This JBO thread plug gauge is built for checking M17 x 1 metric fine threads in a left-hand configuration. It supports machinists, inspectors, and quality teams who need to confirm that internal threads meet the required 6H tolerance before parts are assembled, helping avoid fit issues in precision work.

• Go/No-Go Efficiency: The dual-ended design lets you verify thread acceptance in seconds, reducing inspection time on every hole.
• Hardened Steel Construction: Resists wear from daily use, keeping the gauge accurate across many checks without frequent replacement.
• Left-Hand Thread Specificity: Matches left-hand metric fine threads exactly, ensuring reliable results where standard right-hand gauges cannot be used.

By catching thread deviations early, this gauge helps prevent assembly problems, supports consistent part quality, and keeps production moving without unexpected rework.