Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 711-1-156-1 found under Backplate Assembly by Simmonds Precision Products Inc. The National Stock Number assigned to this part is 6680010408507, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 711-1-156-1.