This thread plug gauge provides accurate verification of M40 x 2 metric fine internal threads. Machinists, quality inspectors, and assembly teams use it to confirm that threaded holes meet the 4H tolerance before parts move to the next stage of production.

• Go/No-Go Design: Allows fast pass/fail checks on threaded holes so you can approve or reject components without lengthy measurements.
• Hardened Steel Construction: Maintains dimensional accuracy through repeated use and resists wear in demanding shop environments.
• Right-Hand 4H Specification: Matches common metric fine thread standards, delivering consistent results when inspecting M40 x 2 holes.

With reliable thread verification built in, this gauge helps reduce assembly errors, shortens inspection time, and supports tighter quality control across production runs.