The JBO Thread Plug Gauge is a precision inspection tool designed for metric coarse threads. This left-hand Go/No-Go gauge is built to quickly verify threaded holes to ensure proper fitment of components, specifically for M3 x 0.5 coarse threads, and aligns with 6H tolerance for reliable results. It’s an ideal companion for engineers, machinists, quality technicians, and assembly teams who need fast, dependable hole checks.

Crafted for durability, this gauge uses hardened steel to withstand daily shop use and maintain accuracy over time. The Go/No-Go design lets you perform pass/fail checks at a glance, reducing guesswork and rework while speeding up set-up and inspection processes.

• Go/No-Go design for fast, confident hole checks: instantly determine whether a hole meets the M3 x 0.5 coarse-thread specification, saving time during setup and quality inspection.
• Specifically matched to M3 x 0.5 metric coarse threads: provides reliable, repeatable checks that support consistent assembly and fewer fitting issues in production.
• Hardened steel construction for long-lasting reliability: stands up to daily use in busy environments, preserving accuracy and reducing replacement costs over time.

Use this gauge to streamline your inspection workflow, minimize downtime, and ensure components fit correctly the first time. With its sturdy construction and precise Go/No-Go functionality, you can trust consistent results across parts and batches, helping you achieve higher quality and faster throughput in your manufacturing or maintenance processes.