Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31161-1640 found under Spring Helical Comp by Lucas Aerospace Power Equipment. The National Stock Number assigned to this part is 5360004200912, and the Federal Supply Class is 5360 Coil Flat Leaf And Wire Springs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 31161-1640.