Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST0431521HS0006 found under Angle Structural by Hi Shear Corporation. The National Stock Number assigned to this part is 9540004635826, 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 ST0431521HS0006.