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What Are Standard CNC Machining Tolerances?

What Are Standard CNC Machining Tolerances?

March 17, 2026

Standard machining tolerances typically range from ±0.005 inches (±0.127 mm) for metals to ±0.010 inches (±0.254 mm) for plastics. Tighter tolerances—down to ±0.001 inches (±0.025 mm) or finer—are achievable with advanced equipment and process control. Factors like material stability, part geometry, and temperature can affect achievable tolerances. We recommend specifying critical tolerances on your drawing and consulting our engineering team to balance precision with cost efficiency.


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