European EN 10056-1 (Hot-rolled equal and unequal angle sections) defines angle steel dimensions with strict precision, categorizing them into equal angles (both legs have the same length) and unequal angles (legs have different lengths). For equal angles, EN 10056-1 specifies leg lengths (b) ranging from 20mm to 200mm, with corresponding leg thicknesses (t) from 3mm to 24mm. Key examples include:
50x50x5mm: Leg length 50mm, thickness 5mm, weight 3.77 kg/m
100x100x8mm: Leg length 100mm, thickness 8mm, weight 12.20 kg/m
Unequal angles have a "long leg (B) x short leg (b) x thickness (t)" format, with long legs from 30mm to 200mm, short legs from 20mm to 120mm, and thicknesses from 3mm to 20mm. Examples:
75x50x6mm: Long leg 75mm, short leg 50mm, thickness 6mm, weight 7.39 kg/m
150x90x10mm: Long leg 150mm, short leg 90mm, thickness 10mm, weight 18.30 kg/m
EN 10056-1 also specifies dimensional tolerances: ±1% for leg length (up to 100mm leg length) and ±0.5mm for thickness (for thicknesses ≤10mm). Length tolerances are ±5mm for standard lengths (6–12m) and ±10mm for custom lengths (up to 24m). These tolerances ensure compatibility with other structural components (e.g., beams, plates) in European construction projects, where precision is critical for load distribution.