Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2 IN. SQ-1 4 IN. WALL THICKNESS found under Tube Metallic by Ryerson Joseph T And Son Inc. The National Stock Number assigned to this part is 4710010565456, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2 IN. SQ-1 4 IN. WALL THICKNESS.