The JBO Thread Plug Gauge is a precision inspection tool designed for metric coarse threads. It enables quick, reliable go/no-go checks of threaded holes to ensure parts will assemble correctly and meet your dimensional standards.

Built for right-hand M3 x 0.5 threads and manufactured to a 4H tolerance, this hardened-steel gauge delivers durable, long-lasting performance in busy workshops and production environments.

• Go/No-Go inspection for fast, confident checks: Quickly determine if thread holes meet the required size and tolerance, reducing guesswork, rework, and production downtime.
• M3 x 0.5 metric coarse threads (Right-Hand) with 4H tolerance: Precisely matched to common coarse-thread components, ensuring consistent fit and reliable results across parts.
• Hardened steel construction for durability: Withstands daily use in demanding settings while maintaining accurate, repeatable measurements over time.

This plug gauge supports streamlined quality control, helping you confirm thread integrity early in the assembly process, improve first-pass acceptance, and preserve overall workflow efficiency with dependable, long-lasting performance.