Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D99-4140 found under Spring Motor Actuating by Hayes Diversified Technologies Inc. The National Stock Number assigned to this part is 5360015474133, 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 D99-4140.