Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BAC1503 4203 found under Angle Structural by Boeing Aircraft. The National Stock Number assigned to this part is 9540001454559, 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 BAC1503 4203.