4x4 galvanized square tubing Return Policy Sino East Steel supply best 4x4 square tube factory with competitive price list, steel tubes for sale are in wide sizes such as from 1/8" to 30" (outer diameter), and wall thickness is about Sch10 to Sch140. A500B GALV; A513-1 GALV; All A513 Type 1 galvanized steel square tubing is produced from 1008-1015 steel. It also can be left exposed. 27 Square tube is a hollow, square-shaped structural material commonly made from metals like steel, stainless steel, or aluminum. Choose from our selection of square tubing connectors, including over 80 products in a wide range of styles and sizes. x 4 ft. (419) 729-9756 Toll Free at 1 (800) 888-2013 Typical Applications. Galvanized steel tube is compliant with ASTM A500 specifications. The more commonly used square tube specifications are: 1 inch/ 2 inch steel square tube/ 3×3/ 4×4 inch steel square tube/ 1. HSS Tube is characterized by the outside dimensions and the thickness of the wall. mrxadeypemokjbulnlogfehjisizkxvplhijgdqzerzicuuabjbaqahqotuwkovqjuglryfogutipfjyke