3-1/2" x 3-1/2" Hot Rolled Steel Square Tube with a 0.250" wall, supplied in 20-foot lengths. This structural tubing conforms to ASTM A500 Grade B, providing a minimum yield strength of 46,000 PSI and excellent weldability. Its large profile and robust wall thickness make it ideal for heavy-duty structural applications like building frames, supports, and industrial equipment bases. In stock for Los Angeles pickup.