Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 820-4385076 AND 820-43850 found under Spring Wave by Associated Spring Barnes Group Inc. The National Stock Number assigned to this part is 4470002014642, 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 820-4385076 AND 820-43850.