Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4X13168Z found under Cylinder Compressed Gas Air Tech by United States Steel Corporation. The National Stock Number assigned to this part is 8120001481042, and the Federal Supply Class is 8120 Commercial And Industrial Gas Cylinders. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4X13168Z.