Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 540021-009 found under Terminal Feedthru by Bae Systems Information And Electronic Systems Integration Inc Div Bae Systems. The National Stock Number assigned to this part is 5940006834671, and the Federal Supply Class is 5940 Lugs Terminals And Terminal Strips. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 540021-009.