Þykkt vefs (lóðréttir hlutar sem tengir flansar) er mismunandi eftir hæð, allt frá 3,0 mm (UPE 50/UPN 50) til 14,0 mm (UPE 400/UPN 400):
UPE röð: Vefþykkt 3,0–14,0 mm (td UPE 100: 5,0 mm, UPE 300: 10,0 mm).
UPN röð: Vefþykkt 3,0–14,0 mm (td UPN 100: 5,5 mm, UPN 300: 10,5 mm) (örlítið þykkari en UPE fyrir samsvarandi hæð).
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. Þessi vikmörk tryggja stöðuga klippuafköst yfir lotur.