Netttykkelse - Tykkelsen på den vertikale sentrale seksjonen som forbinder de to flensene - varierer etter høyde for S355JR -kanalstål, med typiske områder fra 3,0 mm (U50) til 14,0 mm (U400). Eksempler inkluderer:
Små kanaler: U50x37x4.5 (4,5 mm webtykkelse), U70x45x5 (5,0 mm webtykkelse)
Medium kanaler: U120x53x5.5 (5,5 mm webtykkelse), U200x73x7 (7,0 mm webtykkelse)
Large channels: U300x90x10 (10.0 mm web thickness), U400x140x14 (14.0 mm web thickness)The web's primary role is to resist shear forces- lateral forces acting parallel to the channel's cross-section (e.g., wind loads, seismic activity). Thicker webs provide higher shear capacity, making them suitable for short-span channels supporting heavy loads. Thinner webs are used in long-span applications where bending (not shear) is the primary load, as they reduce weight without compromising bending strength. EN 10025-2:2004 specifies web thickness tolerances: ±0.4 mm for thicknesses ≤5 mm, ±0.5 mm for 5.1–10 mm, and ±0.6 mm for >10 mm. Disse toleransene sikrer at nettet kan overføre skjærkrefter pålitelig mellom flensene og forhindre for tidlig svikt.