 6G sizing support reliable checks across standard metric holes, delivering consistent performance over time.

• Go/No-Go verification: Provides clear pass/fail indications for threaded holes, enabling fast, repeatable checks and reducing guesswork during assembly.
• Hardened steel construction: Built to resist wear and maintain accuracy through frequent use in busy workshops and production environments.
• Size-specific for M39 x 4 coarse threads: Precisely matched to the M39 x 4 coarse thread standard, ensuring reliable measurements and consistent results for metric holes.

This gauge helps streamline quality control, shorten setup times, and improve overall thread integrity across machining, assembly, and maintenance tasks. Rely on its robust construction and targeted sizing to deliver dependable results with every inspection.