Feature General Tolerance Precision (custom)
Cross‑sectional dimensions (≤50 mm) ±0.3 – 0.5 mm ±0.1 – 0.2 mm
Cross‑sectional dimensions (50–100 mm) ±0.5 – 0.8 mm ±0.2 – 0.4 mm
Wall thickness ±10% of nominal ±5 – 7% of nominal
Twist / bow 0.3 – 1.5 mm per meter 0.2 – 0.5 mm per meter
Length (cut‑to‑size) ±1.5 – 3 mm ±0.5 – 1 mm