Steel square. The steel square is a tool used in carpentry. Carpenters use various tools to lay out structures that are square (that is, built at accurately measured right angles), many of which are made of steel, but the name steel square refers to a specific long-armed square that has additional uses for measurement, especially of various angles.
Structural tubing is a hollow pipe commonly constructed of steel. Manufacturers purchase hot rolled metal coils from mills in order to form the various shapes needed for structural pipe.
We carry square metal tubing in aluminum, brass, carbon steel, hot rolled steel, and stainless steel. Square metal tube stock is used in both structural and architectural applications. Versatility and strength are the key positives of square tubing for sale. Whether you're looking for popular sizes like 2x2 square tubing or 1-inch square tubing ...
The most common (and probably cheapest) square structural tubing is made from A36 carbon steel with a maximum yield stress of 36,000 psi.