Tiús Gréasáin - Athraíonn tiús na rannóige lárnacha ingearacha a nascann an dá flange - de réir airde do chruach cainéal S355JR, le raonta tipiciúla ó 3.0 mm (U50) go 14.0 mm (U400). I measc na samplaí tá:
Bealaí beaga: U50x37x4.5 (tiús gréasáin 4.5 mm), U70x45x5 (tiús gréasáin 5.0 mm)
Bealaí meánacha: U120x53x5.5 (5.5 mm tiús gréasáin), U200x73x7 (tiús gréasáin 7.0 mm)
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. Cinntíonn na lamháltais seo gur féidir leis an ngréasán fórsaí lomadh a aistriú go hiontaofa idir na flanges, rud a choisceann teip roimh am.