Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31543 found under Beam Structural by Aluminum Co Of America. The National Stock Number assigned to this part is 9540001674350, 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 31543.