Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1643021 found under Clip Spring Tension by Bae Systems Information And Electronic Systems Integration Inc. The National Stock Number assigned to this part is 5340009481200, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1643021.