Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28729 found under Beam Structural by Ryerson Joseph T And Son Inc. The National Stock Number assigned to this part is 9540010141300, and the Federal Supply Class is 9540 Structural Shapes Nonferrous Base Metal. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28729.