Debljina mreže (prirubnice za povezivanje okomitog presjeka) varira po visini, u rasponu od 3,0 mm (UPE 50/UPN 50) do 14,0 mm (UPE 400/UPN 400):
UPE serija: Debljina mreže 3,0–14,0 mm (npr. UPE 100: 5,0 mm, UPE 300: 10,0 mm).
UPN serija: Debljina mreže 3,0–14,0 mm (npr. UPN 100: 5,5 mm, UPN 300: 10,5 mm) (nešto deblji od UPE za ekvivalentnu visinu).
The web resists shear forces (e.g., wind, seismic loads)-thicker webs handle higher shear, making UPN 400 or UPE 400 suitable for heavy-industrial applications (e.g., crane supports). EN 10279 specifies web thickness tolerances: ±0.4 mm for ≤5 mm, ±0.5 mm for 5.1–10 mm, and ±0.6 mm for >10 mm. Ove tolerancije osiguravaju konzistentan učinak smicanja u serijama.