What are the typical height ranges for S355JR channel steel?

S355JR channel steel (designated as "U-profiles" in EN standards) has standard height ranges from 50 mm (U50) to 400 mm (U400). Height-measured as the distance from the top of the web to the bottom of the flange-is a critical dimension for load-bearing capacity. Common sizes include U50x37x4.5 (50 mm height), U100x50x5 (100 mm height), U200x73x7 (200 mm height), and U300x90x10 (300 mm height). EN 10025-2:2004 specifies strict height tolerances: ±1.0 mm for heights ≤100 mm, ±1.5 mm for 101–200 mm, and ±2.0 mm for >200 mm. These tolerances ensure consistent performance across batches and compatibility with prefabricated structural components. For example, a U200x73x7 channel must maintain its 200 mm height to fit into brackets designed for that size, avoiding installation delays or structural weaknesses.