JBO Thread Plug Gauge is a precision tool designed for metric coarse threads, specifically M4.5 x 0.75, with a right-hand configuration and 6H tolerance. This go/no-go gauge helps you quickly verify threaded holes match the intended size, ensuring reliable fit and function in assemblies. Designed with two precision-threaded ends for simultaneous go and no-go checks. Built to endure daily workshop use, it combines a sturdy hardened steel construction with a comfortable knurled grip for steady handling, even when wearing gloves.

• Go/No-Go design for fast, reliable checks: Quickly determine if a hole is within spec by testing both the go and no-go conditions, reducing inspection time and rework.
• Durable hardened steel with easy handling: Hardened steel resists wear and maintains accuracy over thousands of uses; knurled body provides a secure grip in busy work environments.
• Metric coarse standard — M4.5 x 0.75, 6H, right-hand: Precisely calibrated for common metric threads, ensuring consistent results across parts and suppliers, compatible with standard machined holes.

Used in quality control, manufacturing, and repair operations, this plug gauge helps you confirm hole sizes quickly, protect assembly integrity, and keep production flowing. With its robust construction and straightforward use, you can trust it to deliver repeatable results, supporting tighter tolerances and better overall performance.