Flange width (distance between outer flange edges) varies by height for UPE/UPN channels, ranging from 35 mm (UPE 50/UPN 50) to 140 mm (UPE 400/UPN 400):
UPE Series: Flange width 35–140 mm (e.g., UPE 100: 55 mm, UPE 200: 75 mm).
UPN Series: Flange width 36–140 mm (e.g., UPN 100: 56 mm, UPN 200: 76 mm) (slightly wider than UPE for equivalent height).Flange width directly impacts load distribution-wider flanges reduce lateral buckling risk in long-span applications. EN 10279 specifies flange width tolerances: ±0.8 mm for widths ≤50 mm, ±1.0 mm for 51–100 mm, and ±1.5 mm for >100 mm. These tolerances ensure compatibility with bolts and brackets, preventing load concentration.