The Asimeto 682 Series Plug Gauge is a precision tool crafted to verify the internal threads of metric fine fasteners with reliability and speed. Designed for machinists, quality control professionals, and maintenance teams, it provides dependable go/no-go checks on M40 x 3 threads in the 6H class.

• Series: 682 Series plug gauge for metric internal threads
• Thread size: M40 x 3 (internal thread diameter and pitch)
• Tolerance class: 6H, ensuring accurate pitch diameter checks in metric threads
• Handedness: Right-hand thread gauge
• Purpose: Precise measurement of the thread pitch diameter to verify mating quality
• Construction: High‑quality steel with a knurled central body for secure handling and repeatable measurements
• Finish and accuracy: Ground and inspected to tight tolerances to support consistent results
• Applications: Ideal for production QC, assembly verification, and routine maintenance checks on metric fasteners

Using this gauge, you can quickly determine whether an internal thread meets specification. The go/no-go design helps you confirm proper thread engagement and avoid cross‑threading, inspection delays, or mismatched fasteners. Built for longevity in busy workshops, the 682 Series gauge maintains precision across repeated use, reducing the need for frequent recalibration and enabling smoother, more reliable assembly workflows.