Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A040022021 found under Spring by Dk Manufacturing Llc. The National Stock Number assigned to this part is 5360012382985, 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 A040022021.