Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4F21015-142B found under Floor Aircraft by Lbz L L C. The National Stock Number assigned to this part is 1560004012322, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4F21015-142B.