A square steel bar, also known as a square bar or square rod, is a type of metal bar that has a square cross-section. It is made from steel that has been hot rolled, cold rolled, or forged into a square shape, and is characterized by its strength, durability, and versatility.

Square steel bars are commonly used in a wide range of industrial and construction applications, such as in the manufacturing of machinery, tools, and equipment. They are often used as structural supports in buildings and bridges, as well as in the production of various mechanical components, such as gears, shafts, and fasteners. Square steel bars are also popular in the construction of fences and railings, as they provide a strong and stable frame for these structures.

Square steel bars come in a variety of sizes, thicknesses, and grades, and can be made from different types of steel depending on the specific application. They can be finished with a variety of coatings or plating, such as galvanizing or powder coating, to enhance their resistance to corrosion and wear.