Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21B1070 found under Terminal Feedthru by M C L Inc. The National Stock Number assigned to this part is 5940010821380, 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 21B1070.