The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine-thread holes. Built for engineers, machinists, quality-control professionals, and serious hobbyists, it helps confirm hole size and thread fit with a quick, simple go/no-go check.

Designed for right-hand M34 x 0.5 threads, this Go/No-Go gauge delivers fast, decisive checks in production or on the bench. Constructed from hardened steel for long-lasting wear resistance, it features a knurled grip for secure handling even with gloves and in demanding workshop conditions.

• Dual-ended Go/No-Go design: Enables immediate pass/fail checks in a single action, speeding inspection and reducing guesswork.
• Hardened steel body with knurled grip: Delivers durable, wear-resistant performance and secure handling through busy shifts and repetitive use.
• Precise M34 x 0.5, 6H right-hand threads: Sized for standard metric threads with tight tolerance to ensure consistent measurements across parts.

By using this gauge, you can accelerate QA workflows, minimize rework due to incorrect threading, and improve fit reliability across assemblies. The robust construction supports long service life in workshop environments, making it a dependable addition to any toolkit that handles precision threads.