The 41x41 C profile is the standard main carrier rail and purlin section for solar plant structures. Section: A 41 mm base, B 41 mm web, C 10 mm lip. Thickness 1.5–2.5 mm; pregalvanized weight 1.52 kg/m at 1.50 mm, 1.98 kg/m at 2.00 mm and 2.42 kg/m at 2.50 mm. Moments Ix 2.85 cm⁴, Iy 3.92 cm⁴. Grades S250GD, S350GD, DX51D; coatings TS EN 10346 and TS EN ISO 1461. 11x25 mm CNC oval slots at 50 mm pitch. Stock lengths 3 m, 4.2 m, 6 m, 6.2 m; cut-to-length 1,000–12,000 mm. Used with mid/end clamps and hammer-head bolts on rooftop rails and ground-mount purlins.