U channel steel can be bought in various standard dimensions, usually between 1.5 to 12 inches in depth and the flange widths and thicknesses go hand in hand with the widths. The measurements are standardized so that they can work together with other frames. Commonly used dimension sizes are 3x2x1/4, 4x3x1/4, and 6x4x1/2 in making steel and construction. The measurement that needs to be used is entirely dependent upon the load requirement and the specification of the projects hence receiving the incorrect width and length can be very detrimental so it is wise for the clients to talk to the experts before buying it.