Angle steel is available in both equal - angle (with two legs of the same length) and unequal - angle (with different leg lengths) configurations. For equal - angle steel, common size ranges for leg lengths span from 20 mm × 20 mm (0.8 in × 0.8 in) to 200 mm × 200 mm (8 in × 8 in), with thicknesses from 3 mm (0.12 in) to 25 mm (1 in). For example, a typical small equal - angle is 50 mm × 50 mm × 5 mm (2 in × 2 in × 0.2 in), suitable for light - duty framing, while a large industrial - grade equal - angle might be 150 mm × 150 mm × 12 mm (6 in × 6 in × 0.5 in), used in heavy structural bracing.
Unequal - angle steel features leg lengths such as 30 mm × 20 mm (1.2 in × 0.8 in) up to 150 mm × 100 mm (6 in × 4 in), with thicknesses from 4 mm (0.16 in) to 16 mm (0.63 in). An example is the 75 mm × 50 mm × 6 mm (3 in × 2 in × 0.25 in) unequal - angle, ideal for brackets requiring directional strength. These size variations enable engineers to select angle steel that optimizes load - bearing capacity while minimizing material waste, whether for residential fencing or industrial machinery supports.