Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3F20 4 found under Filter Assembly Ele by Crydom Corp. The National Stock Number assigned to this part is 5915016269853, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3F20 4.