Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99-4027 found under Spring by Donallco Inc. The National Stock Number assigned to this part is 5360008697417, 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 99-4027.